Process for increasing the cis content of a mixture of cis and t

Details Process for increasing the cis content of a mixture of cis and t Process for increasing the cis content of a mixture of cis and t

1976-12-20

1978-07-18

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

71 94, C07D21132

Patent

active

041015550

ABSTRACT:
A mixture of cis and trans isomers of S-isopropyl-1-(5-ethyl-2-methylpiperidinecarbothioate) has been found to have improved herbicidal properties in contrast to the trans isomer alone. Preferably the mixture contains at least about 20%, most preferably between about 60 and about 65%, of the cis isomer.
The S-isopropyl-1-(5-ethyl-2-methylpiperidinecarbothioate) having a desired amount of cis isomer can be produced by a two-step process comprising hydrogenation of 2-methyl-5-ethyl pyridine using a catalyst comprising rhodium supported on activated carbon to produce 2-methyl-5-ethyl piperidine and reacting the piperidine with isopropyl chlorothiolformate.

REFERENCES:
patent: 3066020 (1962-11-01), Tilles et al.

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