A. R. Tapia-Benavides and R. Contreras, 1,4,7,8-Triazaborabicyclooctanes, First Examples of New Boron Heterocycles[1,2], Heteroatom Chemistry., 4(4), 323-327 (1993). DOI: 10.1002/hc.520040404
The first examples of 1,7,1,4,7,8-dialkyltriazaborabicyclo[3.3.0]octanes 13 [R = isopropyl (1), R = 1-phenylbenzyl (2), R = 1-methylbenzyl (3)] are reported. The bulky substituents prevent dimerization and make the syntheses feasible. The structures and conformations of the new compounds were studied by NMR spectroscopy. A chiral bicycle 3 (R,R) was also prepared.