Manganese compounds cyclopentadienyl derivatives

An interesting compound, cyclopentadienyl(manganese tricarbonyl) copper, was obtained from the boronic acid derivative on treatment with copper(II) acetate in aqueous 2% sodium hydroxide (209). 

In a similar manner, Jt-allyl complexes of manganese, iron, and molybdenum carbonyls have been obtained from the corresponding metal carbonyl halides [5], In the case of the reaction of dicarbonyl(r 5-cyclopentadienyl)molybdenum bromide with allyl bromide, the c-allyl derivative is obtained in 75% yield in dichloromethane, but the Jt-allyl complex is the sole product (95%), when the reaction is conducted in a watenbenzene two-phase system. Similar solvent effects are observed in the corresponding reaction of the iron compound. As with the cobalt tetracarbonyl anion, it is... 

An example of environmental speciation involves the determination of the manganese containing fuel additive, methylcyclopentadienyl manganese tricarbonyl (MMT), and its derivative, cyclopentadienyl manganese tricarbonyl (CMT). As discussed above, the toxicity of this compound and concerns about human exposure to inhaled manganese have raised concerns about the widespread use of this compound in gasoline. Instrumentation for this work (Figure 1) involved the combination of LC coupled with... 

The wide substrate tolerance of HLADH encompassing nonnatural compounds is demonstrated by the resolution of organometallic derivatives possessing axial chirality [796]. For instance, the racemic tricarbonyl cyclopentadienyl manganese aldehyde shown in Scheme 2.118 was enantioselectively reduced to give the (7 )-alcohol and the residual (5)-aldehyde with excellent optical purities [797]. 

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