ChemInform Abstract: An Immobilized Homogeneous Catalyst for Efficient and Selective Hydrogenation of Functionalized Aldehydes, Alkenes, and Alkynes.

Burk, Mark J.; Gerlach, Arne; Semmeril, David

doi:10.1002/chin.200119059

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2003

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“…Recently, an immobilised cationic rhodium(I) catalyst bearing the diphosphine 1,1'-bis(diisopropylphosphino)ferrocene as ligand has been proposed. [2,3] In spite of the good stability of the complex, some leaching of Rh was observed in the first runs, and these Rh(DiPFc)/Al 2 O 3 catalysts are extremely expensive.…”

Section: Introductionmentioning

confidence: 96%

Base‐Catalysed Hydrogenation of Sulphur‐Containing Aldehydes

Kumbhar²,

Figuéras

2003

Adv Synth Catal

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The present work reports the first selective catalytic hydrogenation of bifunctional compounds containing a carbonyl and sulphur moieties, using hydrogen transfer from alcohols and a basic catalyst. The reaction was performed in batch at 371 K at atmospheric pressure with 3-mercaptopropionaldehyde, thiophene-2-carboxaldehyde, 5-bromothiophene-2-carboxaldehyde and 4-methylthiobenzaldehyde. The only product of reaction was the alcohol, formed with yields > 80%, except with 3-mercaptopropionaldehyde which did not give the alcohol but rather afforded unidentified heavy products. 5-Bromothiophenemethanol was obtained with 100% yield in 3 h. The reaction obeys a mechanism of competitive adsorption of the reactants, and the reaction rates are higher than those reported for supported rhodium catalysts.

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Section: Introductionmentioning

confidence: 96%