作者:Jörg Haberecht、Anja Krummland、Frank Breher、Björn Gebhardt、Heinz Rüegger、Reinhard Nesper、Hansjörg Grützmacher
DOI:10.1039/b302275g
日期:——
Trialkynylborazines have been prepared in excellent yields by reacting alkynyl-bis(diisopropylamino)borane with powdered ammonium chloride in toluene. These were subsequently used in hydrosilylations with trichlorosilane and trialkoxysilanes using platinum on charcoal as heterogeneous catalyst. This reaction is stereoselective and gives the β-isomers as major product. The tris(β-tricholorsilylvinyl)-substituted derivative (Cl3SiCHCH)3B3N3H3 was isolated in pure form and transformed into a highly functionalized silica gel by a sol–gel process. This gel has a specific surface of about 315 m2 g−1 and is the first containing intact borazine rings. The structures of (iPr2N)2B–CCH, B,B′,B″-(HCCH)3B3N3H3,B,B′,B″-(Me3SiCCH)3B3N3H3 and B,B′,B″-(Cl3Si–CHCH)3B3N3H3 were determined by X-ray structure analyses and are reported.
通过炔基双(二异丙基氨基)硼烷与粉末状氯化铵在甲苯中的反应,制备出了收率极高的三炔基硼嗪。随后,使用炭上铂作为异相催化剂,将这些化合物与三氯硅烷和三烷氧基硅烷进行氢硅烷化反应。该反应具有立体选择性,主要产物为 β-异构体。分离出纯的三(β-三羟甲基乙烯基)取代衍生物 (Cl3SiCHCH)3B3N3H3,并通过溶胶-凝胶工艺将其转化为高官能度硅胶。这种凝胶的比表面约为 315 m2 g-1,是第一种含有完整硼嗪环的凝胶。通过 X 射线结构分析确定了 (iPr2N)2B-CCH、B,B′,B″-(HCCH)3B3N3H3、B,B′,B″-(Me3SiCCH)3B3N3H3 和 B,B′,B″-(Cl3Si-CHCH)3B3N3H3 的结构。