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.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 902–905, July, 1977.
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Porshnev, Y.N., Churkina, V.A., Andronova, N.A. et al. Structural specificity of electrophilic substitution of reaction of 2-phenylbenzo[b]cyclopenta[e]pyran. Chem Heterocycl Compd 13, 728–731 (1977). https://doi.org/10.1007/BF00470189
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DOI: https://doi.org/10.1007/BF00470189