PURPOSE: To obtain the titled compds. useful as a raw material for 5-oxo-3,3- dimethylpentanoic esters easily at a low cost, by reacting a 3,3-dimethyl-4- pentenoic ester with a carboxylic acid in the presence of a Pd catalyst and O2.
CONSTITUTION: A 3,3-dimethyl-4-pentenoic ester expressed by formula I (R is alkyl) and a carboxylic and expressed by formula II (R1=R) such as acetic acid are reacted in the presence of a Pd catalyst such as palladium acetate under 0.2W100atm partial pressure of O2 at room temp. W 150°C to give a 5-acyloxy-3,3-dimethyl-4-pentenoic ester expressed by formula III and 5,5- diacyloxy-3,3-dimethylpentanoic ester expressed by formula IV. The products are acetalized, and are subjected to deprotecting reaction to obtain the aimed 5-oxo-3,3-dimethylpentanoic ester such as a compound, expressed by formula V, and known as a raw material for inspecticides such as permethrin easily at a low cost.
URATA HISAO
TANAKA MARIKO
KONDO SEI
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