Takeru Onoda

Hexacarbonylbis(tricyclopentylphosphine)dirhodium and hexacarbonylbis(triisopropylphosphine)dirhodium from a catalytic system for syngas conversion to ethylene glycol

Two dimeric rhodium compounds, [Rh(CO) 3 P(c-C 5 H 9 ) 3 ] 2 ( 1 ) and [Rh)CO) 3 P(i-Pr) 3 ] 2 ( 2 ) have been isolated from the catalytic reaction mixtures of syngas conversion to ethylene glycol, and their molecular structures without a bridging carbonyl were determined by single crystal X-ray diffraction studies.

Reaktivität des hydrierungskatalystors irx(co)l2 als funktion der liganden x und l

Abstract Rectivity of the hydrogenation catalyst IrX(CO)L 2 depends on the ligands X. Reaction rate r is for X  Cl

Effective hydrogenation of carbon monoxide to ethylene glycol using rhodium-trialkylphosphine-nitrogen base catalyst: critical role of nitrogen base promoter in controlling selectivity

Br

Mononuclear tetracarbonylrhodate Rh(CO)4–. A new aspect of syngas conversion into ethylene glycol

I. This rule does not depend on the type of the unsaturated compound St. Regarding the ligands L(PR 3 ) there is no relationship between π-acceptor strength of L in IrX(CO)L 2 and reaction rate r of the catalyst.

Novel homonuclear disproportionation of [Rh(CO)3P-i-Pr3]2 induced by nitrogen bases; evidence for the existence of the homonuclear ion pair, [Rh(CO)(P-i-Pr3)2(amine)]+[Rh(CO)4]−

Abstract In the rhodium/alkylphosphine complex catalyzed hydrogenation of carbon monoxide, the reaction rate and the selectivity to ethylene glycol have been found to be much improved by the addition of nitrogen bases. Examination of the effects of a variety of nitrogen bases for Rh/P-i-Pr3 and Rh/P-n-Bu3 catalyst systems revealed the linear relationships between rate (to ethylene glycol and methanol) and pKa value of the nitrogen base. Use of these catalysts, allowed a space time yield of 280 g/l·h and a selectivity of ethylene glycol of 76% to be achieved.

A New Route to Methacrylates from Isobutyraldehyde

Syngas treatment of Rh4(CO)12 in 1-methylpyrrolidin-2-one gives a colourless solution of mononuclear tetracarbonylrhodate, Rh(CO)4–, which is closely related to the active catalytic species that produces ethylene glycol.

An acid-base catalysis in the selective decomposition of carboxylic acids

Abstract The single RhRh bond, in the dimeric rhodium(0) complex [Rh(CO) 3 P-i-Pr 3 ] 2 , has been found to undergo facile homonuclear disproportionation which in the presence of a nitrogen base, e.g. triazole, imidazole or 4-aminopyridine, gives the homonuclear ion pair, [Rh(CO)(P-i-Pr 3 ) 2 (B)] + [Rh(CO) 4 ] − .

PROCESS FOR PREPARING HETEROPOLY-ACIDS

A new synthetic route to MMA from isobutyraldehyde is now planned commercialization. This process is characterized in its unique source material, isobutyraldehyde. Another point to be stressed is the use of the heteropoly acid catalyst for the oxidative dehydrogenation of the intermediate isobutyric acid to methacrylic acid. The characteristic of this proprietary MCI catalyst is summarized. The outlines of the MCI (Mitsubishi Chemical Industries Ltd.) process are described.