摘要:
Compound MoO2Cl2(THF)(2) reacts with two equivalents of 1,3-dialkyl substituted 4,5-dimethylimidazol-2-ylidenes to give the dioxomolybdenum(VI) complexes MoO2Cl2(L-R)(2) [R = Me (1), i-Pr (2)]. Treatment of MoO2Cl2(THF)(2) with one equivalent of the N-heterocyclic carbenes L-Me, Li-Pr and L-Cl(n-Bu) (L-Me =1,3,4,5-tetramethylimidazol-2-ylidene, Li-Pr = 1,3-diisopropyl-4,5dimethylimidazol-2-ylidene, and L-Cl(n-Bu) = 1,3-dibutyl-4,5-dichloroimidazol-2-ylidene) affords the monocarbene adducts MoO2Cl2(LR) [R = Me (3), i-Pr (4)] and MoO2Cl2(L-C1(n-Bu)) (5), respectively. Decomposition of complexes 1-5 affords a molybdenum oxychloride anion [Mo2O5Cl4](2-) as an imidazolium salt. (c) 2006 Elsevier B.V. All rights reserved.