Process for the minimization of racemization in the preparation

Details Process for the minimization of racemization in the preparation Process for the minimization of racemization in the preparation

1988-05-31

1990-01-30

Lee, Mary C.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

546302, 548170, 548221, 558414, 560 55, 560 60, C07D24136, C07D21378, C07D27768, C07C 6976

Patent

active

048974811

ABSTRACT:
One of the routes to prepare optically active 2-(4-aryloxyphenoxy)propionic acid ester herbicide is to couple optically active 2-(4-hydrophenoxy)propionic acid esters with halogenated aromatic or heteroaromatic compounds. Conversion of the optically active 2-(4-hydroxyphenoxy)propionic acid ester into the acid salt prior to the coupling step effectively prevents the racemization that unexpectedly occurs otherwise.

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