Conclusions
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1.
According to data from x-ray crystallographic analysis, the eight-membered heterocycle in the molecule of 1,5-dibenzyl-3,7-diphenyl-1,5-diaza-3,7-diphosphacyclooctane has the crown conformation with the pseudoequatorial orientation of the phenyl groups at the P atoms and pseudoaxial orientation of the benzyl groups at the N atoms.
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2.
The orientation of the substituents at the N atoms and also the bond lengths and bond angles at these atoms can be explained by n-σ* interaction of the orbitals of the unshared electron pairs of the nitrogen atoms and the P-C bonds.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2279–2283, October, 1981.
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Arbuzov, B.A., Erastov, O.A., Pikonov, G.N. et al. Stereochemical structure of 1,5-dibenzyl-3,7-diphenyl-1,5-diaza-3,7-diphosphacyclooctane. Russ Chem Bull 30, 1872–1876 (1981). https://doi.org/10.1007/BF00963411
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DOI: https://doi.org/10.1007/BF00963411