Hydrogallierungsreaktionen mit den Monoalkinen H<sub>5</sub>C<sub>6</sub>-C≡C-SiMe<sub>3</sub>und H<sub>5</sub>C<sub>6</sub>-C≡C-CMe<sub>3</sub>-<i>cis</i>/<i>trans</i>-Isomerie und Substituentenaustausch
作者:Werner Uhl、Michael Claesener、Sima Haddadpour、Beate Jasper、Ines Tiesmeyer、Sarina Zemke
DOI:10.1002/zaac.200800322
日期:2008.12
dialkylgallium hydrides, R2Ga-H (R = Me, Et, nPr, iPr, tBu), by the addition of one Ga-H bond to its C≡C triple bond (hydrogallation). The gallium atoms attacked selectively those carbon atoms, which were also attached to trimethylsilyl groups. The cis arrangement of Ga and H across the resulting C=C double bonds resulted only for the sterically most shielded di(tert-butyl)gallium derivative, while in all
涉及单炔烃 H5C6-C≡C-SiMe3 和 H5C6-C≡C-CMe3 - 顺式/反式异构化和取代基交换的水镓化反应 苯基-三甲基甲硅烷基乙炔,H5C6-C≡C-SiMe3,与不同的氢化二烷基镓(R2Ga-氢化物)反应R2Ga-氢化物 R = Me, Et, nPr, iPr, tBu),通过在其 C≡C 三键上添加一个 Ga-H 键(水镓化)。镓原子选择性地攻击那些也连接到三甲基甲硅烷基的碳原子。Ga 和 H 在生成的 C = C 双键上的顺式排列仅产生于空间上最屏蔽的二(叔丁基)镓衍生物,而在所有其他情况下,随着反式加成的定量形成,发生了自发的顺式/反式重排产品。二乙基化合物Et2Ga-C(SiMe3)=C(H)-C6H5(2)通过置换交换得到副产物EtGa[C(SiMe3)=C(H)-C6H5]2(7,Z,Z)和Ga [C (SiMe3) = C (H) -C6H5] 3 (8)。有趣的是,化合物