1,2-BN Cyclohexane: Synthesis, Structure, Dynamics, and Reactivity
摘要:
BN/CC isosterism has emerged as a viable strategy to increase the structural diversity of carbon-based compounds. We present the first synthesis and characterization of the parent 1,2-BN cyclohexane, the BN-isostere of cyclohexane. 1,2-BN cyclohexane is an air- and water-stable compound that cleanly forms a trimer with release of dihydrogen when thermally activated. We also demonstrate that 1,2-BN cyclohexane has a lower activation barrier for ring inversion than cyclohexane due to BN/CC isosterism.
The o-phenylene bridged phosphine-borane iPr2P(o-C6H4)B(Fxyl)22 was prepared. Despite ring strain, it adopts a closed form, as substantiated by NMR, XRD, and DFT analyses. However, the corresponding open form is only slightly higher in energy. The dormant Lewis pair 2 proved to efficiently catalyze the dehydrogenation of a variety of amine- and diamine-boranes under mild conditions. The corresponding
制备邻苯撑桥连的膦-硼烷i Pr 2 P(o -C 6 H 4)B(己基)2 2。尽管有环应变,但仍采用密闭形式,通过NMR,XRD和DFT分析证实。但是,相应的开放形式在能量上仅稍高一些。休眠的路易斯对2被证明可以在温和的条件下有效催化多种胺和二胺-硼烷的脱氢反应。相应的硼酸i i Pr 2 PH(o -C 6 H 4)BH(Fxyl)2 3被鉴定为这些脱氢反应的关键中间体。3释放H 2的倾向在催化周转中起主要作用。
[EN] BORON-NITROGEN HETEROCYCLES<br/>[FR] HÉTÉROCYCLES DE BORE-AZOTE