2-bis(trimethylstannylethynyl)-tetramethyldisilane (3). The new alkyne derivative 3 reacts, already at room temperature, with trialkylboranes, R3B (5) (R = Me, Et), quantitatively to give 1,1,2,2-tetramethyl-3,7-bis(trimethylstannyl)-4,5,6-trialkyl-1,2-dihydro-1,2,5-disilaborepines (6). The reaction is much slower with R = Pri which allows detection of intermediates by NMR spectroscopy. All products are characterized
1,2-二
乙炔基四甲基乙
硅烷(之间的反应1)和diethylaminotrimethylstannane两个当量(2)导致1,2-双(trimethylstannylethynyl)-tetramethyldisilane(3)。新的
炔烃衍
生物3已在室温下与三烷基
硼烷R 3 B(5)(R = Me,Et)反应,定量生成1,1,2,2-四甲基-3,7-双(
三甲基锡烷基) -4,5,6-三烷基-1,2-二氢-1,2,5-二
硅硼平(6)。R = Pr i时反应慢得多,这可以通过NMR光谱法检测中间体。所有产品的特征是1 H,11 B,13C,29 Si和119 Sn NMR数据。