Abstract: N-Substituted cyclic imides are obtained by reacting a cyclic acid anhydride with an amine in the presence of a solvent and an acid catalyst at 80.degree. to 200.degree. C. and with removal of the water formed, it being particularly advantageous to carry out this reaction in the presence of a stabilizer and an inert, dipolar aprotic cosolvent, optionally to add an inert organic solvent of low or zero polarity to the reaction mixture present after the reaction, to add a non-aqueous base in an amount of 0.5 to 50% by weight, based on the cyclic anhydride of the formula (II) used, and to separate off the precipitate formed to give a filtrate containing the N-substituted cyclic imide.

Abstract: A process for preparing N-substituted maleimide is disclosed, which includes reacting maleic anhydride with a primary amine using both a non-polar solvent and a protic polar solvent in the presence of an acid catalyst.

Abstract: The present invention provides a method for preparation of a compound of the formula (I) useful as a fog restrainer for a silver halide light-sensitive material, especially for a heat-developing light-sensitive material and a synthetic intermediate for the fog restrainer. The method makes it possible to obtain the fog restrainer in good yield and in short steps. ##STR1## wherein, R.sup.1 is alkyl, cycloalkyl, or aryl, R.sup.2 and R.sup.3 are hydrogen atom or alkyl, R.sup.4 is hydrogen atom or acyl, and R.sup.1 and R.sup.4 may be bonded together to form 5- or 6-membered ring.

Abstract: A process for the preparation of a N-)ortho-alkylphenyl)-imide of the formula ##STR1## in which R.sup.1 to R.sup.9 is defined in the specification which comprises reacting a cyclic anhydride of the formula ##STR2## wherein R.sup.6 to R.sup.9 are difined in the specification with an amine of the formula ##STR3## optionally in the presence of an acid catalyst and optionally in the presence of a solvent which is immiscible or only slightly miscible with water but can form an azeotrope with water, at a temperature between 100.degree. to 200.degree. C. under conditions so that the water formed during the reaction is removed from the reaction mixture without the addition of a polymerization inhibitor or a dipolar solvent. The final products are used as intermediates to prepare heat-stable plastics as well as intermediates to prepare pharmaceutical and agricultural chemicals.

Abstract: Haloaryl compounds are lithiated and thereafter metalated with one of the following organometallic groups: Sn(n--Bu).sub.3 or SnMe.sub.3. The resulting aryltin compound can be transmetalated in site-specific reaction with one of the following organometallic groups: HgX, Hg(OAc).sub.2, BX.sub.3, or BZ.sub.2, wherein X is Cl, Br, or I, and Z is alkyl or alkoxy. The metalated compounds are subsequently radiohalogenated via a demetalation reaction. A functional group suitable for conjugation to protein can be added subsequent or preferably prior to the radiohalogenation.Also compounds of the formula: R.sub.1 --Ar--R.sub.2, wherein R.sub.1 is either a radiohalogen or any one of the organometallic groups stated above, Ar is aromatic or heteroaromatic ring, and R.sub.2 is a short-chain substituent that does not activate the aromatic ring and that bears a functional group, or a precursor thereof, suitable for conjugation to protein under conditions that preserve the biological activity of the protein.

Abstract: The present invention provides a class of compounds having the formula:Y--R--CH.sub.2 --CH.sub.2 --[O--CH.sub.2 --CH.sub.2 ].sub.n --R'--y'wherein n is an integer from about 5 to about 200; R is carbamate, urea, or amide; R' is carbamate, urea, amide, or oxygen; Y is 4-phenylmalemimido or 3-phenylmaleimido; and Y' is 4-phenylmalemimido, 3-phenylmaleimido, methyl or hydrogen. The present invention also provides various hemoglobin compositions modified with the class of compounds of the present invention, processes for preparing these compositions, as well as pharmaceutical compositions comprising these compositions.

Abstract: The present invention provides a stabilized maleimide compound which is hard to discolor during storage. The maleimide compound has a content of primary amines of not more than 500 ppm or further has a content of maleic anhydride in the range of 5 to 2,000 ppm or a content of 2-amino-N-substituted succinimide compounds of not more than 300 ppm. Furthermore, it is preferable that the content of chlorine compounds reduced as a chlorine atom is not more than 10 ppm and further the content of volatile components having a boiling point of not more than 200.degree. C. at normal pressure is not more than 2,000 ppm.

