substitution by the reductants, and (in the case of o-bromonitrobenzene) with a small amount of Ullmann-type coupling of the halide. Copper(I) oxide or the metal were the most effective of the copper species examined, and both dissolved during reaction. Unsaturated substituents, particularly o-NO2, greatly enhanced reducibility. α-Bromo-ketones readily underwent similar reduction. Fission occurred in the
铜促进的氢从各种芳族供体向芳基
溴的转移,例如在约170°的2,4,6-
可力丁或二甲基乙酰胺中,导致还原性取代,ArBr → ArH(高达约80%),有时与还原剂的亲核取代,以及(在邻
溴硝基苯的情况下)与少量卤化物的乌尔曼型偶联。
氧化铜(I)或
金属是所检查的
铜种类中最有效的,并且在反应过程中均溶解。不饱和取代基,特别是o -NO 2,大大提高了还原性。α-
溴酮很容易经历类似的还原。裂变发生在o的SCN组-
硝基苯硫氰酸酯。