Reaction of 6-bromo-1-trimethylsilyl-1-hexyne with magnesium affords the corresponding Grignard reagent whose C-Mg bond intramolecularly adds to the trimethylsilylacetylene moiety in 5-Exo-Dig manner and suprafacially. The reaction can be applied to the synthesis of some cycloalkanes having stereo-defined alkylidene substituents.
6-
溴-1-三甲基甲
硅烷基-
1-己炔与
镁的反应得到相应的
格氏试剂,其C-Mg键以5-Exo-Dig方式和表面上分子内加至三甲基甲
硅烷基
乙炔部分。该反应可以用于某些具有立体定义的亚烷基取代基的环
烷烃的合成。