作者:Glyn I. Harris
DOI:10.1039/j29710002083
日期:——
The effectiveness of the silicon atom in transmitting electronic effects in a series of substituted diphenylsilanediols, dialkylsilanediols, and poly(diorganosiloxane)-αω-diols has been shown by an i.r. spectroscopy study to be high. The acidities of the diorganosilanediols give an approximately linear correlation with Σσ* values, while the protondonating properties of the substituted diphenylsilanediols
红外光谱研究表明,硅原子在一系列取代的二苯基硅烷二醇,二烷基硅烷二醇和聚(二有机硅氧烷)-αω-二醇中传递电子效应的有效性很高。所述diorganosilanediols的酸度得到具有Σ的近似线性关系σ *值,而取代diphenylsilanediols的protondonating性能下降的顺序米-CF 3 >米-Cl> p -Cl> p -F> ö -Me>ħ > m -Me> p -Me> p -MeO> p -Me 2 N.根据烷基苯甲酸,二甲苯基硅烷二醇的邻位异构体是最酸性的,这同样归因于空间上的共振抑制。已经根据共振结构的贡献解释了卤代二苯基硅烷二醇的酸度,并与热缩合数据有关。计算了苯酚与聚(二有机硅氧烷)-αω-二醇相互作用的焓值,并根据硅氧烷链中的多中心π键解释了碱度的变化。许多对位取代的二苯基硅烷二醇似乎是双晶的。