摘要:
The present invention relates to a process for the preparation of 1-amino-1-methyl-3(4)-aminomethyl cyclohexane (AMCA) bya) catalytically hydrogenating 1-formamido-1-methyl-3(4)-cyano cyclohexane (FMC) in a first reaction stage to form 1-formamido-1-methyl-3(4)-aminomethyl cyclohexane (FMA), 1-amino-1-methyl-3(4)-formamidomethyl cyclohexane (AMF), 1-formamido-1-methyl-3(4)-formamidomethyl cyclohexane (FMF) and/or AMCA, andb) reacting FMA, AMF and/or FMF in a second reaction stage with an alkaline compound to from AMCA and a formic acid derivative, andc) separating the reaction mixture obtained in step b) into components by fractional distillation and/or by crystallization and filtration.The present invention is also relates to carrying the hydrogenation reaction of step a) in the presence of a formulating agent to form 1-formamido-1-methyl-3(4)-formamidomethyl cyclohexane (FMF).Finally, the present invention relates to the intermediate products 1-formamido-1-methyl-3(4)-aminomethyl cyclohexane (FMA) and 1-formamido-1-methyl-3(4)-formamidomethyl cyclohexane (FMF).
摘要:
Process for the preparation of the (S)-enantiomers of optically active cyanohydrins, in which a reaction mixture of a) an aldehyde or ketone dissolved in an organic, water-immiscible or slightly miscible diluent, b) an aqueous (S)-hydroxynitrile lyase solution and c) a cyanide group donor is stirred in such a way that an emulsion is formed which is maintained up to the end of the reaction by stirring.