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直接转移氢化反应是指氢原子在没有催化剂参与的情况下从氢供体转移到氢受体的过程——即所谓不含金属的反应.该过程是机理研究中理想的基本步骤,却通常因反应能垒太高而鲜少报道.然而,理论和实验研究都表明,提高底物的极性可有效降低反应能垒,意味着极性的氢供体和氢受体直接很可能发生这类反应.氨硼烷是一种含氢量很高的知名化学储氢材料,同时,它也是一种同时含有正、负电性氢原子的理想极性氢供体.事实上,以氨硼烷为极性氢供体,亚胺、极化烯烃以及醛酮等为极性氢受体,直接转移氢化反应能在温和条件下发生.主要对这些反应的底物范围以及机理上的异同进行了综述.
Direct Transfer Hydrogenation refers to the process by which hydrogen atoms are transferred from a hydrogen donor to a hydrogen acceptor-the so-called metal-free reaction-without the catalyst being involved This process is an ideal basic step in a mechanistic study and is usually due to However, both theoretical and experimental studies show that increasing the polarity of the substrate can effectively reduce the energy barrier of the reaction, which means that polar hydrogen donors and hydrogen acceptors are likely to occur directly Ammonia borane is a well-known chemical hydrogen storage material with high hydrogen content, meanwhile, it is also an ideal polar hydrogen donor containing both positive and negative electrical hydrogen atoms.In fact, Polar hydrogen donors, imines, polar olefins and aldehydes and ketones as polar hydrogen acceptors, direct transfer hydrogenation can occur under mild conditions. The main scope of these reactions substrate and mechanism of the similarities and differences were reviewed .