Simple, Tunable Aziridination Catalysts Based on Poly(pyrazolyl)borate−Copper Complexes
摘要:
[GRAPHICS]The in situ generation of a copper-poly(pyrazolyl)borate complex from copper chloride and a sodium poly(pyrazolyl)borate salt results in a catalyst that is effective for the aziridination of olefins, A significant influence of the combination of the starting copper oxidation state and the hapticity of the poly(pyrazolyl)borate ligand on the efficiency of the reaction has been observed.
Severe distortion of π-allyl orientation in a molybdenum complex containing a sterically demanding ligand: Crystal structure of hydrotrix(3,5-dimethylpyrazolyl)borato-(π-cinnamyl)-dicarbonyl molybdenum(II)
作者:Vijaya S. Joshi、Kashinath M. Sathe、Malay Nandi、Pinak Chakrabarti、Amitabha Sarkar
DOI:10.1016/0022-328x(94)05080-u
日期:1995.1
Steric interaction between terminal allyl substituent and the proximal 3-methyl group of the pyrazole can result in a severedistortion of the π-allyl orientation, as diagnosed by the downfield chemical shift of the central proton of the allyl group and confirmed by the X-ray crystal structure of a π-cinnamyl complex of molybdenum containing hydrotris-(3,5-dimethylpyrazolyl)borate ligand.