All-cis-1,2,3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)]2 efficiently catalyzes the Sonogashira reaction of propiolaldehyde diethyl acetal with a variety of aryl bromides and chlorides. A minor electronic effect of the substituents of the aryl bromide was observed. Similar reaction rates were observed in the presence of activated aryl bromides such as 4-trifluoromethylbromobenzene and deactivated
清一色顺-1,2,3,4-四(
二苯基膦基)
环戊烷/ [的PdCl(C 3 H ^ 5)] 2有效地催化
丙醛二乙基乙缩醛与各种芳基
溴化物和
氯化物的Sonogashira反应。观察到芳基
溴的取代基的电子效应较小。在活化的芳基
溴化物(例如4-三
氟甲基
溴苯)和失活的芳基
溴化物(例如
溴苯甲醚)的存在下,观察到相似的反应速率。该反应的营业额最高可达到95,000。甚至芳基
氯化物和杂芳基
溴化物或
氯化物也已被该催化剂成功地炔基化。此外,芳基卤化物上的各种取代基如
氟,三
氟甲基,乙酰基,苯甲酰基,甲酰基,硝基,二甲基
氨基或腈是可容许的。