Rhodium catalyzed hydrogen transfer redox reactions

Details Rhodium catalyzed hydrogen transfer redox reactions Rhodium catalyzed hydrogen transfer redox reactions

1991-09-18

1993-08-24

Lewis, Michael

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5302

Patent

active

052391175

ABSTRACT:
Oxidation/reduction processes catalyzed by soluble rhodium complexes of the type (L.sub.4or5 Rh)Z.sup.- wherein each L is selected from a group consisting essentially of monophosphines, diphosphines, olefins and coordinating solvents with the proviso that at least one L is a phosphine and Z is a weakly coordinating anion. In one embodiment, formic acid is produced by the hydrogenation of carbon dioxide. In another embodiment oxygen/carbon dioxide mixtures are used to oxidize organic compounds (ethers, amines, olefins) with coproduction of formic acid. In a third embodiment, these organic compounds are selectively oxidized by oxygen alone, without the coproduction of formic acid.

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Hirai, Nutton & Maitlis, "Pentamethylcyclopentadienyl-Rhodium and -Iridium Complexes". Part 27. Catalysed Oxygenation Reactions; . . . (1981).
Inoue, Isumida, Sasaki & Hashimoto, "Catalytic Fixation of Carbon Dioxide to Formic Acid by Transition-Metal Complexes Under . . ." (1976).
Schrock & Osborn, "Rhodium Catalysts for the Homogeneous Hydrogenation of Ketones", Chemical Communications (1970) pp. 567-568.
Hashimoto, Harukichi, Inoue, Yoshio, "Formic Acid and its Esters", Chemical Abstracts, vol. 87 (1977) p. 498.
Hashimoto, Shunkichi, Inoue, Yoshio, "Formic Acid and its Esters", Chemical Abstracts, vol. 88 (1978) p. 555.

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