Abstract: Refined dicarboxylic acid anhydrides such as maleic anhydride are provided with improved color stability by a treating agent selected from the group consisting of chlorine and halides or elements in group IVb of the periodic table, the transition elements, vanadium, chromium, manganese, mercury, silicon, phosphorus, bismuth, antimony, lead, cerium and sulfur.

Abstract: Maleic anhydride is obtained by oxidizing an unsaturated hydrocarbon having at least 4 carbon atoms in the presence of a catalyst consisting essentially of the oxides of phosphorus and tungsten, with small amounts of a catalyst promoter selected from compounds of alkali metals, alkaline earth metals, copper, zinc, chromium, bismuth and titanium.

Abstract: Compounds of the general formula I: ##EQU1## in which R.sup.1 - R.sup.4 which may be the same or different represent hydrogen atoms, or C.sub.1.sub.-6 straight or branched chain alkyl, alkenyl or alkynyl group or an alkyl group substituted by a cycloalkyl group, or represents a cycloalkyl, alkoxycarbonyl, aryl, arakyl, acyl (which includes anylsulphonyl) groups in which the alkyl group or the alkyl portion of the aralkyl group may be substituted with one or more hydroxy or esterified hydroxy groups and in which the aryl groups or the aryl portion of the acyl or aralkyl group may be substituted by one or more halogen atoms, alkyl groups, hydroxy groups, alkoxy groups, trifluoromethyl, nitro, amino or dialkylamino groups, and in which R.sup.5 - R.sup.8 which may be the same or different represent hydrogen atoms or alkyl groups except that not all groups may be hydrogen, or R.sup.5 and R.sup.6 or R.sup.7 and R.sup.8 together represent a carbonyl (=O) oxygen and in any of the pairs of groups R.sup.1 /R.sup.2, R.

Abstract: Azomethine pigments of the formula ##SPC1##And metal complexes thereof, wherein A denotes an isocyclic or heterocyclic aromatic radical, R denotes a H atom, an alkyl group containing 1-6 C atoms, or an aryl radical, X.sub.2 and X.sub.4 denote H atoms or halogen atoms, X.sub.1 and X.sub.3 denote H atoms or halogen atoms, alkoxy or alkylmercapto groups containing 1-6 C atoms, cycloalkoxy groups containing 5-6 C atoms, or aralkoxy, aryloxy or arylmercapto groups, it being possible for one of the substituents X.sub.1 -X.sub.4 also to be a nitro group which are useful for pigmenting of high molecular material.

Abstract: Filaricidal and trypanocidal phenylarsenodithio compounds of the formula ##SPC1##Wherein R.sub.1 is --OH or --CO.NH.sub.2 or the rest ##SPC2##And R.sub.2 is hydrogen or the amino group, as well as salts of these compounds with acids and bases.

Abstract: A novel process for the preparation of 2,4-dibromo-, 2,6-dibromo- and 2,4,6-tribromopyridines, and the new bromopyridines to be obtained therewith, are disclosed. The novel process comprises treating 2,4-dichloro-, 2,6-dichloro- and 2,4,6-trichloropyridines, in an anhydrous organic medium, with gaseous HBr at temperatures between 80.degree. and 130.degree.C, said process being both simple and economical.

Abstract: Polyhalo copper phthalocyanines are purified in concentrated sulfuric acid under addition of peroxo compounds including addition compounds of hydrogen peroxide. The products are useful as pigments having very pure green shades and good fastness properties.

Abstract: Undesired vegetation such as crabgrass, downey brome, giant foxtail, yellow foxtail, barnyard grass, flax and wild oats are combated by pre-emergent application of at least one compound belonging to a class of substituted N-benzyl amides of alkanoic and benzoic acids, particularly in the presence of seeds of such crops as cotton and soybeans.

Abstract: A method for preparing a cobalt phthalocyanine complex salt is described. More particularly, the invention pertains to a method for the advantageous preparation of a 6-valence cobalt phthalocyanine complex salt composed of a 6-valence cobalt phthalocyanine complex, in which an aliphatic polyamine has been coordinated at the two ligands not occupied by the phthalocyanine ring, and a mineral acid.

Abstract: 5-(4-chlorophenyl)-2-furyl phenyl ketone is an effective anthelmintic agent.

