Process for the minimization of racemization in the...

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

C - Chemistry, Metallurgy

07

C

260/297, 260/309

C07C 69/736 (2006.01) C07C 205/38 (2006.01) C07C 255/54 (2006.01) C07D 213/64 (2006.01) C07D 213/643 (2006.01)

Patent

CA 1327804

ABSTRACT One of the routes to prepare optically active 2 -(4-aryloxphenoxy)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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