Carbonyls, chromium platinum-rhodium

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. 

Carbonyl groups. Breitner et al. found Engelhard Ru-C and Rh-C distinctly superior to Pl-C and Pd-C for the hydrogenation of ketones in neutral or basic medium. Hu.sek et til. iittcmpted reduction of tetramothy 1-1,3-cyclobutanedione with platinum, palladium, and rhodium catalysts but the results were very poor. With copper-chromium oxide and supported nickel culitlyilR yieldsol diols were moderate,... 

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