Catalytic isomerization of ethylenic hydrocarbons. XII. Isomerization of 2-butenes selectively deuterated in the allylic and vinylic positions over alumina and silica-alumina. [Deuterium isotope effects]

Journal Article · Thu Jan 01 04:00:00 EST 1976 · J. Catal.; (United States)

OSTI ID:7122798

Perot, G; Guisnet, M; Maurel, R

The isomerization of 2,3-d/sub 2/- and 1,4-d/sub 6/-cis-butenes was carried out on alumina and silica-alumina catalysts. Over both catalysts, double-bond shift is closely related to exchange between the allylic hydrogens of the reactant and the catalyst. On the other hand, it becomes apparent from the reported data that cis-trans isomerization proceeds through two different paths: a mechanism (I) involving exchange between the catalyst and the vinylic hydrogens of the reactant and an ''intramolecular'' mechanism (II) without any exchange between the reactant and the catalyst. It is shown that both double-bond shift and cis-trans reaction by mechanism I can occur on the two catalysts by a stereospecific carbonium ion mechanism while mechanism II is not fully understood.

• Research Organization: Universite de Poitiers, France
• OSTI ID: 7122798
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 41:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400302* -- Organic Chemistry-- Isotope Effects-- (-1987)
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEUTERIUM
ETHYLENE
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES