摘要 : The aerobic dehydrogenation of saturated carboxylic acids to alpha,beta-unsaturated carboxylic acids proceeded by a simple Pd(OAc)(2)/pyridine catalyst system under 1 atm of O-2. beta-Acyloxylated carboxylic acids were also produc... 展开 The aerobic dehydrogenation of saturated carboxylic acids to alpha,beta-unsaturated carboxylic acids proceeded by a simple Pd(OAc)(2)/pyridine catalyst system under 1 atm of O-2. beta-Acyloxylated carboxylic acids were also produced from propionic acid and butyric acid by the conjugate addition of the substrates to the formed alpha,beta-unsaturated carboxylic acids. When propionic acid was used as a substrate, trans-Pd(OCOEt)(2)(pyridine)(2) was formed in situ as a precatalyst. The kinetic experiments indicated that Pd(OCOR)(2)(pyridine) is a catalytically active species and that beta-C(sp(3))-H bond activation in the carboxylate ligand is the turnover-limiting step. The DFT calculations agreed with the mechanism. 收起