Abstract:The reaction of MgCOT(thf), with tBuBF, or PhBCl, affords the first 9-borabarbaralanes 2 (C,H,BR, a: R = tBu; b: R =Ph). With the aminoboron dihalides BCI,NiPr, and BCI,N(SiMe,)tBu 9-borabicyclo[4.2.1]-nona-2,4,7-trienes 3 (a: R = NiPr,, b: R = N(SiMe,)tBu) and the trans-9-borabicyclo[4.3.0]nona-2,4,7-triene 4 are obtained. The bicyclic compounds 3 a and 3 b are converted into 9-borabarbaralanes
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