Vibrational spectra and structure of trivinylborane

Studies of silyl and germyl Group VI species. Part VII. The substituent effects of the vinyl group in 1,3-divinyltetramethyldisilyl chalcogenides

“…The remaining bands appearing at ca. 1264, 1000, 947, and 1242 cm-' are assigned to p(CH), 6,,(CH), 6,,,(CHz), and 6,(CH3) in agreement with previous reports (9,11,12,25), as are the C3Si skeletal vibrations between ca. 787 and ca.…”

Vibrational spectra and conformations of tris(perfluorovinyl)borane

“…The BC3 motions have frequencies similar to those found in trimethylborane20 and trivinylborane. 8 The only vibrational frequencies we have not observed are those for vu, v21, and i>28, the B-C torsion (A), the C=C twist (E), and the B-C torsion (E), respectively.…”

“…On the basis of electron diffraction measurements, trivinylborane has been reported to be planar,6 and vibrational data have been reported to support this contention.7 However, more detailed vibrational studies indicate the presence of multiple conformers in the fluid states and a single planar structure in the crystalline solid. 8 Fluorine substituted vinyl analogues have also been studied with regard to the question of delocalization. The preparation and characterization of a number of perfluorovinylboranes have been reported previously.9 '12 Vibrational spectra have been measured for perfluorovinyldifluoroborane and perfluorovinyldichloroborane,9,10,13 and the data are consistent with planar structures for these two compounds.…”

Boron-carbon coupling constants. III. Determination and calculation of JBC in some simple organoboranes

“…Trivinylborane samples were obtained via two different synthetic routes, one of which has been previously described in detail. 26 The second method involved the reaction of boron tribromide with tetravinyltin (both obtained commercially from Columbia Organic Chemicals Co., Inc.). Boron tribromide was purified by trap-to-trap fractionation until its vapor pressure was 19 mm at 0°.…”