Syntheses and characterization of tetrakis(5-tert-butylpyrazole) Fe(II) and Mn(II) complexes. Molecular structure of Fe(Pzt-Bu)4(OTF)2
摘要:
Dichlorotetrakis(5-t-butylpyrazole)iron (1), dichlorotetrakis(5-t-butylpyrazole) manganese (2), and tetrakis(5-t-butylpyrazole) iron(II) bis(trifluoromethanesulfonate) (3) were prepared and characterized. The crystal structure of 3 was determined from X-ray diffraction data. Complex 3 has a distorted octahedral structure with the two triflate ligands at mutually trans positions. Complexes 1 and 2 are mild catalysts for the selective epoxidation of styrene and norbornylene. In comparison, complex 3 is an efficient catalyst for the epoxidation of norbornylene, but promotes the oxidation of styrene predominantly to benzaldehyde. (C) 1999 Elsevier Science Ltd. All rights reserved.