Abstract: The solvent-resistance and thermal stability of polyamideimides of the general formulae: ##STR1## is improved by capping the amideimides with a crosslinking functionality (Y) containing a residue selected from the group of: ##STR2## wherein R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl (either including hydroxyl or halo-substituents), halogen, or mixtures thereof;j=0, 1, or 2;G=--CH.sub.2 --, --O--, --S--, --SO.sub.2 --, --SO--, --CO--, --CHR--, or --C(R).sub.2 --;R=hydrogen, lower alkyl, or phenyl;T=methallyl or allyl;Me=methyl;R.sub.2 =a trivalent organic radical; andR.sub.3 =a divalent organic radical.The amideimide oligomers may be linear or multidimensional, and can be processed into blends, prepregs, or composites. Methods of making these amideimides and intermediates useful in the syntheses are also described. One such intermediate has the general formula:Y.sub.i --CONH--R.sub.3 --NH.sub.2and is the focus of the present application.

Abstract: In the production of an N-unsubstituted maleinimide by the ring-closing alcohol-removing treatment of an N-unsubstituted maleinamic ester for conversion into an imide, an acid catalyst or a mono(cyclo)alkyl sulfuric ester is used for the reaction. In this case, the alcohol concentration in the reaction solution is preferable to be adjusted to a low level. By using a maleinamic acid and an alcohol in conjunction with an inert solvent and an acid catalyst, a mixture of maleinamic acid with an acid catalyst, or a mono(cyclo)alkyl sulfuric ester, a corresponding maleinamic ester is obtained.

Abstract: A bisimide compound of the following general formula (I). ##STR1## (wherein each of the R's is an alkyl group having 1 to 4 carbon atoms, a phenyl group or a phenyl group substituted with an alkyl or alkoxy group having 1 to 4 carbon atoms, a plurality of these R's may be the same or different, each of the Z's is ##STR2## a plurality of these Z's may be the same or different, Y is an arylene group or an aryleneoxy group whose terminal oxygen atom bonds to (CH.sub.2).sub.n, n is an integer of 0 to 20, and m is an integer of 1 to 30.), and a process for the production of the above bisimide compound, which comprises reacting a bisamic acid corresponding to this bisimide compound in a cyclodehydration reaction.

Abstract: Disclosed is an aromatic diamine compound represented by the formula (I) ##STR1## wherein R is H or CH.sub.3. Also disclosed is a bismaleimide compound represented by the formula (IV) ##STR2## wherein R is H or CH.sub.3, A resin forming composition comprising these compounds is also disclosed. The compounds are useful as raw materials for resins, and the resin forming composition and the resin can provide excellent heat resistance and impact resistance and low hygroscopicity.

Abstract: The present invention includes N-substituted maleimides (1(H)-Pyrrole-2,5-dione (Maleimide) analogs and succinimides which act as potent nonsteroidal anti-inflammatory drugs and are capable of dual inactivation or selective inactivation of the cyclooxygenase and the peroxidase activities of prostaglandin endoperoxide synthase (PGHS).

Abstract: A polymerzable compound represented by the general formula (1) X--R.sub.1 --Y where X is un unsaturated imide group having substituents R.sub.2 and R.sub.3, or an itacon imide group where R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen, a lower alkyl group and an aromatic group having a substituent p which is hydrogen, a lower alkyl group, or an alkoxy group, and Y is a styryl group, and R.sub.1 is a divalent organic group.The polymerizable compounds is excellent in formability, and find a wide variety of applications because they have functional groups different in reactivity from each other and hence allow the curing conditions to control. The cured polymers are excellent in thermal durability, mechanical properties and electrical properties, making it possible to achieve higher performance, higher reliability, highly compact and lower weight of electric apparatuses and electronic parts.

Abstract: Compounds containing at least one alkenyl group, at least one maleimide group and at least one rodlike mesogenic moiety are prepared by reacting one or more aminophenols containing one or more rodlike mesogenic moieties with a stoichiometric quantity of a maleic anhydride per amine group of said aminophenol and then alkenylating the resulting phenolic functional maleimide.

