Conclusions
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1.
The 1,3-bipolar cycloaddition of dimethyl vinylphosphonate to C,N-diphenylnitrone gave trans-2,3-diphenyl-4-dimethoxyphosphonoisoxazolidine, the structure and configurations of which were proved via the1H and31P NMR,1H -{31P} NMDR, and IR spectra.
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2.
From the stereospecificity of the vicinal spin-spin coupling constants3JPCCH and3JHCCH and the temperature dependence of the NMR spectra it follows that the isoxazolidine ring is found in the pseudorotation state.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 909–914, April, 1975.
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Arbuzov, B.A., Samitov, Y.Y., Dianova, É.N. et al. Stereochemistry of organophosphorus compounds. Russ Chem Bull 24, 823–828 (1975). https://doi.org/10.1007/BF00920701
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DOI: https://doi.org/10.1007/BF00920701