Premium
cis‐bond‐producing hydrogenation of polyunsaturates catalyzed by polymer‐complexed Cr(CO) 3 catalysts
Author(s) -
Awl R. A.,
Frankel E. N.,
Friedrich J. P.,
Pryde E. H.
Publication year - 1978
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02667273
Subject(s) - catalysis , cyclohexane , polymer , chemistry , chromium , polymer chemistry , styrene , vanadium , double bond , organic chemistry , conjugated system , copolymer
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 of cis ‐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.