ChemInform Abstract The formation of the tetrathiaazatriborabicyclooctanes (IV) occurs via the dithiazadiborolidines (III). The bromo derivative (IVb) reacts with an additional equiv. disulfane (II) to produce impure tricyclic NB3S6, but with an excess of (II) the tricyclic system (V) is obtained. The halogens in (IV) can be substituted by a methyl group from SnMe4 (VI). The amination of (IVa) with two equiv. SnMe3(NEt2) (VIII) seems to proceed via the bis(diethylamino) derivative, but the tricyclic title compound (IX) (space group P1, Z=2) is isolated as the final product. UV and He I photoelectron spectra support NMR evidence that the bicyclic rings (IV) are planar 10π-electron systems. This conclusion is supported by MNDO and PPP calculations.
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