CATALYTIC HYDROGENATION OF ORGANIC SUBSTRATES
761
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for a particular substrate.
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4.1. Variation of Catalyst Concentration
10.
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Kinetic studies revealed that the initial rates of hydrogenation
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of styrene, acrylonitrile and cyclohexene were first order depen-
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17–20.
hydrogen pressure were kept constant during the variation of
the various catalyst concentrations. The results with the catalyst
[Rh(Az)(CO)2] are given in Figure 4.
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4.2. Variation of Substrate Concentration
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Initial rate of hydrogenation for all the three substrates were
found independent of substrate concentration at constant cat-
alyst concentration and hydrogen pressure. The results with
[Rh(Az)(CO)2] are given in Figure 5.
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4.3. Variation of Hydrogen Pressure
The initial rate of reduction was found to be first order depen-
dent on hydrogen pressure for all the three substrates, at constant
catalyst concentration and substrate concentration. The results
with [Rh(Az)(CO)2] are given in Figure 6.
5. CONCLUSION
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Rh(I) complexes of S-triazenes and azobenzene could be
used as active catalysts for the dihydrogen reduction of a
number of organic substrates. Among [Rh(Az)(CO)2], [Rh(OR-
T)(CO)2],
[Rh(DEt-AT)(CO)2],
[Rh(DEt-ATH2)(CO)2],
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[Rh(Az)(CO)(PPh3)], and [Rh(AzH)Cl(CO)2] the first two
were found most efficient. The rate of reduction of substrates
was found to depend both on steric and electronic factors. DMF
was found best solvent for these catalytic systems.
34. Ruiz, J.R., Sanchidria´n, C.J., Hidalgo, J.M., and Marinas, J.M. J. Mol.
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SUPPLEMENTARY MATERIALS
PMR, UV, IR spectra, and kinetic data of normal and high
pressure hydrogenation reactions, mechanism, and equation for
reduction process is available via internet.
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