Conclusions
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1.
Ionization constants for various types of cyclic phosphorus acids have been determined in abs. n-propanol. The pK a values of these acids are determined by the electronic nature of the dioxyalkylene substituent and the structural singularities of the exocyclic reaction center.
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2.
Factors affecting the phosphonate-phosphite tautomerism of the cyclic phosphorus acids are suggested. Passage from the phosphonate form of the phosphoric acids to the phosphite is promoted by the acceptor activity of the O-R-O group and the low value of the intracyclic angle at the P atom.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2021–2025, September, 1977.
The authors wish to thank V. F. Toropova for valuable advice concerning the analytical part of this work.
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Ovchinnikov, V.V., Galkin, V.I., Cherkasov, R.A. et al. Ionization constants of cyclic derivatives of phosphorus acids in n-propyl alcohol. Russ Chem Bull 26, 1869–1873 (1977). https://doi.org/10.1007/BF00924379
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DOI: https://doi.org/10.1007/BF00924379