Abstract: A method for determining the concentration of sulfide in a process stream. The method comprises the steps of adding to a process stream a sulfide scavenger (probe) that changes electronic properties when it reacts with sulfide. One can then monitor the electronic properties of the sulfide scavenger in the process stream to determine the concentration of sulfide present. In a preferred embodiment, the sulfide scavenger is either fluorescent and when it reacts with sulfide becomes inactive or is inactive and when it reacts with sulfide becomes fluorescent.

Abstract: The present invention provides bioactive compounds of the general formula: ##STR1## wherein R is H, (C.sub.1 -C.sub.4)alkyl, (C.sub.3 -C.sub.6)cycloalkyl, (C.sub.3 -C.sub.6)cycloalkyl(C.sub.1 -C.sub.4)alkyl, allyl, (C.sub.6 -C.sub.10)aryl or (C.sub.1 -C.sub.4)alkylCO.sub.2 Y; Y is H, (C.sub.1 -C.sub.4)alkyl or (C.sub.6 -C.sub.10)aryl; each X is individually H, (C.sub.1 -C.sub.4)alkyl, (C.sub.6 -C.sub.10)aryl, (C.sub.3 -C.sub.6)cycloalkyl(C.sub.1 -C.sub.4)alkyl, or (C.sub.3 -C.sub.6)cycloatkyl; the bond represented by--is present or is absent; and the pharmaceutically acceptable salts thereof, and methods for using said compounds to stimulate receptors in the mammalian nervous systems.

Abstract: The invention is from the field of heterobifunctional cross-linking reagents. More particularly, the invention concerns cross-linking reagents which combine a nucleophilic hydrazide residue with an electrophilic maleimide residue, thereby allowing coupling of aldehydes to free thiols.

Abstract: A tetrahydrofuran derivative represented by the following general formula [I]: ##STR1## wherein A represents direct bonding or a group represented by --B--CHR.sup.1 --(wherein B represents oxygen atom, sulfur atom or imino group; R.sup.1 represents hydrogen atom or an alkyl group); R represents hydrogen atom, halogen atom, hydroxyl group, an alkoxy group, benzyloxy group, an alkylsulfonyloxy group or a group represented by --O--COR.sup.2 (wherein R.sup.2 represents an alkyl group, a haloalkyl group, an alkenyl group, a cycloalkyl group, phenyl group, benzyl group, an alkoxy group, an alkylamino group or a dialkylamino group; X represents halogen atom; Y represents hydrogen atom or halogen atom) and the herbicide containing the same as the effective ingredient. The compounds of the present invention have exceedingly high herbicidal activity, and furthermore, the compounds are superior to the known similar compounds in terms of safety on crops. Thus, the compounds are useful as herbicides.

Abstract: In a process for the preparation of substituted maleimides the corresponding amines are reacted with maleic anhydride and the thermal imidization of the resulting substituted amic-acids is effected in a mixed apolar/polar aprotic solvent medium in the presence of an acid catalyst, a substantial portion of the apolar solvent is subsequently selectively removed from the reaction mixture and most of the final product is precipitated.

Abstract: The invention relates to new N-aryl-nitrogen heterocycles of the general formula (I) ##STR1## in which R.sup.1 represents hydrogen or halogen,R.sup.2 represents hydrogen or an in each case optionally substituted, straight-chain or branched radical from the series comprising alkyl, alkenyl or cycloalkyl andA represents one of the radicals or ##STR2## where R.sup.3 represents alkyl,R.sup.4 represents alkyl andR.sup.5 represents hydrogen or alkyl,a plurality of processes for their preparation, and their use as herbicides.

Abstract: A process for preparing a 3- or 4-aminobenzocyclobutene comprises aminating a 3- or 4-halo- or sulfonyloxybenzocyclobutene reactant with an aminating agent by heating at a temperature from about 80.degree. C. to a temperature at which dimerization or oligomerization of a benzocyclobutene reactant or product is a significant side reaction, in the presence of a metal-containing catalyst, for a time sufficient to aminate the halo- or sulfonyloxybenzocyclobutene reactant. In another aspect, this invention relates to a process for making a 3- or 4-phthalimido- or maleimidobenzocyclobutene, comprising reacting a 3- or 4-halobenzocyclobutene reactant with a phthalimide or maleimide compound in the presence of a metal-containing catalyst. The resulting phthalimido- or maleimidobenzocyclobutene can be hydrolyzed to a 3- or 4-aminobenzocyclobutene.

