Non-equivalence of methylenedioxy protons in Cyclolignans

Govindachari, T. R. ; Nagarajan, K. ; Viswanathan, N. (1971) Non-equivalence of methylenedioxy protons in Cyclolignans Indian Journal of Chemistry, 9 . pp. 546-548. ISSN 0019-5103

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The conditions for observation of non-equivalence of CH302 protons in rings A and C of cyclolignans are discussed. The protons of the CH2O2 group when present in ring A at 7,8-position are equivalent when ring B is aromatic and non-equivalent when it is hydroaromatic. When the CH2O2 group is; present in ring C at 3',4'-positions non-equivalence is observed if there is a second CH2O2 function at 7,8-positions or if there is a C = 0 group attached to C-2 of ring B.

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Deposited On:19 Jun 2012 07:20
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