摘要:
Reactions of vinyltrimethylsilane, propene, 3,3-dimethyl-1-butene, 1-butene, 3-methyl-1-butene, 1-pentene, 4,4-dimethyl-1-pentene, cyclopentene, cyclohexene and cyclooctene with dichloro(diisopropylamino)borane and Na/K-alloy in n-hexane yield the 1,2-diboretanes I-VII, IX, XI and the 1,2,3-triborolanes VIII, X, XII. By-products XIV and XVI-XVIII were found in the mass-spectra. In reaction to VII the 1,2,3,4-tetrakis(diisopropylamino)tetraborane(6) (XIX) was isolated as by-product. Vinyl-3-cyclohexene reacts under the same conditions to give the triborolane (XIII). The compounds I-XIII, XV and XIX were characterized by elemental analyses and spectroscopic data (MS; NMR: H-1, C-13, B-11, Si-29), X, XII, XIII and XIX also by X-ray structure analyses.