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碳化硼（B4C）能在C／C、Cf／SiC复合材料的表面涂层做自封闭层材料[1,2]，在提高Cf的抗氧化性和改善界面方面有明显的效果。烷基化硼（R3B）热裂解可得到B4C，因此，研究烷基化棚的合成有着重要的意义。它的合成一般采用有机金属路线[3]，为了获得高产率的有机硼烷，本文用修
Boron carbide (B4C) can be self-sealing material on the surface coating of C / C, Cf / SiC composites [1,2], and has obvious effect in improving the oxidation resistance of Cf and improving the interface. The alkylation of boron (R3B) pyrolysis can be obtained B4C, therefore, the alkylation of greenhouse synthesis has important significance. Its synthesis generally adopts the organometallic route [3]. In order to obtain high yield of organoborane,