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4-Bromo and 3-bromobenzoic acids along with 4-iodobenzoic acid underwent P–C coupling reactions with diarylphosphine oxides in the absence of any catalyst in water as the solvent under microwave irradiation. The phosphinoylbenzoic acids obtained were converted into the corresponding ethyl esters in yields of 59–82%.
Under microwave conditions, the P–C coupling of aryl bromides and >P(O)H species, such as dialkyl phosphites, alkyl aryl-H-phosphinates, or diphenylphosphine oxide takes place in the presence of Pd(OAc) 2 as the catalyst and triethylamine as the base without using any P-ligand or solvent. The method described is green and is of more general value
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