Process for the preparation of esters

Details Process for the preparation of esters Process for the preparation of esters

1978-10-13

1981-07-07

Brust, Joseph Paul

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

Organic compounds

Carboxylic acid esters

260326A, 2603474, 260464, 260465D, 560 61, 560105, 424274, 424285, 424304, 424305, C07C 6974, C07C 69743

Patent

active

042776171

ABSTRACT:
Novel esters in the form of their stereoisomers and mixtures of stereoisomers of the formula ##STR1## wherein X is selected from the group consisting of fluorine, chlorine and bromine R.sub.1 is selected from the group consisting of ##STR2## Y.sub.1 and Y.sub.2 may both be methyl and when Y.sub.1 is hydrogen, Y.sub.2 is selected from the group consisting of ##STR3## and Y.sub.3 and Y.sub.4 are individually selected from the group consisting of fluorine, bromine and chlorine or the group consisting of hydrogen and methyl, Z is selected from the group consisting of hydrogen, fluorine, chlorine, bromine, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and when Y.sub.2 is ##STR4## R.sub.2 is selected from the group consisting of ##STR5## A is selected from the group consisting of ##STR6## and when Y.sub.2 is --CHBr--CCl.sub.2 Br, R.sub.2 is m-phenoxy-phenyl and when R.sub.1 is R.sub.1 ' and Y.sub.2 is ##STR7## the said acid moiety may be in the cis or trans form or mixtures thereof or optically active isomeric form or racemic mixtures thereof and when R.sub.1 is R.sub.1 ", the said acid moiety is optically active isomeric form or racemic mixtures thereof and the compounds may be in one of two diastereoisomeric forms due to the existence of the asymetrical carbon atoms to which X is attached having insecticidal activity and their preparation.

REFERENCES:
patent: 3666789 (1972-05-01), Itaya et al.
patent: 3683005 (1972-08-01), Sota et al.
patent: 3835176 (1974-09-01), Matsuo et al.
patent: 3981903 (1976-09-01), Hirano et al.
patent: 4127728 (1978-11-01), Schmidt et al.
patent: 4152455 (1979-05-01), Engel
Royals, "Advanced Organic Chemistry", 1954, p. 608.
French, et al., J.A.C.S., 43(1921), pp. 651-659.

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