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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.
A perfect octahedron belongs to the point group O h. Examples of octahedral compounds are sulfur hexafluoride SF 6 and molybdenum hexacarbonyl Mo(CO) 6. The term "octahedral" is used somewhat loosely by chemists, focusing on the geometry of the bonds to the central atom and not considering differences among the ligands themselves.
The six CO ligands are terminal and the Mo-Mo bond distance is 3.2325 Å. [2] The compound is prepared by treatment of molybdenum hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaMo(CO) 3 (C 5 H 5). [3] Other methods have been developed starting with Mo(CO) 3 (CH 3 CN) 3 instead of Mo(CO) 6. [4]
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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 ...
(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.
2 Mo(CO) 6 + 4 HO 2 CCH 3 → Mo 2 (O 2 CCH 3) 4 + 12 CO + 2 H 2. Trinuclear clusters are byproducts. [7] The reaction of HO 2 CCH 3 and Mo(CO) 6 was first investigated by Bannister et al. in 1960. At the time, quadruple metal-metal bonds had not yet been discovered, so these authors proposed that Mo(O 2 CCH 3) 2 was tetrahedral.
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