Manganese (II) sulfate powder is an efficient catalyst for the synthesis of coumarins from in situ generated stabilized phosphorus ylides in solvent-free conditions

A Ramazani, AR Kazemizadeh…

文献索引：Ramazani, Ali; Marandi, Farzin; Kazemizadeh, Ali Reza Phosphorus, Sulfur and Silicon and the Related Elements, 2005 , vol. 180, # 7 p. 1541 - 1544

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被引用次数: 15

摘要

Abstract Protonation of the highly reactive 1: 1 intermediates, produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by phenols (1- hydroxynaphthalene, 2-hydroxynaphthalene, and 4-bromophenol) leads to vinyltriphenylphosphonium salts, which undergo aromatic electrophilic substitution reaction with conjugate base to produce corresponding stabilized phosphorus ylides. Manganese ( ...