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By Boschke F.L.

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C_-coc f e e t - e l > C=C--C--C /l t c / c c-c > II II LC-- C - - C - - C J C C--C--C The transition state formed b y opposite alignment o f the reacting molecules disassociates into product molecules that are the same as the reacting olefins. g. 2-butene, the product will also be the same as the reactant. , 2-butene and 1-butene, will be Type 11 reactions and the product will be longer and shorter chain olefins. C--C=C--C C--C--C--C 7--+ <, C---C--C--C C--C C--C II I] C C--C--C Statistically, the rate of formation of new olefins for Type II reactions, except in some cases involving branched olefins, is twice the rate for Type I reactions; both alignments of the double-bond isomers to form the transition state will result in products different from the reactants.

Catalysis 3, 25 (1964). 115) Cassidy, H. , Kun, K. : Oxidation-reduction Polymers; Redox Polymers. Interscience, New York (1965). 116) Chelate Polymers Give New Redox Route. Chem. Eng. News, April 2, 1962, p. 48. 117) Allan, G. , Neogi, A. : Macromolecular Organometallic Catalysis. J. Phys. Chem. 73, 2093 (1969). 118) Mobil Oil: Proc6d6 de Mise en Oeuvre de Reactions Catalys6es par und Compl~xe R6sine-Metal' Belgian Patent 721,696 (1969). 119) I. C. : Verfahren zur Oligomerisation yon Olefinen.

L. Banks Type III A + B < r P + Q (or to2P) 1-Butene + 2-Pentene < > Propylene + 3-Hexene Ethylene + 2-Pentcne < ) Ptopylene + 1-Butene Ethylene + 2-Butene '< ~ 2 Propylene As in the case with some Type II reactants, certain Type III reactants yield two sets o f products. F o r example: (a + b) Propylene § (a + b) 2-Methyl-2-pentene ~ a (1-Butene + 2-Methyl-2-butene) + b (Isobutene + 2-Pentene) Reverse o f Type I and II reactions are Type III reactions. As stated in the introduction, abundant experimental data and mechanistic studies indicate that these catalytic disproportionation reactions proceed in accordance with a reaction scheme that can be pictured as follows: R2 R 3 i I R1--C=C--R4 ) < Rs--C=C--R s I I R6 R7 L R6 R7 J R6 R7 where the R's are hydrocarbon groups or hydrogen and the brackets indicate a transition state.

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Catalysis by Boschke F.L.


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