Conclusions
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1.
An x-ray diffraction structural analysis showed that a boat-chair conformation with axial orientation of the S=O bonds is realized in the crystal for 4,5;7,8-(4′,4″-dichloro)-dibenzo-6H-2-oxo-1,3,2-dioxathiocine and 4,5;7,8-(4′,4″-dichloro)dibenzo-6-thia-2-oxo-1,3,2-dioxathiocine.
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2.
The expansion of the O=S-0 bond angles and extension of the S=O bonds in these compounds are attributed to an anomeric effect.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1273–1278, June, 1989.
The authors thank Academician B. A. Arbuzov for participating in a discussion of this work.
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Kataeva, O.N., Litvinov, I.A., Naumov, V.A. et al. Anomeric effect in eight-membered cyclic sulfites with two 1,4-planar fragments. Russ Chem Bull 38, 1159–1163 (1989). https://doi.org/10.1007/BF00957145
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DOI: https://doi.org/10.1007/BF00957145