An efficient and mild one-pot procedure for geminal bromochlorination of α-diazo carbonyl compounds has been developed for the first time using tetrabutylammonium dichlorobromide (TBADCB) via metal carbenoids. This protocol was found to be highly selective and does not result in dichlorination or dibromination products. The reagent, TBADCB, is commercially available, easy to prepare and handle.

中文翻译：

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四丁基二氯溴化铵：一种高效，温和的试剂，用于α-重氮羰基化合物的双溴溴化反应

对于有效的和温和的单罐方法偕α重氮羰基化合物的bromochlorination已经发展为通过金属卡宾使用四丁基dichlorobromide（TBADCB）的第一次。发现该方案具有高度选择性，不会导致二氯化或二溴化产物。试剂TBADCB是可商购的，易于制备和处理。