Synthetic Applications of the 1-Cyclobutenyltriphenylphosphonium Salt. Synthesis and Reactions of 1,2-Difunctionalized Cyclobutanes

Article abstract of DOI:10.1021/jo00369a003

Symmetrical and unsymmetrical 1,2-bis(ylidene)cyclobutanes 6a-g and 6h were synthesized in good or moderate yields by the double Wittig reaction of a <2-(diethoxyphosphinyl)cyclobutyl>triphenylphosphonium ylide with aldehydes.The 1,2-bis(ylidene)cyclobuta