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A. Lattanzi (2010)
Catalytic Asymmetric Conjugate Reactions
The aerobic dehydrogenation of saturated carboxylic acids to α,β‐unsaturated carboxylic acids proceeded by a simple Pd(OAc)2/pyridine catalyst system under 1 atm of O2. β‐Acyloxylated carboxylic acids were also produced from propionic acid and butyric acid by the conjugate addition of the substrates to the formed α,β‐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 β‐C(sp3)−H bond activation in the carboxylate ligand is the turnover‐limiting step. The DFT calculations agreed with the mechanism.
Asian Journal of Organic Chemistry – Wiley
Published: Dec 1, 2021
Keywords: carboxylic acids; dehydrogenation; oxygen; palladium; pyridine
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