Abstract: Unwanted vegetation is combated in the presence of grain crops and soybeans by post-emergent application of one or more of the following compounds:2-(m-chlorophenyl)-4H-3,1-benzoxazin-4-one,2-(m-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(2-thienyl)-4H-3,1-benzoxazin-4-one,2-(o-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(p-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(4-methyl-1,2,3-thiadizole-5-yl)-benzoxazin-4-one2-(m-bromophenyl)-4H-3,1-benzoxazin-4-one.

Abstract: Pyridine is prepared by reacting acetaldehyde, ammonia and oxygen at elevated temperatures and in the presence of a condensation catalyst, the oxygen (or air) oxidatively demethylating, in situ, the picolines and/or higher condensation products produced along with pyridine. A second embodiment includes incorporating methanol in the above reaction mixture. A third embodiment includes incorporating isobutyraldehyde in the above reaction mixture. These processes obviate the need for formaldehyde as a reactant.

Abstract: A process for converting .gamma.-butyrolactone to tetrahydrofuran by treating the lactone with hydrogen in the presence of a cobalt-copper chromite catalyst at elevated pressures and temperatures.

Abstract: Compounds of the formula ##SPC1##Wherein R.sub.1 is lower alkyl or phenyl lower alkyl; R.sub.2 is phenyl or substituted phenyl; and R.sub.3 is substituted or unsubstituted phenyl, naphthyl or indolyl;Are fluorogenic reagents which react with primary amino groups to form fluorophors. The above compounds are useful for fluorescent labeling of materials of biological importance.

Abstract: A process for producing citraconic anhydride from isoprene which comprises contacting the isoprene feed and oxygen-containing gas in vapor phase in a pretreatment zone at a temperature between 150.degree. and 430.degree.C with a solid base composition, said base composition comprising an alkali or alkaline earth metal, and then contacting the effluent from the pretreatment zone at a temperature between 180.degree. and 500.degree.C with a hydrocarbon oxidation catalyst effective for catalyzing the reaction of isoprene with oxygen to obtain citraconic anhydride.

Abstract: Certain 5-(4-chlorophenyl)-2-furyl ketones of the formula: ##SPC1##Wherein R is cyclopropyl or 2-furyl are effective anthelmintic agents.

Abstract: A process for recovery of good color stability maleic anhydride which comprisesA. removing maleic anhydride from a gaseous mixture containing maleic anhydride by absorption into an organic absorbent,B. distilling maleic anhydride overhead from the resulting absorbent in a first distillation column,C. condensing maleic anhydride out of the resulting overhead thereby obtaining condensed liquid maleic anhydride,D. passing at least a portion of the condensed maleic anhydride to the upper part of a second distillation column, andE. distilling material more volatile than maleic anhydride out of the condensed liquid maleic anhydride in a second distillation column, thereby obtaining stripped maleic anhydride which is withdrawn from the lower part of the second distillation column.Preferably the stripped maleic anhydride is distilled in a third distillation column and purified maleic anhydride is withdrawn as an overhead product.

Abstract: The present invention relates to new cyclic organophosphorus esters having the following structures: ##EQU1## where R is aryl or chloroalkyl of 2 to 10 carbon atoms,R' is aryloxy or chloroalkyloxy of 2 to 10 carbon atoms,R" is hydrogen, alkyl, alkenyl, furanyl or aryl of 1 to 15 carbon atoms and substituted aryl forms where the substituent is fluorine, chlorine, bromine, cyano, hydroxyl, alkyloxy, alkylthio or mixtures of such substituents, andY is O or S.The organophosphorus compounds have biological activity and are also useful as fire retardants, and as lead scavengers in gasoline.

Abstract: Quaternary ammonium salts of chloromethylated silanes or siloxanes which contain at least one[Cl.sup.-R.sub.3 "N.sup.+CH.sub.2 --Ar--(R).sub.n ]radical directly linked to a silicon atom wherein Ar is an arylene radical, wherein R.sub.3 "N taken collectively is a tertiary amine radical and wherein the compounds are useful in conventional silicon applications such as anti-static agents, wetting agents, lubricants, hydraulic fluids, coating resins, elastomers and cationic surfactants.

Abstract: Phthalocyanine dyestuffs containing the tris(trimethylsilyloxy)silylalkylamino group, ##EQU1## where R.sup.1 is H or lower alkyl are produced and are found to be compatible with cured silicone polymers.