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277ChemInform Abstract Treatment of the borane (I) with the diethylaminostannane (II) yieldsthe stannylborane (III) which reacts with triethylborane (IV) to form (V). Refluxing in benzene causes isomerization of (V) to the borol (VII) via (VI). (IR-, 1H-, 11B-, 13C-, 119Sn-NMRdata).

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Synthesis of 1,2,5-Azastannaborole Derivatives from Sulfur Diimide Anions and cis-Stannyl-boryl-alkenes. X-Ray Crystallographic Study of Two 2,5-Dihydro-1-(imino-λ4-sulfanylidene)-1,2,5-azastannaboratoles.-Since the effect of organometallic substituents at a C-C double bond on the reactivity of alkenes is of interest, the reactions of (I) with sulfur diimides are investigated. The compounds (IIIa) and (IIIb), which are characterized by X-ray crystallography, rearrange into the derivatives (IV) with an additional Sn-N coordination. (IVa) eliminates ethylene leading quantitatively to the diaminosulfone derivative (V). The compound (VII), in which a borole and a boratole ring exist, is obtained from (I) and the dianion of (VI). -(WRACKMEYER, B.; FRANK, S. M.; HERBERHOLD, M.; BORRMANN, H.; SIMON, A.; Chem.

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