Preparation of cyclododecene
AssigneeE. I. Du Pont de Nemours and Company
InventorKathryn M. Sanchez
Life of this patent
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Abstract
Partial hydrogenation of 1,5,9-cyclododecatriene to form cyclododecene using ruthenium catalyst and a solvent selected from the group consisting of esters and ethers having a boiling point higher than 245 degrees C.
Claims5
In a process for the partial hydrogenation of 1,5,9-cyclododecatriene to cyclododecene which comprises contacting 1,5,9-cyclododecatriene, and a ruthenium ligand complex catalyst consisting essentially of RuCl.sub.2 (CO).sub.2 (PAr.sub.3).sub.3 and free triarylphosphine under hydrogenation conditions which partially reduce 1,5,9-cyclododecatriene to cyclododecene, the improvement which comprises dissolving the triene and the catalyst in a solvent selected from the group consisting of esters and ethers having a boiling point higher than 245 degrees C. that is inert under the hydrogenation conditions.
A continuous process for the partial hydrogenation of 1,5,9-cyclododecatriene to cyclododecene which comprises forming a solution containing 1,5,9-cyclododecatriene, and a ruthenium ligand complex catalyst consisting essentially of RuCl.sub.2 (CO).sub.2 (PAr.sub.3).sub.3 and free triarylphosphene dissolved in a solvent selected from the group consisting of esters and ethers having a boiling point higher than 245 degrees C., hydrogenating said triene to cyclododecene, recovering cyclododecene by distillation, and returning the solvent containing the dissolved catalyst to the step of forming a solution containing 1,5,9-cyclododecatriene.
Dependencies are inferred from the claim text.