Process for optical resolution of crude trans-1,2-cyclohexanedia

Details Process for optical resolution of crude trans-1,2-cyclohexanedia Process for optical resolution of crude trans-1,2-cyclohexanedia

1976-08-03

1978-04-18

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 8738, C07C 8740

Patent

active

040851389

ABSTRACT:
Crude trans-1,2-cyclohexanediamine (DACH) contained in a mixture of amines derived as a by-product from the manufacture of 1,6-hexanediamine (HDA) or any other synthesis process crude by-product stream may be directly resolved into its optical isomers by using a mixture of tartaric acid and a second acid selected from the group consisting of C.sub.1 to C.sub.8 carboxylic acids and HCl, without first separating the DACH in high purity from the mixed amine component by-product stream. Alternatively, racemic DACH may be separated from a crude mixed amine component by-product stream by use of oxalic, sulfuric and/or nitric acids. This racemic product may then be optically resolved by techniques known in the art.

REFERENCES:
patent: 3679746 (1972-07-01), Brake
patent: 3767707 (1973-10-01), Cleary
patent: 3781362 (1973-12-01), Blackstone
patent: 3829490 (1974-08-01), Mueller et al.
patent: 3880925 (1975-04-01), Langer et al.

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