Abstract: A process for converting perylene-3,4:9,10-tetracarboximides of the general formula I in which R1 and R2 are each unbranched, branched or cyclic C1-C8-alkyl to a form suitable for use as fluorescent dyes, which comprises a) dissolving or suspending the perylene-3,4:9,10-tetracarboximides whose molecules have a molecular volume of ?230 ?3 in an organic or inorganic solvent at from 0 to 250° C.

Abstract: A process for preparing perylene-3,4:9,10-tetracarboxylic dianhydride, comprising: dimerizing a naphthalene-1,8-dicarboximide of the formula IIa; reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide of the formula Ia; hydrolyzing the diimide to the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid in the presence of an inert organic solvent, of an alkali metal base and of water; and subjecting the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid to the action of an aqueous inorganic acid to convert it into perylene-3,4:9,10-tetracarboxylic dianhydride; wherein R3 is cyclohexyl or phenyl which may each be substituted by up to three C1-C4-alkyl radicals, and the dimerizing is in a substantially homogeneous reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base.

Abstract: Novel crystalline forms of and a process for converting perylene-3, 4:9, 10-tetracarboximide of the general formula I to a form used as a fluorescent dye. The process including: a) dissolving or suspending the perylene-3, 4:9, 10-tetracarboximide in a solvent to obtain a solution or suspension; and b1) cooling the solution obtained in step a) to a temperature at or below the crystallization temperature of the perylene-3, 4:9, 10-tetracarboximide and, if the solvent is organic, removing excess solvent until the first crystals form, otherwise, adding water or dilute aqueous solutions of the solvent until the first crystals form, and maintaining the solution at that temperature for further crystallization; or b2) cooling the suspension obtained in step a) to or below the crystallization temperature when the temperature in step a) was above the crystallization temperature, and maintaining the suspension at the temperature for further crystallization to form one or more solvate crystals.

Abstract: Novel crystalline forms of and a process for converting perylene-3,4:9,10-tetracarboximide of the general formula I to a form used as a fluorescent dye. The process including: a) dissolving or suspending the perylene-3,4:9,10-tetracarboximide in a solvent to obtain a solution or suspension; and b1) cooling the solution obtained in step a) to a temperature at or below the crystallization temperature of the perylene-3,4:9,10-tetracarboximide and, if the solvent is organic, removing excess solvent until the first crystals form, otherwise, adding water or dilute aqueous solutions of the solvent until the first crystals form, and maintaining the solution at that temperature for further crystallization; or b2) cooling the suspension obtained in step a) to or below the crystallization temperature when the temperature in step a) was above the crystallization temperature, and maintaining the suspension at the temperature for further crystallization to form one or more solvate crystals.

Abstract: A process for converting perylene-3,4:9,10-tetracarboximides of the general formula I in which R1 and R2 are each unbranched, branched or cyclic C1-C8-alkyl to a form suitable for use as fluorescent dyes, which comprises a) dissolving or suspending the perylene-3,4:9,10-tetracarboximides whose molecules have a molecular volume of ?230 ?3 in an organic or inorganic solvent at from 0 to 250° C.

Abstract: The current invention relates to a perylene-3,4-dicarboxylic anhydride, substituted in the 9-position, of the general formula III wherein Z is bromine or cyano, and processes for preparing 9-bromoperylene-3,4-dicarboxylic anhydride and 9-cyanoperylene-3,4-dicarboxylic anhydride.

Abstract: The current invention relates to a perylene-3,4-dicarboxylic anhydride, substituted in the 9-position, of the general formula III wherein Z is bromine or cyano, and processes for preparing 9-bromoperylene-3,4-dicarboxylic anhydride and 9-cyanoperylene-3,4-dicarboxylic anhydride.

Abstract: A 9-cyano-substituted perylene-3,4-dicarboxylic monoimide I where the variables are defined in the specification.

Abstract: A process for preparing perylene-3,4:9,10-tetracarboxylic dianhydride, comprising: dimerizing a naphthalene-1,8-dicarboximide of the formula IIa; reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide of the formula Ia; hydrolyzing the diimide to the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid in the presence of an inert organic solvent, of an alkali metal base and of water; and subjecting the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid to the action of an aqueous inorganic acid to convert it into perylene-3,4:9,10-tetracarboxylic dianhydride; wherein R3 is cyclohexyl or phenyl which may each be substituted by up to three C1-C4-alkyl radicals, and the dimerizing is in a substantially homogeneous reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base.

Abstract: A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I comprising dimerizing a naphthalene-1,8-dicarboximide of the formula II in a reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base and subsequently reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide in the presence of a polar solvent.

Abstract: A process for preparing terylene-3,4:11,12-tetracarboximides I where the variables are each defined as follows: R, R? are each independently hydrogen; if desired substituted alkyl or cycloalkyl; R1 is hydrogen or alkyl; R2 is hydrogen; alkyl; if desired substituted aryl or hetaryl, by reacting a perylene-3,4-dicarboximide II in the presence of a base-stable, high-boiling organic solvent and of an alkali metal or alkaline earth metal base, with a naphthalene-1,8-dicarboximide III in which X is hydrogen, bromine or chlorine.

