Conversion of in situ generated stabilized phosphorus ylides to chromene derivatives in solvent-free conditions

A Ramazani, L Yousefi, E Ahmadi…

Index: Ramazani, Ali; Yousefi, Liela; Ahmadi, Ebrahim; Souldozi, Ali Phosphorus, Sulfur and Silicon and the Related Elements, 2004 , vol. 179, # 7 p. 1459 - 1464

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Citation Number: 49

Abstract

Protonation of the highly reactive 1: 1 intermediates, produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by phenols (1- hydroxynaphthalene, 2-hydroxynaphthalene, 4-bromophenol, 2-hydroxybenzaldehyde, and 5-bromo-2-hydroxyben-zaldehyde) leads to vinyltriphenylphosphonium salts, which undergo electrophilic substitution reaction with conjugate base to produce corresponding ...