Manufacture of esters
AssigneeImperial Chemical Industries PLC
InventorMichael S. Howarth
Life of this patent
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Abstract
m-Phenoxybenzyl esters of carboxylic acids are prepared from the methyl or ethyl esters of the acids by reaction of the latter with m-phenoxybenzyl alcohol in the presence of a transesterification catalyst of the formula Ti(O.CO.R).sub.2 Z.sub.2 in which R is a hydrocarbon radical and Z is a bidentate chelate compound.
Claims7
A process for the preparation of insecticidal esters of m-phenoxybenzyl alcohol, .alpha.-cyano-m-phenoxybenzyl alcohol and .alpha.-ethynyl-m-phenoxybenzyl alcohol with 2,2-dimethylcyclopropanecarboxylic acids which comprises mixing a methyl or ethyl ester of the carboxylic acid, m-phenoxybenzyl alcohol .alpha.-cyano-m-phenoxybenzyl alcohol or .alpha.-ethynyl-m-phenoxybenzyl alcohol and a transesterification catalyst which is a titanium compound of the formula:
- ##STR2## wherein R is a lower alkyl radical and Z is acetylacetone or ethyl acetoacetate, and heating the mixture at a temperature such that the methanol or ethanol are removed by distillation as it is formed.
Dependencies are inferred from the claim text.