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Structural specificity of electrophilic substitution of reaction of 2-phenylbenzo[b]cyclopenta[e]pyran
Authors:Yu. N. Porshnev  V. A. Churkina  N. A. Andronova  V. V. Titov
Affiliation:(1) Scientific-Research Institute of Organic Intermediates and Dyes, 103787 Moscow
Abstract:2-Phenyl- and 1,2-diphenylbenzo[b]cyclopenta[e]pyrans were subjected to formylation, nitration, and phenylsufonylation. It was shown by PMR spectroscopy that 2-phenylbenzo[b]cyclopenta[e]pyran undergoes substitution exclusively in the 1 position. The effect of the spatial orientation and the degree of electron-acceptor character of the introduced substituents on the chemical shift of the 9-H proton was studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 902–905, July, 1977.
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