Synthesis and Reactivity of Group 6 Metal Carbonyl Complexes Containing Bis(3,5-dimethyl-4-benzylpyrazol-1-yl)methane

Abstract

Abstract: Bis(3,5-dimethyl-4-benzylpyrazo-1-yl)methane, CH₂(3,5-Me₂-4-BzPz)₂, is synthesized by the reaction of 3,5-dimethyl-4-benzylpyrazole with CH₂Br₂ under phase transfer catalysis, which reacts with M(CO)₆(M=Cr, Mo or W) under UV irradiation at room temperature to yield bis(3,5-dimethyl-4-benzylpyrazo-1-yl)methane tetracarbonyl chromium, molybdenum or tungsten complex, respectively. Treatment of bis(3,5-dimethyl-4-benzylpyrazo-1-yl)methane tetracarbonyl molybdenum or tungsten with SnCl₄ gives the Mo(W)—Sn heterobimetallic complexes in good yields. The molecular structure of CH₂(3,5-Me₂-4-BzPz)₂W(Cl)(CO)₃(SnCl₃) determined by X-ray crystallography shows that the six-membered W—N—N—C—N—N metallacycle is in a boat form, and no chlorine bridge is observed. The compound crystallizes in the triclinic space group P1, with a=1.0929(9) nm, b=1.282(1) nm, c=1.282(1) nm, α=102.35(1)°, β=108.62(1)°, γ=97.00(1)°, V=1.799(3) nm³, Z=2, R=0.058, wR=0.1015.

Key words: Poly(pyrazo-1-yl)alkane, Group 6 metal carbonyl complex, Heterobimetallic complexes, Crystal structure

CLC Number:

O641

TrendMD:

WANG Zhi-Hong, TANG Liang-Fu, YANG Zhi, WANG Ji-Tao. Synthesis and Reactivity of Group 6 Metal Carbonyl Complexes Containing Bis(3,5-dimethyl-4-benzylpyrazol-1-yl)methane[J]. Chem. J. Chinese Universities, 2002, 23(9): 1715.

References

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