Stereochemistry of 2-substituted 5,6-benzo-1,3,2-dioxarsepines

Russian Chemical Bulletin -     

Conformation of 5-chlorotrimethylene selenite

Conclusions 5-Chlorotrimethylene selenite, with mp 157–159°, is the trans-isomer, in which in the liquid form and in solution is realized a dynamic equilibrium of two forms, diaxial and diequatorial, with a predominance of the less polar form. The more polar conformer is realized in the crystalline state.Translated from Izvestiya Akademii Nauk SSSR, Serlya Khimicheskaya, No. 8, pp. 1907–1909, August, 1977.     

Molecular structure of eight-membered cyclic sulfites with two planar fragments

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2033–2036, September, 1988.     

Dipole moments and molecular spectra of certain derivatives of dibenzalacetone

Conclusions From the spectral data it may be assumed that di-p-chlorodibenzalacetone exists in solution as a mixture of s-cis,s-cis- and s-cis, s-trans-conformations, possessing a trans-configuration of both ethylenic bonds, which does not contradict the data of the dipole moments.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1485–1489, July, 1969.     

Molecular structure of 6,6-dimethyl-2-dimethylamino-2-oxo-4,5; 7,8-dibenzo-1,3,6,2-dioxasilaphosphocin and 2-methyl-2,6-dioxo-4,5; 7,8-dibenzo-1,3,2-dioxaphosphocin

An x-ray structural investigation of the synthesized title compounds (1) and (2) has been performed. The heterocycle of 1 has a boat-chair conformation with the P²=O² bond in the axial position. The heterocycle of 2 has a distorted-boat conformation with the C⁶=O carbonyl in the plane of one of the fused benzene rings. The P²=O² bond is in a pseudoequatorial position.A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan' Scientific Center, Russian Academy of Sciences, 420083 Kazan'. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 2, pp. 329–334, February, 1992.