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Molybdenum hexacarbonyl is a popular reagent in academic research. [6]One or more CO ligands can be displaced by other ligands. [7] Mo(CO) 6, [Mo(CO) 3 (MeCN) 3], and related derivatives are employed as catalysts in organic synthesis for example, alkyne metathesis and the Pauson–Khand reaction.
Mo(CO) 6 reacts with arenes to give piano-stool complexes such as (mesitylene)molybdenum tricarbonyl. Cycloheptatrienemolybdenum tricarbonyl, which is related to (arene)Mo(CO) 3, reacts with trityl salts to give the cycloheptatrienyl complex: [3] (C 7 H 8)Mo(CO) 3 + (C 6 H 5) 3 C + → [(C 7 H 7)Mo(CO) 3] + + (C 6 H 5) 3 CH Structure of ...
Vanadium hexacarbonyl is the inorganic compound with the formula V(CO) 6. It is a blue-black volatile solid. This highly reactive species is noteworthy from theoretical perspectives as a rare isolable homoleptic metal carbonyl that is paramagnetic. Most species with the formula M x (CO) y follow the 18-electron rule, whereas V(CO) 6 has 17 ...
The M-CO and MC-O distance are sensitive to other ligands on the metal. Illustrative of these effects are the following data for Mo-C and C-O distances in Mo(CO) 6 and Mo(CO) 3 (4-methylpyridine) 3: 2.06 vs 1.90 and 1.11 vs 1.18 Å. [5]
(Mesitylene)molybdenum tricarbonyl arises from the reaction of molybdenum hexacarbonyl with hot mesitylene: [1]. Mo(CO) 6 + (CH 3) 3 C 6 H 3 → Mo(CO) 3 [(CH 3) 3 C 6 H 3] + 3 CO It can also be synthesized, with good yields by displacement of pyridine ligands of the trispyridine complex Mo(CO) 3 (pyridine) 3 in the presence of Lewis acids.
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VCl 3 (THF) 3 + 3 LiC 6 H 2-2,4,6-Me 3 → V(C 6 H 2-2,4,6-Me 3) 3 (THF) + 3 LiCl This species binds CO and, under appropriate conditions, N 2 . V( mesityl ) 3 adds a fourth mesityl group and the resulting "ate complex" can be oxidized to the vanadium(IV) derivative:
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