Abstract: A compound of the formula II: ##STR1## wherein n is an integer of 2 to 10,A' is a bivalent linking group formed by reacting both the reactive groups of a cross linking reagent, andB is a residue of a polypeptide compound,and physiologically acceptable salts thereof are disclosed. Such compound is useful as a non-radioactive carrier for radioactive metal elements.

Abstract: A process for the preparation of N-substituted maleimides by conducting heat-dehydration and dehydrating imidization of N-substituted maleamic acids under azeotropic distillation of generated water in a solvent mixture containing a solvent capable of forming water azeotrope and an organic aprotic polar solvent, in the presence as catalyst of a zinc salt of a maleamic acid, metallic zinc or a zinc compound which forms a zinc salt of the N-substituted maleamic acid in the reaction system.

Abstract: Solvent resistance in polyimide, polyamide, and other resins can be improved by capping these resing with mono- or difunctional crosslinking end caps. Imidophenylamines of the general formula: ##STR1## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;Me=methyl;T=allyl or methallyl;i=1 or 2;j=0, 1 or 2; andG=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --.comprise a new family of end cap monomers that are reactants in the synthesis of crosslinking, solvent resistant oligomers.

Abstract: Thermal stability of vinyl halide polymers is enhanced by the use of dienophiles such as N-alkyl maleimides, and bis compounds thereof, disclosed herein. The maleimides and bis compounds thereof produce synergistic results in terms of thermal stability of vinyl halide polymers when used in conjunction with conventional metal-containing thermal stabilizers. Environmental concerns are abated and certain other advantages are realized if the maleimides disclosed herein are used in conjunction with conventional nonmetallic thermal stabilizers to stabilize vinyl halide polymers against heat deterioration. Bis compounds of the N-alkyl maleimides disclosed herein, when used as thermal stabilizers for vinyl halide polymers, promote crosslinking without degrading the vinyl halide polymer.

Abstract: A process for the manufacture of N-phenylmaleimide which comprises reacting maleic anhydride with aniline in a single step at elevated temperature in the presence of a water-immiscible organic solvent capable of forming an azeotrope with water and of p-toluenesulfonic acis as catalyst.

Abstract: The present invention relates to copolymers prepared from olefinically unsaturated compounds, having a molecular weight (M.sub.n) of 600 to 20,000 and containing 0.1 to 6.0% by weight of secondary amino groups, --NH--, in the form of structural units corresponding to formula I ##STR1## wherein R.sub.1 is a saturated aliphatic hydrocarbon radical containing 2 to 6 carbon atoms, provided that at least two carbon atoms are arranged between the two nitrogen atoms, andR.sub.2 is a methyl, ethyl or 2-hydroxyethyl group.The present invention also relates to a process for the production of these copolymers.

Abstract: The present invention is directed to an acrylonitrile maleimides solution composition of highly desirable shelf like, having the acid component in said acrylonitrile maleimides soltuion adjusted to a level of no more than 0.1% by weight based on the amount of said maleimides contained in said solution and having a polymerization inhibitor in said solution adjusted to a level in the range of 0.0001 to 1% by weight based on the amount of said solution, and a method for the production thereof.

Abstract: Intermediates of the formula ##STR1## are new, whereR stands for alkyl, alkenyl, cycloalkyl, cycloalkenyl, cycloalkylalkyl, or cycloalkenylalkyl, in each case having up to 20 carbon atoms, in each case optionally branched and in each case interrupted by 1 to 4 oxygen atoms, andX stands for hydrogen or halogen, and are useful for synthesizing herbicidal and plant growth regulating compounds.

Abstract: A group of functionalized triamine chelants and their derivatives that form complexes with radioactive metal ions are disclosed. The complexes can be covalently attached to a protein or an antibody or antibody fragment and used for therapeutic and/or diagnostic purposes.

Abstract: Solvent resistance in polyimide, polyamide, and other resins can be improved by capping these resins with mono- or difunctional crosslinking end caps. Imidophenylamines of the general formula: ##STR1## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;Me=methyl;T=allyl or methallyl;i=1 or 2;j=0, 1, or 2; andG=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --,comprise a new family of end cap monomers that are reactants in the synthesis of crosslinking, solvent resistant oligomers.

