Basf Aktiengesellschaft

Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Basf Se Corporation

Willi Helfer

Arno Boehm

Peter Blaschka

Klaus Muellen

Peter Erk

Georg Henning

Bernhard Dung

Felix Mueller

Volker Weyrauch

Peter Schlichting

Martin Koenemann

Klaus Müllen

Harald Arms

Dirk Hammel

Simone Schaefer

Jianqiang Qu

Arno Bohm

Matthias Krieger

Georg Beck

Arno Böhm

Juergen Romeis

Felix Müller

A process for converting perylene-3,4:9,10-tetracarboximides of the general formula I in which Rand Rare each unbranched, branched or cyclic C-C-alkyl to a form suitable for use as fluorescent dyes, which comprises

Conversion of perylene-3,4:9,10-tetracarboximides to a form suitable for use as fluorescent dyes

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 Ris cyclohexyl or phenyl which may each be substituted by up to three C-C-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.

Preparation of perylen-3,4:9,10-tetracarboxylic dianhydride and also of naphtalene-1,8-dicarboximides

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.

Method for converting perylen-3,4:9,10-tetracarboxylic acid diimides into a form suitable for use as a fluorescent dye

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.

9-cyano-substituted perylene-3,4-dicarboxylic acid monoimides

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

9-Cyano-substituted perylene-3, 4-dicarboxylic monoimides

A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I comprising 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.

Method for the production of perylen-3,4:9,10-tetracarboxylic acid diimides and perylen-3,4:9,10-tetracarboxylic acid dianhydride and naphtalene-1,8-dicarboxylimides

A process for preparing terylene-3,4:11,12-tetracarboximides I where the variables are each defined as follows: 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.

Method for the production of terylene-3,4:11,12-tetracarboxydiimides by direct synthesis

Tert-alkylphenoxy-substituted polycyclic compounds of the general formula I where

Tert-alkylphenoxy-substituted polycyclic compounds

Process for producing perylene-3, 4-dicarboxylic acid imides

Preparation and purification of perylene-3,4-dicarbimides

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Friedelsheim, Germany

Willi Helfer