Conclusions
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1.
A P=O bond that is exocyclic with respect to four-membered rings has a high frequency of the stretching vibrations and a low proton-acceptor capacity.
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2.
The obtained experimental data are treated as evidence of a change in the nature of the P=O grouping in strained systems.
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Literature cited
L. J. Bellamy, New Data on the Infrared Spectra of Complex Molecules [Russian translation], Mir (1971).
J. Casson, W. N. Baxter, and W. de Acetis, J. Org. Chem.,24, 247 (1959).
L. C. Thomas and R. A. Chittenden, Spectrochim. Acta,20, 467 (1964).
C. Aksnes and P. Albriksten, Acta Chem. Scand.,22, 1866 (1968).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No.2, pp.458–459, February, 1973.
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Shagidullin, R.R., Shakirov, I.K. & Tukaev, Z.A. Nature of exocyclic P-O bond. Russ Chem Bull 22, 442–443 (1973). https://doi.org/10.1007/BF00851014
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DOI: https://doi.org/10.1007/BF00851014