[RhCl(PPh3)2(Ph2PO2CCH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CMe2)] catalyses the hydrogenation of highly-substituted acrylic acids in the presence of base by a mechanism involving chelate stabilisation of alkene co-ordination and base-catalysed transesterification of the co-ordinated mixed anhydride; for hexa-2,4-dienoic acid, selective hydrogenation of the αβ double bond occurs.
S. A. Preston, D. C. Cupertino, P. Palma-Ramirez and D. J. Cole-Hamilton, J. Chem. Soc., Chem. Commun., 1986, 977 DOI: 10.1039/C39860000977
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