90818-76-1Relevant articles and documents
STRUCTURAL STUDIES OF ORGANOBORON COMPOUNDS. XVI. PREPARATION AND CRYSTAL AND MOLECULAR STRUCTURES OF 4,4-DIMETHYL-2,5,5-TRIPHENYL-1,3-DIOXA-4-AZONIA-2-BORA-5-BORATACYCLOPENTANE AND 4,4,5,5-TETRAMETHYL-2,2-DIPHENYL-1,3-DIOXA-4-AZONIA-2-BORATACYCLOPENTANE
Kliegel, W.,Motzkus, H. W.,Rettig, Steven J.,Trotter, James
, p. 838 - 844 (2007/10/02)
Details of the synthesis, physical properties and molecular structures of 4,4-dimethyl-2,5,5-triphenyl-1,3-dioxa-4-azonia-2-bora-5-boratacyclopentane, 4, and 4,4,5,5-tetramethyl-2,2-diphenyl-1,3-dioxa-4-azonia-2-boratacyclopentane, 5, are reported.Crystals of 4 are triclinic, a = 9.841(2), b = 14.722(3), c = 6.6701(12) Angstroem, α = 86.79(1), β = 102.95(1), γ = 93.89(1), Z = 2 space group P 1-; and those of 5 are monoclinic, a = 14.9164(12), b = 6.4732(3), c = 18.2248(15) Angstroem, β = 117.263(3)deg, Z = 4, space group Cc.Both structures were solved by direct methods and were refined by full-matrix least-squares procedures to final R values of 0.032 and 0.035 for 1456 and 1649 observed reflections, respectively.Molecules of 4 contain non-palnar BOBON rings with an unusually long N(sp3)-B(sp3) distance of 1.728(3) Angstroem and in 5 there is a long N(sp3)-C(sp3) bond of 1.591(3) Angstroem.These structural features are described to steric hindrance.
