Dehydroannulenes. IX. Effects of substituents on the 1H NMR spectra of tetrakisdehydro [18]-and bisdehydro [14] annulenes.

S Akiyama, M Iyoda, K Yoshitsugu, M Fukuoka…

Index: Akiyama,S. et al. Bulletin of the Chemical Society of Japan, 1978 , vol. 51, p. 3351 - 3358

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Citation Number: 5

Abstract

In order to obtain information on the cause of low field shift of 1 H NMR signals of 'acetylene- cumulene'-dehydroannulenes on introduction of substituents, the syntheses of 1, 8- bisdehydro [14]-and 6, 8, 15, 17-tetrakisdehydro [18] annulenes bearing p-substituted phenyl group (s) have been performed. The examination of their 1 H NMR spectra indicates that the low field shift of NMR signals can be regarded as a superposition of three effects, ...