SCHEDULED MAINTENANCE
The reduction of a series of substituted phthalic anhydrides to phthalides with sodium borohydride has been studied. Preferential reduction of the carbonyl function adjacent to 3-substituents is observed. In the 4-substited analogues, selectivity of reduction is found only when the substituent is electron-donating.
A. J. McAlees, R. McCrindle and D. W. Sneddon, J. Chem. Soc., Perkin Trans. 1, 1977, 2037 DOI: 10.1039/P19770002037
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