作者:Yumin Liu、Jeffrey Schwartz
DOI:10.1016/0040-4020(94)01134-l
日期:1995.4
The reduction of aryl halides by sodium borohydride is catalyzed by titanium complexes; di(cyclopentadienyl)titanium dichloride (titanocene dichloride) is highly effective. The reaction scope and mechanism are solvent dependent. In dimethylformamide (DMF), an adduct of DMF and sodium borohydride is formed which reduces simple aryl halides by a non-radical, likely nucleophilic route. Dimethylamino-
钛配合物可催化硼氢化钠还原卤代芳基。二氯化二(环戊二烯基)钛(titanocene dichloride)非常有效。反应范围和机理取决于溶剂。在二甲基甲酰胺(DMF)中,形成了DMF和硼氢化钠的加合物,可通过非自由基的可能的亲核途径还原简单的芳基卤化物。形成二甲基氨基取代的产物,就像简单的脱氯物质一样。在二甲基乙酰胺或醚中,会发生基于自由基的反应,其中涉及活化的钛茂硼氢化物,只会产生脱氯产物。