Abstract: A process for preparing terylene-3,4:11,12-tetracarboximides I where the variables are each defined as follows: R, R? are each independently hydrogen; if desired substituted alkyl or cycloalkyl; R1 is hydrogen or alkyl; R2 is hydrogen; alkyl; if desired substituted aryl or hetaryl, by reacting a perylene-3,4-dicarboximide II in the presence of a base-stable, high-boiling organic solvent and of an alkali metal or alkaline earth metal base, with a naphthalene-1,8-dicarboximide III in which X is hydrogen, bromine or chlorine.

Abstract: Tert-alkylphenoxy-substituted polycyclic compounds of the general formula I where P is a conjugated polycyclic radical which is stable to bases and nucleophiles, optionally bears aryl substituents and contains no group from the group consisting of —CO—NH—CO—, —COOH and —CO—O—CO—; R is C1–C8-alkyl, whose carbon chain may be interrupted by one or more groups selected from the group consisting of —O—, —S—, —NR1—, —CO— and/or —SO2— and which may be monosubstituted or polysubstituted by C1–C6-alkoxy or by a 5- to 7-membered heterocyclic radical which is attached via a nitrogen atom and may contain further heteroatoms and be aromatic; C5–C8-cycloalkyl whose carbon chain may be interrupted by one or more groups selected from the group consisting of —O—, —S—, —NR1—, —CO— and/or —SO2— and which may be monosubstituted or polysubstituted by C1–C6-alkyl; R1 is hydrogen or C1–C6-alkyl; Hal is chlorine and/or bromine; m is from 0 to 15; n is from 1 to 16, subject to the proviso that the sum m+n is ?16, are prepared a

Abstract: A process for converting perylene-3,4:9,10-tetracarboximides of the general formula I in which R1 and R2 are each unbranched, branched or cyclic C1-C8-alkyl to a form suitable for use as fluorescent dyes, which comprises a) dissolving or suspending the perylene-3,4:9,10-tetracarboximides in an organic or inorganic solvent whose molecules have a molecular volume of ?230 ?3 at from 0 to 250° C.

Abstract: A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I where R is C1-C30-alkyl whose carbon chain may be interrupted by one or more —O— moieties and/or which may be substituted by one or more substituents selected from the group consisting of C5-C8-cycloalkyl (which may be substituted by one or more C1-C6-alkyl substituents), phenyl or phenyl-C1-C6-alkyl (which may each be substituted by one or more C1-C18-alkyl and/or C1-C6-alkoxy substituents), —OCOR1, —N(R1)2, —SO2NH2, —SO2N(R1)2, —CON(R1)2 and —COOR1; C5-C8-cycloalkyl whose carbon skeleton may be interrupted by one or more moieties selected from the group consisting of —O—, —S— and —NR2- and/or which may be substituted by one or more C1-C6-alkyl substituents; phenyl, phenyl-C1-C6-alkyl, naphthyl or hetaryl, which may each be substituted by one or more substituents selected from the group consisting of C1-C18-alkyl, C1-C6-alkoxy, phenylazo, naphthylazo, pyridylazo, pyrimidylazo, cyano, —N(R1)2, —CON(R1)2 and —COO

Abstract: tert-Alkylphenoxy-substituted polycyclic compounds of the general formula I 1

Abstract: Perylene-3,4-dicarboximides I ##STR1## (R.sup.1 is hydrogen; C.sub.1 -C.sub.8 -alkyl; C.sub.5 -C.sub.8 -cycloalkyl; substituted or unsubstituted phenyl or naphthyl;R.sup.2 independently at each occurrence is hydrogen; C.sub.1 -C.sub.18 -alkyl, substituted or unsubstituted aryloxy, arylthio, hetaryloxy or hetarylthio)are prepared by reacting the corresponding perylene-3,4,9,10-tetracarboxylic acid or its anhydride (II) with an amide IIIR.sup.3 --CO--NHR.sup.1 III(R.sup.3 : C.sub.1 -C.sub.4 -alkyl or --NR.sup.4 R.sup.5 where R.sup.4 and R.sup.5 independently are hydrogen or one of the R.sup.1 alkyls, cycloalkyls, phenyls or naphthyls and where if two or more of R.sup.1, R.sup.4 and R.sup.5 are other than hydrogen they are identical)under superatmospheric pressure in the presence of an inert diluent and a transition metal catalyst.

Abstract: Preparation of perylene-3,4-dicarbimides by reaction of a perylene-3,4,9,10-tetracarboxylic acid or of the corresponding anhydrides with a primary amine by performing the reaction in the presence of a tertiary nitrogen base as solvent and of a transition metal or transition metal salt as catalyst, and purification of perylene-3,4-dicarbimides obtained by reaction of a perylene-3,4,9,10-tetracarboxylic acid or of the corresponding anhydrides with a primary amine by heating the crude products initially in N-methylpyrrolidone and then treating the resulting N-methylpyrrolidone adducts in the presence of an organic diluent with a base, and if desired subjecting the subsequently isolated products to an additional treatment with an aqueous acid, and also novel perylene-3,4-dicarbimides and their use as fluorescent dyes, pigments or pigment additive precursors.