Abstract: The invention relates to an improved process for preparing cyclopropyl compounds from alkenes through reaction of the alkene in the presence of bromochloromethane, elemental zinc, and elemental copper or copper compounds (cyclopropanation reaction).

Abstract: The invention relates to an improved process for preparing epoxides from aldehydes or ketones by reacting a ketone or aldehyde with at least one sulfonium salt, and to sulfonium salts that may be used in the process of the invention.

Abstract: The invention relates to a novel process for the Pd catalysed formation of C—N bonds between an aryl halide or an aryloxysulphonyl compound and an amine in specific solvent systems, and also to the use of these solvent systems for C—N couplings.

Abstract: The present invention relates to a process for preparing enantiomerically enriched 2-butanol and to its use.

Abstract: The present invention relates to a process for preparing optionally substituted arylsulphonic anhydrides of the general formula (I)

Abstract: A process is described for recovering phosphine ligands from transition metal complexes which have been used in homogeneously catalysed reactions and contain phosphine ligands, in which a) the reaction mixture which remains after a homogeneously catalysed reaction has ended is contacted with an oxidizing agent. b) the reaction mixture is then extracted with an organic solvent which is insoluble with the reaction mixture to remove the transition metal oxide formed and then c) the oxidized phosphine ligand is isolated from the organic solvent removed from the reaction mixture.

Abstract: The present invention relates to chiral phosphorus compounds and their transition metal complexes, and also to the use of these transition metal complexes, especially in asymmetric syntheses.

Abstract: By means of a new process for the resolution of racemic 3-aminopentanenitrile, enantiomerically enriched 3-aminopentanenitrile or its salts can be obtained. For this, racemic 3-aminopentanenitrile is reacted with an enantiomerically enriched organic acid and one of the two diastereomeric salts formed is separated off and then converted into the enantiomerically enriched 3-aminopentanenitrile or its salts.

Abstract: Process for preparing substituted benzoyl cyanides of the general formula (I) where R1, R2, R3, R4, R5 are each independently hydrogen, chlorine, bromine, iodine, fluorine, a C1-C8-alkyl, aryl, arylalkyl, C1-C8-alkoxy or C1-C8-alkylmercapto radical or are —CN, —COOR6, —CONR27, —SO3R8 or —SO2NR29, where R6, R7, R8, R9 are each independently a C1-C8-alkyl radical, by a) reacting benzoyl chlorides of the general formula (II) ?in which R1, R2, R3, R4, R5 are each as defined in formula I, with 0.9-1.4 molar equivalents of copper cyanide without further solvent, optionally under elevated pressure, under inert gas atmosphere at a reaction temperature between 150 and 165° C., b) after a reaction time of not more than 5 hours and cooling to a temperature below 100° C.

Abstract: The present invention relates to a process for preparing optionally substituted arylsulphonic anhydrides of the general formula (I)

Abstract: The present invention relates to a process for preparing nitro-substituted, enantiomerically enriched 1-phenylethylamines, and to their use.

Abstract: The present invention relates to a process for preparing enantiomerically enriched 2-butanol and to its use.

Abstract: By means of a new process for the resolution of racemic 3-aminopentanenitrile, enantiomerically enriched 3-aminopentanenitrile or its salts can be obtained. For this, racemic 3-aminopentanenitrile is reacted with an enantiomerically enriched organic acid and one of the two diastereomeric salts formed is separated off and then converted into the enantiomerically enriched 3-aminopentanenitrile or its salts.