Synthesis of a tert-butyl substituted bis(silirane) and comparison with its methyl and phenyl analogs
作者:Kothanda Rama Pichaandi、Joel T. Mague、Mark J. Fink
DOI:10.1016/j.jorganchem.2010.10.043
日期:2011.5
The detailed syntheses of a series of substituted bis(silirane)s (Me4C2SiR)2 R = Me (1a), Ph (1b), tert-butyl (1c)} are reported. The tert-butyl derivative (1c) shows steric congestion which results in conformational rigidity in solution with respect to Si–Si bond rotation. This contrasts with the methyl (1a) and phenyl (1b) analogs. The rotational barriers of all three bis(silirane)s were examined
报道了一系列取代的双(甲硅烷基)s(Me 4 C 2 SiR)2 R = Me(1a),Ph(1b),叔丁基(1c)}的详细合成。的叔丁基衍生物(1C)表示在溶液构象刚性相对于Si-Si键的旋转空间拥塞其结果。这与甲基(1a)和苯基(1b)类似物形成对比。通过密度泛函理论(DFT)在B3LYP / 6-31G *水平上检查了所有三个双(硅烷)的旋转势垒。对于1a,计算出的旋转势垒为4.1和4.7 kcal / mol和分别为1b和1b,但对于1c则显着更高,为29.9 kcal / mol。的热解1C在145℃下在双存在(三甲基硅烷基)乙炔,得到1,4-二-叔丁基- 2,2,3,3-四甲基-5,6-双(三甲基硅烷基)-1,4- -双(二甲基甲硅烷基)乙炔与1,2-二硅环丁-1-烯中间体(B)的[2 + 2]环加成反应生成的-二硅双环[2.2.0]己-5-烯(A)。1,2-二硅环丁-1-烯