Steric effects of alkyl substituents upon the opening of the lactone ring of coumaran-2, 3-diones

T Matsuura, M Kawai, Y Butsugan

Index: Matsuura,T. et al. Bulletin of the Chemical Society of Japan, 1970 , vol. 43, p. 3891 - 3894

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Abstract

The stability of the lactone rings of alkyl substituted coumaran-2, 3-diones against hydrolysis and alcoholysis is greatly affected by the positions of alkyl substituents. From UV spectral studies it was suggested that methyl substitutions at positions adjacent to the lactone ring contribute to stability for steric reasons.