Molybdenum bromide 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 action of carbon tetrachloride or a mixture of chlorine with a hydrocarbon or carbon monoxide on the oxide.—H. N. Warren 9 obtained aluminium chloride by heating the oxide to redness with a mixture of petroleum vapour and hydrogen chloride or chlorine, naphthalene chloride or carbon tetrachloride was also used. The bromide was prepared in a similar manner. E. Demarpay used the vapour of carbon tetrachloride, the chlorides of chromium, titanium, niobium, tantalum, zirconium, cobalt, nickel, tungsten, and molybdenum H. Quantin, a mixture of carbon monoxide and chlorine and W. Heap and E. Newbery, carbonyl chloride. 

Scheme 2.29 depicts two of the first examples of microwave-assisted carbonylation reactions7. In these reactions, the temperature controls the rate of the CO release. Thus, during heating at 150°C in sealed vessels, carbon monoxide was smoothly emitted from the molybdenum carbonyl complex into the reaction mixture (Fig. 2.1, Profile A). As a result, aryl iodides and bromides underwent efficient amino carbonylation with non-hindered, aliphatic, primary and secondary amines in only 15 min, using Herrmann s palladacycle as pre-catalyst7 (Scheme 2.29). In contrast, at a reaction temperature of 210°C, carbon monoxide was liberated almost instantaneously (Fig. 2.1, Profile B).

Dienes Allyldiphenylphosphine. Bromo-methanesulfonyl bromide. 1,3,3a,4,7,7a-Hexahydro-4,7-methanobenzo [c] thiophene 2,2-dioxide. Molybdenum carbonyl. Nickel(II) chloride-Zinc. 3-Sulfolene. Te-trakis(triphenylphosphine)palladium. 

Vanhoye and coworkers [402] synthesized aldehydes by using the electrogenerated radical anion of iron pentacarbonyl to reduce iodoethane and benzyl bromide in the presence of carbon monoxide. Esters can be prepared catalytically from alkyl halides and alcohols in the presence of iron pentacarbonyl [403]. Yoshida and coworkers reduced mixtures of organic halides and iron pentacarbonyl and then introduced an electrophile to obtain carbonyl compounds [404] and converted alkyl halides into aldehydes by using iron pentacarbonyl as a catalyst [405,406]. Finally, a review by Torii [407] provides references to additional papers that deal with catalytic processes involving complexes of nickel, cobalt, iron, palladium, rhodium, platinum, chromium, molybdenum, tungsten, manganese, rhenium, tin, lead, zinc, mercury, and titanium. 

In the presence of molybdenum hexacarbonyl a variety of acyl sulfonamides have been formed in high to excellent yields with aryl bromides or iodides as aryl precursors using controlled MW irradiation for 15 min at 110-140 °C (Scheme 15.79) [151]. Under these conditions, primary sulfonamides reacted readily, whereas N-methylated sulfonamides afforded lower yields and incomplete conversions. The use of this carbonylation method in a key transformation step enabled an efficient synthesis of a novel hepatitis C virus NS3 protease inhibitor [Ki = 85 mvi). 

Magnesium arsenide Martonite Methyl bromide Methyl fluoride Methyl mercaptan Methyl sulfate Molybdenum fluoride Nickel carbonyl Nitrogen peroxide Nitrogen trifluoride Nitrosomethylurethane Oleum (fuming sulfuric acid) Oxygen difluoride Paranitro benzyl chloride... 

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