Conclusions
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1.
According to a calculation by the methods of molecular mechanics, the realization of only one conformation with an axial P-Cl bond is possible for 2-chloro-1,3,2-dioxaphospholane and 2-chloro-1,3,2-dithiaphospholane in accordance with the experimental data. In 2-chloro-1,3, 2-dioxaphospholane this form is close to an envelope with an 0 atom departing from the plane of the other four atoms in the ring (a-Eo), and in the dithia analog a conformation which is close to an envelope with a C atom departing from the plane (a-Ec) is realized.
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2.
According to the data from the calculation, 2-chloro-1,3,2-oxathiaphospholane should exist in the form of ana-EC ⇄ e-Ec mixture of conformers (or with the participation of twist forms).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1116–1121, May, 1986.
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Plyamovatyi, A.K., Vandyukova, I.I. & Shagidullin, R.R. Molecular structure of a number of five-membered organophosphorus compounds. Russ Chem Bull 35, 1011–1015 (1986). https://doi.org/10.1007/BF00955369
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DOI: https://doi.org/10.1007/BF00955369