Synthesis of ‘Pear Ester’. A novel synthesis of 2,4‐diolefinic aldehydes and esters

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Abstract
Vinylogous epoxyaldehydes undergo stereospecific Wittig condensations in high yields. The resulting diolefinic epoxides are cleaved at the C(1)–C(2) single bond, when treated with periodic acid, to give the corresponding aldehydes. Direct transformation into the corresponding ethyl‐ester leads to an efficient synthesis of the ‘pear ester’.