Abstract: Heat-resistant epoxy resin composition obtained by incorporation of 2-(4-hydroxyphenyl)-2-(4-maleimidophenyl)propane in a resin composition consisting esssentially of epoxy resin and an epoxy hardener is disclosed.

Abstract: Herbicidal and plant growth-regulating substituted N-aryl nitrogen heterocycles of the formula ##STR1## in which Het stands for ##STR2## where A stands for ##STR3## where R.sup.1 and R.sup.2 in each case independently of one another stand for hydrogen, halogen, halogenoalkyl or alkyl,Y.sup.1 and Y.sup.2 in each case stand for oxygen or sulphur andZ stands for hydrogen, hydroxyl or chlorine,R stands for alkyl, alkenyl, cycloalkyl, cycloalkenyl, cycloalylalkyl, or cycloalkenylalkyl, in each case optionally branched and in each case interrupted by at least one oxygen atom, andX stands for hydrogen or halogen.Intermediates of the formula ##STR4## are also new.

Abstract: Provided are microbiocidal solutions comprising an aryl alkanol solvent and a microbiocidal compound dissolved therein. The solutions may be used to impart microbiocidal properties to polymer compositions.

Abstract: Herbicidal and plant growth-regulating N-aryl heterocycles of the formula ##STR1## where A represents one of the groupings ##STR2## where R.sup.1 and R.sup.2 in each case independently of one another represent hydrogen, halogen, halogenoalkyl or alkyl,Y.sup.1 and Y.sup.2 in each case represent oxygen or sulphur andZ represents hydrogen, hydroxyl or chlorine, R represents in each case optionally branched alkyl, alkenyl, cycloalkyl, cycloalkenyl, cycloalkylalkyl or cycloalkenylalkyl in each case interrupted by at least one oxygen atom and in each case substituted by at least one fluorine atom,X represents hydrogen or halogen andY represents hydrogen or halogen.

Abstract: A novel aromatic bismaleimide of the formula (I): ##STR1## wherein X is ##STR2## where R.sub.1 R.sub.2, R.sub.3 and R.sub.4 are a hydrogen atom or a methyl group. The bismaleimide is prepared by reacting an aromatic diamine having the formula (II): ##STR3## wherein X is the same as in the formula (I), with maleic anhydride and then conducting the ring-closing reaction of the resultant aromatic bismaleamic acid.

Abstract: N-(m-radiohalophenyl) maleimide can be conjugated with a reduced antibody having a mercapto group to provide a radiolabelled half-antibody having immunological specific binding characteristics of whole antibody.

Abstract: Solvent resistance in polyimide, polyamide, and other resins can be improved by capping these resing with mono- or difunctional crosslinking end caps. Imidophenylamines of the general formula: ##STR1## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;Me=methyl;T=allyl or methallyl;i=1 or 2;j=0, 1, or 2; andG=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --.comprise a new family of end cap monomers that are reactants in the synthesis of crosslinking, solvent resistant oligomers. The imidophenylamines are prepared by reacting the corresponding acid halide with ammonia to form an amic acid and rearranging the amic acid to the amine.

Abstract: A base-catalyzed process is provided for the preparation of cyanate esters, the process including the step of pre-reacting a phenolic starting material with the basic catalyst and then reacting the pre-reaction product with a cyanogen halide. The process permits the preparation of cyanate esters in high yields at reaction temperatures above room temperature.

Abstract: A method for the production of a maleimide, which comprises effecting a former-stage reaction by adding maleic anhydride and a primary amine in amounts such that the molar ratio of said maleic anhydride to said primary amine is less than 1 under application of heat to a water-insoluble or water-immisible inert organic solvent containing an acid catalyst and subsequently carrying out a latter-stage reaction by adding to the reaction system maleic anhydride in an amount such that the molar ratio of the total amount of maleic anhydride to be added to said reaction system to the total amount of said primary amine added to said reaction system exceeds 1.

Abstract: Method for the transportation or storage of N-phenyl maleimide, which method comprises mixing N-phenyl maleimide with maleic anhydride in a ratio of 1 to 90 parts by weight of N-phenyl maleimide to 99 to 10 parts by weight of maleic anhydride and handling the resultant mixture in a molten state in the presence of a polymerization inhibitor, and a composition of liquid state.

