Process for the racemization of optically active D-2-N-phenacety

Details Process for the racemization of optically active D-2-N-phenacety Process for the racemization of optically active D-2-N-phenacety

1989-05-18

1990-05-01

Evans, J. E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

C07F 930

Patent

active

049220136

ABSTRACT:
The invention relates to a process for the racemization of D-2-N-phenacetylamino-4-methylphosphinobutyric acid ##STR1## which comprises carrying out the racemization in glacial acetic acid and in the presence of acetic anhydride. The invention makes it possible to convert economically a fairly inactive herbicide into the racemic mixture which contains the highly active L form. The latter can be separated off from the racemized mixture by known methods.

REFERENCES:
patent: 3796750 (1974-03-01), Schubel et al.
patent: 4168963 (1979-09-01), Rupp et al.
patent: 4389488 (1983-06-01), Grabley et al.
patent: 4602096 (1986-07-01), Karrenbauer et al.
patent: 4633086 (1987-01-01), Grabley
patent: 4734120 (1988-03-01), Kehne et al.

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