Conclusions
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1.
2-Methyl-2-phenyl-1,3-dioxa-5,6-benzocycloheptene and its isomeric 4-methyl-substituted derivatives exist in the twist conformation.
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2.
In the PMR of these compounds the benzyl protons and 4-methyl groups are coupled and the screening influence of the 2-phenyl substituent on the gauche-oriented methylene protons was revealed.
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Translated from Izvestiya Akademii Nauk SSSR, No. 5, pp. 1072–1076, May, 1986.
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Arbuzov, B.A., Klimovitskii, E.N., Sergeeva, G.N. et al. Stereochemistry of seven-membered heterocycles. Communication 17. PMR spectra and conformation of 2-methyl-2-phenyl-1, 3-dioxa-5,6-benzocycloheptene and its isomeric 4-methyl derivatives. Russ Chem Bull 35, 971–974 (1986). https://doi.org/10.1007/BF00955360
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DOI: https://doi.org/10.1007/BF00955360