Abstract: Acetylene terminated aspartimides are prepared using two methods. In the first, an amino-substituted aromatic acetylene is reacted with an aromatic bismaleimide in a solvent of glacial acetic acid and/or m-cresol. In the second method, an aromatic diamine is reacted with an ethynyl containing maleimide, such as N-(3-ethynylphenyl)maleimide, in a solvent of glacial acetic acid and/or m-cresol. In addition, acetylene terminated aspartimides are blended with various acetylene terminated oligomers and polymers to yield composite materials exhibiting improved mechanical properties.

Abstract: Novel derivatives of N-phenylmaleic acid imide and N-phenylsuccinimide have good pre- and post-emergence selective herbicidal properties and they influence plant growth. The compounds correspond to the formula I in which.vertline.: represents a single or double bond,R.sup.1 represents hydrogen or fluorine,R.sup.2 represents halogen,Y represents C.sub.1 -C.sub.8 -alkyl,Z represents hydrogen or C.sub.1 -C.sub.8 -alkyl, andA represents hydrogen or a group ##STR1## wherein R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 represent customary organic radicals and X represents oxygen, sulphur, SO, SO.sub.2, NH, alkylimino or alkenylimino.

Abstract: Bis-maleimide compounds of the formula: ##STR1## where R' is an alkenylene or alkylene group; the R" groups are independently hydrocarbon or halohydrocarbon groups; and n is an integer, are hydrolytically stable compounds which may be thermally cured, or co-cured with other radically cureable monomers, to provide crosslinked polymer with good thermal properties. Compounds of the formula where n is above about 9 can be used as additives for radically cureable silicone formulations.

Abstract: Resins are prepared by Diels-Alder polymerization of compounds of the formula ##STR1## where R is a divalent linking group.

Abstract: N-substituted maleimides are prepared by reacting maleic anhydride with an amine in the presence of Cu or a copper compound and purifying the maleimide produced in the absence of presence of said Cu or copper compound. N-substituted maleimides are widely useful or starting materials or intermediates for medicines, agricultural chemicals, dyes, macromolecular compounds, and the like.

Abstract: Novel N-[(meth)allyloxy-mono-/di(meth)allylphenyl]maleimides, in admixture with at least one N-[(meth)allyloxyphenyl]maleimide, are reacted with at least one bismaleimide, and optionally a hydroxylated organosilicon compound, in the presence of an imidazole compound, to obtain mechanically improved thermosetting imido copolymerizates well adapted for the production of, e.g., coatings, adhesive bondings, laminates and composites.

Abstract: Compounds corresponding to Formula I ##STR1## wherein R.sup.1 denotes an acyl group andX denotes hydrogen, halogen, alkoxy, aroxy, SO.sub.3 H or a heterocyclic group attached through --O-- or --N<are prepared form a compound corresponding to Formula II ##STR2## wherein X has the meaning already indicated and Q denotes the group required for completing a dicarbonimide ringby reduction of the said compound to the amino compound and acylation into a compound corresponding to Formula III ##STR3## wherein X, Q and R.sup.1 have the meanings indicatedfollowed by conversion of the compound corresponding to Formula III into a compound corresponding to Formula I by hydrazinolytic or hydrolytic decomposition of the dicarbonimide ring.

Abstract: A method for the production of a maleimide by dehydration and ring-closure of maleinamic acid obtained by the reaction of maleic anhydride with an amine, which method is characterized by effecting ring-closure imidation of said maleinamic acid by heating said maleinamic acid in a water-insoluble or water-immiscible inert organic non-polar solvent in the presence of a catalyst of an amine salt produced from the amine and an acid, a mixture of the amine salt and the acid, or a supported catalyst on a solid carrier the catalyst or the acid.

Abstract: The invention is a compound which comprises an unsaturated cyclic imide moiety and an aryl cyclobutene moiety, wherein the cyclobutene moiety is fused to the aryl radical, and wherein the imide nitrogen is connected to the aryl radical by a direct bond or a bridging member. Another aspect of this invention is a polyimide polymeric composition which results from the polymerization of the above-described compounds.