Treatment of bis(aryl)tellurium dichlorides or diaryl tellurides with degassed Raney nickel readily affords the corresponding biaryls. The bis(aryl)tellurium dichlorides were prepared from TeCl4 and the appropriate aromatics, with or without a Lewis acid as a catalyst, depending on the reactivity of the aromatic. The diaryl tellurides were prepared by reduction of the dichlorides with hydrazine. Attempts
用脱气的阮内
镍处理双(芳基)二
氯化碲或二芳基
碲化物容易得到相应的联芳基。取决于芳族化合物的反应性,在有或没有
路易斯酸作为催化剂的情况下,由TeCl 4和适当的芳族化合物制得二
氯化双(芳基)
碲。通过用
肼还原二
氯化物来制备二芳基
碲化物。尝试制备不对称的二
氯化物经常导致交换反应(RTeCl 3 + R'H→R'TeCl 3 + RH)。