Coupling of 1-aryl-3,3-difluoro-2-chlorocyclopropenes and phenylacetylene using Sonogashira reaction with Pd(OAc)2 and CuI as the catalyst with K2CO3 as a base yields phenylethynylcyclopropenes in high selectivity and good yields. The 13C chemical shifts of Cɛ of ∼105 ppm on acetylene group significantly different from phenylacetylene (84 ppm) suggest that the acetylene group possesses less sp hybrid
使用Sonogashira反应与Pd(OAc)2和CuI作为催化剂,以K 2 CO 3为碱,将1-芳基-3,3-二
氟-2-
氯环
丙烯与
苯乙炔偶联,可以高选择性和高收率得到
苯乙炔基环
丙烯。
乙炔基团上C 5〜105 ppm的13 C
化学位移显着不同于
苯乙炔(84 ppm),这表明
乙炔基团由于异常的长距离哈米特取代效应而具有较少的sp杂化特性。取代基参数分析也证实了这一点,而Cβ和Cɛ表现出强烈的共振效应(它们的值分别为6.89和3.37)。