Esters of .alpha.,.alpha.-haloalkyl boronic acids are prepared by the addition of an alkali metal dialkylamide, or some other equivalent sterically hindered base to a mixture of a 1,1-dihaloalkane and a trialkyl borate in an organic solvent at a temperature between about -78.degree. C. and +25.degree. C. In one embodiment, diisopropyl (dichloromethyl)borate is formed by the addition of lithium diisopropylamide to a mixture of dichloromethane and triisopropyl borate in the presence of tetrahydrofuran as the solvent medium at a temperature between about -10.degree. C. and +10.degree. C.
.alpha.,.alpha.-卤代烷基
硼酸酯是通过在有机溶剂中,在温度在-78℃至+25℃之间的条件下,将碱
金属二烷基胺或其他等效的立体位阻碍碱加入1,1-二卤代烷和三烷基
硼酸酯的混合物中制备而成。在一种实施例中,通过在
四氢呋喃作为溶剂介质的条件下,在-10℃至+10℃的温度下,将
二氯甲烷和
三异丙基硼酸酯混合物中加入
锂二异丙基胺来制备
二异丙基(二
氯甲基)
硼酸酯。