Formation of 5-Methylene-1,3-dioxepanes by the Reaction of 2,2,2-Triphenyl-1,2l5-oxaphospholanes with Paraformaldehyde
作者:Kentaro Okuma、Yuichiro Tanaka、Ichiro Shuzui、Kosei Shioji
DOI:10.3987/com-98-s(h)19
日期:——
Reaction of 2,2,2-triphenyl-1,2 lambda(5)-oxaphospholanes with paraformaldehyde yielded novel 7-membered cyclic methylene acetals (5-methylene-1,3-dioxepanes) in good yields. Phosphonium betaines reacted with paraformaldehyde to give new betaines, which further reacted with paraformaldehyde to afford olefins via Wittig reaction. The mechanism of this reaction was discussed.