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Optimization of triphenylphosphine oxide promoted esterification.
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aReactions were carried out with RCOOH (5 mmol, 1 equiv), R1OH (6.5 mmol, 1.3 equiv), TPPO (5 mmol, 1 equiv), (COCl)2 (6.5 mmol, 1.3 equiv) and Et3N (5 mmol) in CH3CN (5 ml) at room temperature.
bIsolated yield.
