Reactions of trivinylborane with diboron tetrahalides: properties of some dihalogenoboryl(vinylboryl)ethanes

A. K. Holliday, R. P. Ottley
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引用次数: 6

Abstract

1 : 1 Addition of trivinylborane and diboron tetrachloride gives the adduct 1,2-bis(dichloroboryl)-1-(divinylboryl)-ethane (CH2:CH)2B·CH(BCl2)·CH2BCl2(I), which reacts with BX3(X = Cl, NMe2) to give X2B·CH(BCl2)·CH2BCl2. Dehydroboration of (I) by addition of trimethylamine gives trimethylamine-divinylborane and pyrolysis gives 1,2-bisdichloroborylethylene. Similar 1 : 1 addition using diboron tetrafluoride gives an adduct with properties similar to (I).1 : 2 Addition of trivinylborane and diboron tetrachloride gives (CH2:CH)B[CH(BCl2)·CH2BCl2]2, unstable above –78°C; a similar adduct using diboron tetrafluoride has not been isolated. 1 : 3 addition does not occur with either tetrahalide.
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三乙烯基硼烷与四卤化二硼的反应:一些二卤基硼(乙烯基硼)乙烷的性质
三乙烯基硼烷和四氯化二硼的加成得到1,2-二(二氯硼基)-1-(二乙烯基硼基)-乙烷(CH2:CH)2B·CH(BCl2)·CH2BCl2(I),它与BX3(X = Cl, NMe2)反应生成X2B·CH(BCl2)·CH2BCl2。(I)通过加入三甲胺脱氢得到三甲胺-二乙烯基硼烷,热解得到1,2-二氯硼乙烯。用四氟化二硼进行类似的1:1加成得到性质类似于(I). 1:2的加合物,三乙烯基硼烷和四氯化二硼加成得到(CH2:CH)B[CH(BCl2)·CH2BCl2]2,在-78℃以上不稳定;使用四氟化二硼的类似加合物尚未被分离出来。1:3的加法不会发生在任何四卤化物。
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