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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.
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]
C 7 H 8 + Mo(CO) 6 → (C 7 H 8)Mo(CO) 3 + 3 CO. The compound is a piano stool complex, consisting of Mo(CO) 3 bound to six carbon centers of the triene. The methylene group projects from the plane of the six coordinated carbon atoms. [3] The compound reacts with trityl salts to give the cycloheptatrienyl complex: [4]
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.
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The Mortreux system consists of the molybdenum precatalyst molybdenum hexacarbonyl Mo(CO) 6 and resorcinol cocatalyst. In 1975, T. J. Katz proposed a metal carbyne (i.e. alkylidyne) and a metallacyclobutadiene as intermediates. In 1981, R. R. Schrock characterized several metallacyclobutadiene complexes that were catalytically active. [5]
W(CO) 6 behaves similarly to the Mo(CO) 6 but tends to form compounds that are kinetically more robust. Cyclopentadienyltungsten tricarbonyl dimer ((C 5 H 5.) 2 W 2 (CO) 6) is produced from W(CO) 6. Treatment of tungsten hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaW(CO) 3 (C 5 H 5) gives ...