The highly regioselective partial reduction of an unsymmetrical carboxylic acid anhydride to the corresponding γ-lactone with LiAlH4 can be reversed by hydrogenation of the anhydride in the presence of [RuCl2(Ph3P)3] as catalyst.
P. Morand and M. Kayser, J. Chem. Soc., Chem. Commun., 1976, 314 DOI: 10.1039/C39760000314
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