4-METHYL-3-FORMYLPENTENE-1-ACID ALKYL, MANUFACTURE, APPLICATION THEREOF TO 4-METHYL-3-FORMYL-3-PENTENE-1-ACID AND NOVEL INTERMEDIATE PRODUCT

摘要

A novel alkyl 4-methyl-3-formyl-penten-1-oate of the formula IMAGE I wherein R is alkyl of 1 to 5 carbon atoms and the dotted lines represent a double bond in the 3,4 or 4,5-position and their preparation and novel intermediates therefore and a novel process for the preparation of 4-methyl-3-formyl-pent-3-en-1-oic acid which is an intermediate for the preparation of compounds of the formula IMAGE ( alpha ) wherein R3 is selected from the group consisting of hydrogen and the residue of an alcohol R3OH by the process of European Patent Application Ser. No. 0023849 published Feb. 11, 1981, which are used to prepare very active insecticidal esters.