Tetrahedron letters

Crown ether catalyzed stereospecific synthesis of Z-and E-stilbenes by Wittig reaction in a solid-liquid two-phases system

G Bellucci, C Chiappe, GL Moro

Index: Bellucci, Giuseppe; Chiappe, Cinzia; Lo Moro, Giacomo Tetrahedron Letters, 1996 , vol. 37, # 24 p. 4225 - 4228

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Citation Number: 61

Abstract

Potassium hydroxide and a catalytic amound of 18-crown-6 are used, in alternative to the classical Wittig conditions, to prepare very rapidly and stereoselectively Z-and E-stilbenes. In particular, the use of benzyltriphenylphosphonium iodides always leads to a complete Z- stereospecificity, while benzyldiphenylchlorophosphonium salts give a complete E- stereospecificity.