Ester synthesis

Details Ester synthesis Ester synthesis

1976-09-03

1981-09-15

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260326A, 260326S, 2603472, 2603474, 260464, 260465D, 560124, 560226, 560227, 560228, C07C14368

Patent

active

042897114

ABSTRACT:
A novel process is described for the preparation of compounds of formula ##STR1## wherein R.sup.2 and R.sup.3 are each chloro or bromo; X is carboxyl, nitrile, optionally substituted carbonamide, carbonyl halide or an ester group. Those compounds wherein X is an appropriate ester group --COOB where B is an aryl group such as m-phenoxybenzyl are known insecticides; compounds where X is other than --COOB may be suitably converted thereto.
The novel process consists of a series of steps from the corresponding acetyl compound of formula ##STR2## which comprises halogenation, reduction, esterification and finally elimination reactions.

REFERENCES:
patent: 3397223 (1968-08-01), Payne
patent: 3728372 (1973-04-01), Siddall
patent: 3792079 (1974-02-01), D'Orazio
patent: 3922269 (1975-11-01), Elliott et al.
patent: 3969393 (1976-07-01), Mizutani et al.
patent: 3979519 (1976-09-01), Punja
Brown, Ind. Eng. Chem., 36, 785, (1944).
Payne, J. Org. Chem., 32, 3351, (1967).
Matsui et al., Agr. Biol. Chem., 28, 456, (1964).

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