d-Orbital effects in silicon substituted π-electron systems. Part XII. Some spectroscopic properties of alkyl and silyl acetylenes and polyacetylenes
作者:H. Bock、H. Seidl
DOI:10.1039/j29680001158
日期:——
signals, and electronic transitions are reported for acetylenes X·[CC]n·X (n= 1, 2, 3; X = H, CMe3, CH2·SiMe3, SiMe3). Comparison with the corresponding data of ethylene and butadiene derivatives indicates stronger electron back-donation to silicone Si â†� Cπ which is interpreted as being due to interactions with both of the perpendicular acetylene π-components. The inductive polarization +l(SiR3) >
报告了乙炔X·[ CC] n ·X(n = 1,2,3; X = H,CMe 3,CH 2 ·SiMe 3的垂直电离能,特征振动频率,1 H nmr信号和电子跃迁,SiMe 3)。与乙烯和丁二烯衍生物的相应数据比较指示更强的电子背捐赠硅氧烷的Si â† Ç π这被解释为是由于与两者的垂直乙炔相互作用π -components。感应极化+ l(SiR 3)> + /(CR 3)可由CH 2 ·SiR 3基团的取代作用来估计。
In the present work, we demonstrate a regioselective [2 + 2 + 2] cyclotrimerization of 1,3-diynes catalyzed by Ni0 to provide hexasubstituted benzenes (HSBs). HSBs have significant applications as functional materials and pharmaceuticals. The present protocol exhibited remarkable versatility, transforming 1,3-diynes with diverse alkyl, aryl, and heterocyclic groups to the corresponding HSBs. With the