Study of hydrogenation of olefins catalyzed by polymer-bound palladium(II) complexes
The initial hydrogenation rates in 1:1 benzene-ethanol at 25/sup 0/C and 1 atm pressure over catalysts prepared by complexing palladium chloride with diphenylphosphinated polystyrene were (in ml/min): styrene 8.10, 1-heptene 3.94, 2-heptene 0.59, cyclooctene 0.07, allylbenzene 5.10, 1,5-cyclooctadiene 0.93, 1,3-cyclooctadiene 5.26, isoprene 9.60, 1-hexyne 2.98, and phenylacetylene 3.53. Functional groups were not hydrogenated. Highest activities were obtained with oxygen-containing solvents such as dimethyl formamide, ethyl alcohol, or acetone, which solvated the catalyst species. Detailed kinetic data, measured for cyclohexene, styrene, and 1,3-cyclooctadiene resembled those of heterogeneous catalysis. Deuteration of dimethyl maleate and dimethyl fumarate with the polymer-bound palladium catalyst showed exclusively cis-deuteration. The polymer complex was much more active for olefin hydrogenation than the corresponding homogeneous catalyst, dichlorbis (triphenylphosphine) palladium(II). The higher activity of the polymer complex is attributed to lower electron density on palladium, allowing easier nucleophilic attack. Graphs, tables, spectra, and 19 references.
- Research Organization:
- Univ. of Osaka, Japan
- OSTI ID:
- 5782757
- Journal Information:
- J. Catal.; (United States), Vol. 57:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALKENES
HYDROGENATION
PALLADIUM COMPLEXES
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
DEUTERATION
EVALUATION
HETEROGENEOUS EFFECTS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
POLYSTYRENE
CHEMICAL REACTIONS
COMPLEXES
HYDROCARBONS
KINETICS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
REACTION KINETICS
SYNTHETIC MATERIALS
TRANSITION ELEMENT COMPLEXES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)