The regioselective partial reduction of gem-disubstituted cyclic carboxylic acid anhydrides to the corresponding γ-lactones with LiAlH 4or NaBH4is almost completely reversed when potassium tri-s butylborohydride is used as the reducing agent.
P. Morand, J. Salvator and M. M. Kayser, J. Chem. Soc., Chem. Commun., 1982, 458 DOI: 10.1039/C39820000458
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