Cyclohexene homogeneous catalysis

CO oxidation, 38 236 differential heat of adsorption, 38 217 Biphasic systems, catalysis see Multiphase homogeneous catalysis BiPMo catalysts, 34 39 in formamide to nitrile reaction, 34 39 Bi-postdosing thermal desorption spectroscopy cyclohexene, 42 240... 

A recent paper by Kwiatek and co-workers1891 discloses the use of a homogeneous catalysis system for the hydrogenation of epoxides. Reduction of cyclohexene oxide to cydohexanol, and of styrene oxide to 2-phenylethanol, was carried at atmospherio pressure, using Ks[Co(CN) ] to catalyze the reaction. 

Stimson and co-workers have made a detailed study of the homogeneous catalysis of olefin elimination from alcohols and the results are shown in Table 14. No induction periods were observed and cyclohexene and... 

However, styrene and cyclohexene gave complex product mixtures, and 1-octene did not react under the same reaction conditions. Thus, the activity of this catalyst is intrinsically low. Jacobs and co-workers [159,160] applied Veturello s catalyst [PO WCKOj ]3- (tethered on a commercial nitrate-form resin with alkylammonium cations) to the epoxidation of allylic alcohols and terpenes. The regio- and diastereoselectivity of the parent homogeneous catalysts were preserved in the supported catalyst. For bulky alkenes, the reactivity of the POM catalyst was superior to that of Ti-based catalysts with large pore sizes such as Ti-p and Ti-MCM-48. The catalytic activity of the recycled catalyst was completely maintained after several cycles and the filtrate was catalytically inactive, indicating that the observed catalysis is truly heterogeneous in nature. 

Cyclohexene hydrogenation was catalyzed by Mo-Co clusters of different structural types. j jjg mixed-metal clusters 7-9 have been tested as homogeneous catalysts for the hydroformylation of 1-pentene and styrene. Isomerization of 1-pentene competes with hydroformylation to hexanal and 2-methylpentanal. Hydroformylation of styrene was achieved under mild conditions with moderate to high branched-to-normal selectivity when cluster 8 was employed. These clusters could be recovered in high yield (>90 X)) after catalysis. ... 

Very little seems to have been reported on the use of W-Ni clusters in catalysis. Cage-type clusters were, however, found to be very active in homogeneous cyclohexene hydrogenation and HDS reactions. The results indicated the promoting role of Ni. ... 

Tumas and coworkers (238) have investigated the oxidation of cyclohexene using molecular oxygen catalyzed by halogenated iron porphyrins in SCCO2. The authors note that homogeneous oxidation catalysis in SCCO2 remains relatively unexplored, despite the attractive features afforded by this solvent, such... 

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