Tetrahedron Letters p. 4233 - 4236 (1993)
Update date:2022-08-04
Topics:
Okuma
Tanaka
Ohta
Reaction of oxaphosphoranes with paraformaldehyde yielded novel 7-membered cyclic vinylidene acetals in almost quantitative yield. Phosphonium betaines reacted with parformaldehyde to give new betaines, which further reacted with paraformaldehyde to afford olefins via Wittig reaction.
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(1950)
