MOLECULAR STRUCTURE OF 1-METHYL-1- FLUOROQUASISILATRANE (2-METHYL-2-FLUORO-1,3-DIOXA-6-AZA-2-SILACYCLOOCTANE)
A. A. Korlyukov, M. G. Voronkov, É. A. Zelbst, E. A. Grebneva, O. M. Trofimova, M. Y. Antipin
Keywords: 1-methyl-1-fluoroquasisilatrane, 2-methyl-2-fluoro-1, 3-dioxa-6-aza-2-silacyclooctane, molecular structure, X-ray diffraction
Pages: 760-763
Abstract
The molecular structure of 1-methyl-1-fluoroquasisilatrane (2-methyl-2-fluoro-1,3-dioxa-6-aza-2-silacyclooctane) MeFSi(OCH2CH2)2NH (I) is determined by single crystal X-ray diffraction at 100 K. The coordination polyhedron of the silicon atom in this molecule is a slightly distorted trigonal bipyramid with an NH group and a strongly electron-withdrawing fluorine atom in the axial positions, and two endocyclic oxygen atoms and a СН3 group in three vertices of the equatorial plane. The axial angle N→SiF is 171°. The length of the transannular donor-acceptor bond N→Si (2.058 Å) is as small as in 1-fluorosilatrane. The axial bond F-Si (1.660 Å) is longer than that in 1-fluorosilatrane and tetrahedral silicon compounds.
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