Synthesis and Reactivity of Group 6 Metal Carbonyl Complexes Containing Bis(3,5-dimethyl-4-benzylpyrazol-1-yl)methane
WANG Zhi-Hong, TANG Liang-Fu, YANG Zhi, WANG Ji-Tao
2002, 23(9):
1715-1718.
Asbtract
(
)
PDF (158KB)
(
)
Related Articles |
Metrics
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.