Conclusions
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1.
The stretching vibrations of the PN and PO bonds in eight studied phospholanes with a trlvalent P atom appear as high-intensity bands and lines in the IR and Raman spectra in the regions 635–712 and 700–785 cm−1, respectively.
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2.
A high value ofνPO can serve as a spectral indicator of an endocyclic PO bond. An analogous dependence ofνPN on the exocyclic, endocyclic, or acyclic character of the PN bond has not been found.
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3.
TheνPO andνPN frequencies are sensitive to the conformation and enable judgement to be made of the conformational nonuniformity of heterocyclic compounds with an exocyclic O atom, as well as of 2-dimethylamino-1,3,2-oxathiophospholane.
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4.
All the heterocycles studied possess asymmetric conformations.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2232–2235, October, 1985.
The authors thank I. A. Nuretdinova for participating in the discussion and for valuable comments.
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Shagidullin, R.R., Shakirov, I.K., Nuretdinova, O.N. et al. Structural information content of the stretching vibration frequencies of PN and PO bonds in five-membered heterocyclic compounds. Russ Chem Bull 34, 2064–2067 (1985). https://doi.org/10.1007/BF00963234
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DOI: https://doi.org/10.1007/BF00963234