136610-80-5Relevant academic research and scientific papers
Structural studies of organoboron compounds XLVIII. 1,4-Diphenyl-3,3:6,6-bis(tetramethylene)-2,5,7-trioxa-3,6-diazonia-1,4-diboratabicycloheptane
Kliegel, Wolfgang,Riebe, Ulf,Rettig, Steven J.,Trotter, James
, p. 1222 - 1226 (2007/10/02)
The reaction of N-hydroxypyrrolidine with either oxybis(diphenylborane) or phenylboronic acid gives 1,4-diphenyl-3,3:6,6-bis(tetramethylene)-2,5,7-trioxa-3,6-diazonia-1,4-diboratabicycloheptane in moderate yield.Crystals of the product are orthorhombic, a = 10.984(2), b = 14.619(2), c = 12.311(2) Angstroem, Z = 4, space group Pccn.The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.039 and Rw = 0.043 for 908 reflections with I >/= 3?(I).This is the first heterocyclic heptane system containing a six-membered BONBON ring and a B-O-B bridge to be structurally characterized.The molecule has exact C2 symmetry with the twofold axis passing through the bridging oxygen atom.Bond lengths involving the tetrahedrally coordinated boron atom are B-O(B) = 1.423(3), B-O(N) = 1.497(3), B-N = 1.703(3), and B-C(phenyl) = 1.577(4) Angstroem. Key words: 2,5,7-trioxa-3,6-diazonia-1,4-diboratabicycloheptane ring system, crystal struture, organoboron compound.
