Reactivity of 2,6-Dihalophenyl Lithium Reagents Towards Chlorosilanes. Synthesis and Structure of 2,3- and 2,6-Dihalophenyl(di-)silanes
作者:Artem Schröder、Andreas Denhof、Enno Lork、Jens Beckmann
DOI:10.1002/zaac.201800196
日期:2018.9.17
The reaction of 2,6‐dihalophenyllithium 2,6‐X2C6H3Li (X = F, Cl, Br) with the chlorosilanes ClMe2SiSiCl2Me, SiCl4, and HSiCl3 afforded the diaryldisilanes (2,6‐X2C6H3SiMe2)2 [X = F (1a), Cl (1b), Br (1c)] and the diaryl‐ and triarylsilanes (2,6‐X2C6H3)2SiCl2 [X = F (3a), Cl (3a)], (2,3‐Br2C6H3)2SiCl2 (4c), (2,6‐F2C6H3)3SiH (6a), and (2,6‐X2C6H3)2Si(H)Cl [X = Cl (7b), Br (7c)], respectively. The formation
2,6-二卤代苯基锂2,6- X 2 C 6 H 3 Li(X = F,Cl,Br)与氯硅烷ClMe 2 SiSiCl 2 Me,SiCl 4和HSiCl 3反应得到二芳基乙硅烷(2,6 ‐ X 2 C 6 H 3 SiMe 2)2 [ X = F(1a),Cl(1b),Br(1c)]以及二芳基和三芳基硅烷(2,6‐ X 2 C 6 H 3)2 SiCl2 [ X = F(3a),Cl(3a)],(2,3-Br 2 C 6 H 3)2 SiCl 2(4c),(2,6-F 2 C 6 H 3)3 SiH(6a)和(2,6 - X 2 C 6 H 3)2 Si(H)Cl [ X = Cl(7b),Br(7c)]。4c的形成在芳基锂异构体2,6-Br 2 C 6 H 3 Li和2,3-Br 2 C 6 H 3 Li之间存在平衡的基础上合理化。使用LiAlH 4还原3a,3b,4c,7b和7c可得到二芳基硅烷(2