Vahid Azizkhani - Department of Chemistry, Faculty of Science, Zanjan University, Zanjan, Iran, P.O. Box ۴۵۱۹۵-۳۱۳
Ali Ramazani - Department of Chemistry, Faculty of Science, Zanjan University, Zanjan, Iran, P.O. Box ۴۵۱۹۵-۳۱۳
Morteza Rouhani - Department of Chemistry, Faculty of Science, Zanjan University, Zanjan, Iran, P.O. Box ۴۵۱۹۵-۳۱۳
Yadollah Bayat - Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between tributylphosphine and alkyl acetylenecarboxylates by 2-hydroxybenzaldehyde derivatives leads to vinyltributylphosphonium salts, which undergo Michael addition reaction with conjugate base to produce corresponding phosphorus ylides. Dipotassium hydrogen phosphate powder was found to catalyze the conversion of phosphorus ylides to new electron poor (E, Z) aryl vinyl ethers in solvent free conditions under microwave (0.5 KW, 3 min) and thermal (90◦C, 60 min) conditions.