Synthesis and Crystal Structure of (1-Naphthyl){[3- (2,6-dibromo-4-methylphenylimino)methyl]-5-chloro- 2-hydroxy-benzaldehyde}(triphenylphosphine) Nickel(II) Triphenylphosphine

1INTRODUCTION Over the past decades,olefin oligomerization and polymerization based on late transition metal catalysts have been the most exciting developments in the area of organometallic chemistry and polymer science[1～3].In this broad context,neutral nickel(II)complexes have attracted much attention for their less sensitivity to protonic solvents and polar mon-mers.The most typical one is the SHOP-type cata-lyst[4～6],which contains an anionic[P,O]chelate ring and shows high activ…     

基于氨硼烷的直接转移氢化反应研究进展

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.