Low symmetry metal complexes: chloro cysteine ethyl ester-N,S triphenylphosphine palladium(II), a new regioselective hydrocarboxylation catalyst for 2-phenylpropanoic acid, and its crystal structure

Abstract

The hydrochlorides of cysteamine, cysteine ethyl ester and penicillamine methyl ester, react with Pd(PPh₃)₄ to yield low symmetry complexes of palladium(II) that incorporate the N,S-aminothiolato ligand and triphenylphosphine; the complex with cysteine ethyl ester, structurally characterized by X-ray diffraction, proved to be an effective catalyst for the hydrocarboxylation of styrene with high selectivity (98%) towards 2-phenylpropanoic acid.

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