The Halide-promoted fragmentation of 1-chloro-1-fluoro-2-(a-silylakyl))cyclopropanes: A new entry to fluorodienes
作者:Manfred Schlosser、Rahel Dahan、Sylvain Cottens
DOI:10.1002/hlca.19840670134
日期:1984.2.1
When heated in the presence of tetrabutylammonium fluoride or chloride, 1-chloro-1-fluoro-2-(trimethylsilyl)methyl-cyclopropanes (1, 2 and 3) undergo smooth ring-opening fragmentation to afford 2-fluoro-butadienes ((4, 5 and 6 resp.) with high yields. Despite unfavorable geometries, the reaction is concerted and the inversion mode of rotation dominates over the retention mode by a factor roughly 100
当以四丁基氟化铵或氯,1-氯-1-氟-2-(三甲基甲硅烷)甲基-环丙烷(存在下加热1,2和3)进行平滑的开环碎片,得到2-氟丁二烯((4,5和6)(尽管几何形状不利),但反应仍然协调一致,旋转的反转模式比保留模式高出约100倍。