Abstract
The n–π* Cotton effects of seven-membered lactams have been investigated; from the results seven-membered lactams have been classified into two types: A having a negative and B a positive Cotton effect. The derived ‘lactam rule’ has been applied to conformational studies on N-methyl-A-aza-A-homo-tetrahydro-α-santonins and comparisons have been made with N-methyl-(–)-menthone lactam. The conformational equilibrium of a fused seven-membered lactam ring is discussed in the light of c.d. data.
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