The syntheses of 4-allylbenzyl, 4-benzylbenzyl and other related benzyl chrysanthemates are described. The benzyl alcohols were made by reduction of benzoic esters if these were readily available; otherwise they were made either by Grignard reactions of appropriately substituted bromobenzenes with formaldehyde, or by reactions of alkenyl halides with Grignard derivatives of bromobenzyl alcohols in which the hydroxyl group was protected as its tetrahydropyranyl ether.

This study demonstrates the syntheses of 4-allylbenzyl, 4-benzylbenzyl, and related benzyl chrysanthemates, which are essential for the synthesis of pyrethrins and related compounds.

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Pyrethrins and related compounds. IX Alkenylbenzyl and benzylbenzyl chrysanthemates

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