Bridge derivatives of CC′-dimethyl-4,5-dicarba-nido-hexaborane(8)

Organosilyl and silylorgano derivatives of 2,3-dicarbahexaborane(8). Conversion of B-(chlorodimethyl)silylmethyl-2,3-dicarbahexaborane(8) to B-(chlorodimethyl)silylmethyl derivatives of 1,5-dicarbapentaborane(5) and 1,6-dicarbahexaborane(6)

“…Using the _ µ doublet as a criterion for structural assignment seems to work only in the positive sense; that is, if it is not observed, it is not necessarily structurally diagnostic (e.g., the B(4)-C boron in III is adjacent to one bridge hydrogen but no -µ doublet is observed). The appearance of highly resolved -µ coupling though, upon partial intramolecular rearrangement of III at 590 °C, strongly suggests the B (4,6) borons in the rearranged product are now unsubstituted, implying B(5) substitution in this case.…”