125605-76-7Relevant academic research and scientific papers
Dipotassium hydrogen phosphate-catalyzed synthesis of dialkyl 2-(4-fluoro-phenoxy)-2-butendioates from stabilized phosphorus ylides in solvent-free conditions
Ramazani, Ali,Rahimifard, Mahshid,Noshiranzadeh, Nader,Souldozi, Ali
, p. 413 - 417 (2007)
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. Copyright Taylor & Francis Group, LLC.
Process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives and intermediates thereof
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, (2008/06/13)
A process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives of the formula STR1 wherein X and Y are hydrogen atom, halogen atom or alkyl group, and R1 is hydrogen atom or alkyl group, intermediates thereof, as well as a process for the preparation of the intermediates.
