S. Cradock, E. Ebsworth, Brian M. Hamill
1979
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0
Influential Citations
9
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract The molecular structures of 1-silacyclopent-3-ene and 1,1-difluoro- and 1,1-dichloro-substituted species have been studied by electron diffraction. All three molecules have structures of C 2v symmetry, but there are apparent deviations from planarity of the rings caused by ring-puckering vibrations, the amplitudes of which are greatest for the fluoride, and smallest for the chloride. For 1-silacyclopent-3-ene important parameters ( r a ) are as follows: r (SiC) = 189.9(3) pm; r (CC) = 153.3(4) pm; r (CC) = 135.9(6) pm; ∠ (CCC) = 118.4(2)°. For 1,1-difluoro-1-silacyclopent-3-ene, r (SiF) = 158.3(3) pm; r (SiC) = 184.7(3) pm; r (CC) = 137.8(7) pm; ∠ (CCC) = 117.9(3)°. For 1,1-dichloro-1-silacyclopent-3-ene, r (SiCl) = 206.6(4) pm; r (SiC) = 187.6(6) pm; r (CC) = 152.6(7) pm; r (CC) = 133.0(10) pm; ∠ (CCC) = 120.3(10)°; ∠ (ClSiCl) = 103.9(5)°.