Diterpene synthesis. Part 1. Copper(I)-catalysed 1,6-addition of a benzyl grignard reagent to a dienone

Abstract
Copper(I) salts catalyse the 1,6-conjugate addition reaction of m- and p-methoxybenzylmagnesium halides to the monocyclic linear dienone (6) at the expense of 1,2- and 1,4-addition. An improved synthesis of the dienone is reported.

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