Cyclopentadienyl manganese carbonyl

The oxidative addition of silicon hydride to cyclopentadienyl manganese carbonyl also provide a convenient route to chiral complexes (213,250) (eq. [78]). 

As regards the similarity with simple coordination of two-electron ligands, it is of interest to discuss the oxidative addition of silicon hybrid to methyl cyclopentadienyl-manganese carbonyl and the nature of the bonding in the adduct. Hydrido silyl-manganese complexes were first prepared by Jetz and Graham according to... 

Manganese carbonyl, Mn2(CO)io, when treated with tetracyclone at 140-150°, gives an air-sensitive product which on hydrolysis gives the T-cyclopentadienyl complex (LII) 215). Manganese carbonyl does not react with dimcthylacetylene in sunlight, but duroquinone was formed in a similar reaction of the alkyne with [Mn(CO)6] 1 155). Mn(—1) is iso-electronic with Fe(0), and it is suggested that the unstable quinone com-... 

Manganese carbenes, preparation, 5, 825 Manganese carbonyl complexes with 776-arene complexes, 5, 787 cyclopentadienyl complexes, 5, 783 with hydrocarbon ligands, complexes, 5, 776 synthesis and characteristics, 5, 761 Manganese carbonyl halides, applications and reactivity,... 

Optically active organometallic compounds in which the transition metal is the center of chirality have been known since 1969, when the first manganese compounds were reported1. In the meantime cyclopentadienyl and carbonyl transition metal complexes with 4, 5 and 6 ligands have been obtained in optically active form for the following types of compounds (Scheme 1) ... 

TABLE I Infrared Carbonyl Stretching Frequencies for Cyclopentadienyl Manganese and Rhodium Complexes"... 

Further examples include homo-, co- and terpolymers of manganese carbonyl, iron carbonyl or cyclopentadienyl, and ruthenium-phosphine complexes [31, 59, 60]. 

Transition metal organometallic complexes like dicarbonyl cyclopentadienyl iron [128], tricarbonyl cyclopentadienyl manganese [129] and iron-arene complexes [130,131] have also been reported as photoinitiators for photochemical crosslinking of cyanate esters. Photosubstitution of carbonyl groups by -OCN during irradiation initiates the reaction in the former case whereas photochemical dissociation of arene triggers it in the latter system. 

The first transition metal complex containing four different substituents to be resolved was the manganese complex shown in Scheme 2, top [6,7]. In the cation of this complex, the Mn atom is surrounded by a cyclopentadienyl, a carbonyl, a nitrosyl, and a triphenylphosphine ligand. This complex can be prepared from the commercially available compound (C5H5)Mn(CO)3 in two steps yielding [(C5H5)Mn(CO)(NO)PPh3]PF6 as a racemate [8]. 

Cl gHi 4Fe20y, Hexacarbonyl (m ( (1,2,3-tj 3,4,5-t )-2-(1,1-dimethyleth-yl)-4-methy1-1-0x0-2,3-pentadiene-1,5-diyl))diiron, 42B, 662 Cl gHi 4Mn203, /x Allene-iLi-carbonyl-bis(carbonyl-72 -cyclopentadienyl-manganese), 46B, 843... 

C2 6H2 2C02Mn04P, Dicarbonyl-cyclopentadienyl-manganese-M3 (benzyl-phosphido)-bis(carbonyl-cyclopentadienyl-cobalt), 45B, 980 C26H25F12N3P2V2, Bis(fulvalene)bis(acetonitrile)divanadiumUII)(V-V) bis(hexafluorophosphate) acetonitrile, 45B, 980 C2 6H2 sN2Ti, 4-Methylene-3,7,8-trimethyl-1,10-phenanthrolinebis( t -cyclopentadienyl)titanium, 46B, 902 C2 6H2 sNijTi 2, M-Pyrazole-bis(Ty -cyclopentadienyl)titanium(III), 44B, 770... 

A wide variety of additives is available to refiners to improve gasoline quality, including octane number. Although lead has been banned in most western Countries, other octane-enhancers like MMT (Methyl-Cyclopentadienyl Manganese Tri-carbonyl) are widely used. Gibbs, (1989), presents a review of the various types of additives currently employed. Oxidation inhibitors and metal deactivators are normally added in the refinery or processing plant to prevent oxidation and gum formation. Dyes for product identification and antiknock compounds can be added prior... 

Maneb Manganeselll) acetate Manganese carbonyl Manganese cyclopentadienyl tricarbonyl Manganese 2-methylcyclopentadienyl Iricarbonyl... 

Ligand substitution reactions of n-cyclopentadienyl manganese tri-carbonyl ... 

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... 

The reactions between cyclopropenes and carbon monoxide in the presence of transition metals have been of some use in synthesis,93 and in 1978 Binger initiated a study of the reactions between metal carbonyls and cyclopropenes in order to elucidate the generality of these reactions.75 It was found that dicarbonyl 775-cyclopentadienyl(tetrahydrofuran)manganese(I) reacted with 3,3-dime thy Icy clopropene at 0°C to produce -(vinylketene) complex 81 in fair yield. The only other transition metal in Binger s study that was found to react with 3,3-dimethylcyclopropene in this manner was iron (see Section VI,B). 

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