A. Ramazani, M. Rahimifard, N. Noshiranzadeh
Jan 1, 2007
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0
Influential Citations
40
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Journal
Phosphorus, Sulfur, and Silicon and the Related Elements
Abstract
Protonation of the highly reactive 1:1 intermediates, produced in a reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by 4-fluorophenol leads to vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce dialkyl 2-(4-fluoro-phenoxy)-3-(triphenylphosphoranylidene)butanedioates. Dipotassium hydrogen phosphate powder was found to catalyze the conversion of dialkyl 2-(4-fluoro-phenoxy)-3-(triphenylphosphoranylidene)butanedioates to dialkyl 2-(4-fluoro-phenoxy)-2-butenedioates in solvent-free conditions under microwave (0.5 KW, 3 min) and thermal (90°C, 60 min) conditions.