cis-bond-producing hydrogenation of polyunsaturates catalyzed by polymer-complexed Cr(CO)3 catalysts |
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Authors: | R A Awl E N Frankel J P Friedrich E H Pryde |
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Affiliation: | (1) Northern Regional Research Center, Federal Research, Science and Education Administration, U.S. Department of Agriculture, 61604 Peoria, Illinois |
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Abstract: | cis-Bond-producing chromium carbonyl catalysts were prepared by complexing conventional or macroreticular, styrene-divinylbenzene
copolymers or cross-linked poly (vinyl benzoate) with Cr(CO)6. With one exception, these polymer-Cr(CO)3 catalysts were as selective as the corresponding homogeneous arene-Cr(CO)3 complexes for the formation ofcis-monoenes from methyl sorbate and from conjugated, polyunsaturated fatty esters in cyclohexane. Although several of the polymer
catalysts were very active when fresh, they all lost activity on recycling. They could not be recycled more than two times
before a marked decrease in activity occurred due to loss of Cr, as shown by elemental analysis and infrared absorption in
the recovered catalyst. Thermal analysis indicated instability of the polymer complexes at hydrogenation temperatures. |
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