Collection of Czechoslovak Chemical Communications p. 2583 - 2592 (1992)
Update date:2022-08-16
Topics:
Krupickova, Jana
Vcelak, Jaroslav
Hetflejs, Jiri
Kinetics of the title reactions has been studied, using nickel(II) 2,4-pentanedionate/triethylaluminium system as a model catalyst.Initial rate measurements showed that in both cases the hydrogenation is first order in hydrogen, zero order in the octadecenoate and a fractional order (close to one) in the catalyst.Both hydrogenations have similar activation energies (30.2 +/- 2.3 kJ mol-1 and 28.9 +/- 2.6 kJ mol-1 for the (Z)- and (E)-9-octadecenoate, respectively).Based on these data and the results of competition experiments, two models have been proposed to describe isomerization of the octadecenoates (either direct of via an intermediate).
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