Double Silylation of 1,4-Bis(trimethylsilyl)butadiyne with Disilanes Using a Palladium Catalyst
作者:Tetsuo Kusumoto、Tamejiro Hiyama
DOI:10.1246/bcsj.63.3103
日期:1990.11
Reaction of 1,4-bis(trimethylsilyl)butadiyne with polychlorodisilanes Si2ClxMe6−x in the presence of a palladium catalyst gives, after methylation, 1,1,4,4-tetrakis(trimethylsilyl)butatriene and/or 1,1,2,4-tetrakis(trimethylsilyl)-1-buten-3-yne selectively. Hydrogenation, hydrosilylation, and oxidation of the obtained butatriene were found to take place at C(1)=C(2) double bond exclusively. The regioselectivity is ascribed to the geminally substituted silyl groups which sterically direct the attack of electrophile and stabilize postulated radical intermediates.
1,4-双(trimethylsilyl)丁二炔与多氯二硅烷 Si2ClxMe6−x 在钯催化剂存在下反应,经过甲基化后产出选择性地生成 1,1,4,4-四(trimethylsilyl)丁四烯和/或 1,1,2,4-四(trimethylsilyl)-1-丁烯-3-炔。所得丁四烯的氢化、氢硅化和氧化仅在 C(1)=C(2) 双键处进行。其区域选择性归因于邻位取代的硅基团,从立体上引导电负荷的攻击,并稳定假设的自由基中间体。