Tetrahedron p. 1523 - 1528 (1983)
Update date:2022-08-16
Topics:
Osborne, A. G.
The structure of Hantzsch and Zuerchers "dimethyldicoumarin" obtained from resorcinol or 7-hydroxy-4-methylcoumarin and ethylacetatoacetate has been confirmed as the linear title compound 1. peri-Substituent effects in 1H and 13C NMR spectroscopy have been used to differentiate between the lin and ang isomers, the ang Me groups being deshielded.A set of rules to govern the formation of lin/ang isomers has been proposed.
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