Abstract
An ESR study of 1-butene isomerization at 315/sup 0/-375/sup 0/C, 3,3-dimethyl-1-butene isomerization to 2,3-dimethyl-1- and -2-butene at 293/sup 0/K, and deuterium redistribution in 3,3-dideuteriopropene at 363/sup 0/-396/sup 0/K showed the presence of two copper(II) species in different environments, which reacted with the olefins at different rates. Although activation energies for the three reactions differed and only dideuteriopropene showed an induction period, a similar mechanism is proposed in all cases, involving preliminary reduction of copper(II), with the rates of reduction and isomerization differing from olefin to olefin. Apparently, the active site for the isomerization is a Broensted acid generated by the reduction, and the isomerization follows an associative (proton addition-elimination) mechanism with a carbonium ion intermediate. Spectra, graphs, diagram, and 12 references.
Citation Formats
John, C S, and Leach, H F.
Determination of the active site and mechanism for alkene isomerization in Cu(II) exchnaged Y-type zeolite.
United Kingdom: N. p.,
1977.
Web.
doi:10.1039/f19777301595.
John, C S, & Leach, H F.
Determination of the active site and mechanism for alkene isomerization in Cu(II) exchnaged Y-type zeolite.
United Kingdom.
https://doi.org/10.1039/f19777301595
John, C S, and Leach, H F.
1977.
"Determination of the active site and mechanism for alkene isomerization in Cu(II) exchnaged Y-type zeolite."
United Kingdom.
https://doi.org/10.1039/f19777301595.
@misc{etde_5999984,
title = {Determination of the active site and mechanism for alkene isomerization in Cu(II) exchnaged Y-type zeolite}
author = {John, C S, and Leach, H F}
abstractNote = {An ESR study of 1-butene isomerization at 315/sup 0/-375/sup 0/C, 3,3-dimethyl-1-butene isomerization to 2,3-dimethyl-1- and -2-butene at 293/sup 0/K, and deuterium redistribution in 3,3-dideuteriopropene at 363/sup 0/-396/sup 0/K showed the presence of two copper(II) species in different environments, which reacted with the olefins at different rates. Although activation energies for the three reactions differed and only dideuteriopropene showed an induction period, a similar mechanism is proposed in all cases, involving preliminary reduction of copper(II), with the rates of reduction and isomerization differing from olefin to olefin. Apparently, the active site for the isomerization is a Broensted acid generated by the reduction, and the isomerization follows an associative (proton addition-elimination) mechanism with a carbonium ion intermediate. Spectra, graphs, diagram, and 12 references.}
doi = {10.1039/f19777301595}
journal = []
volume = {73:10}
journal type = {AC}
place = {United Kingdom}
year = {1977}
month = {Jan}
}
title = {Determination of the active site and mechanism for alkene isomerization in Cu(II) exchnaged Y-type zeolite}
author = {John, C S, and Leach, H F}
abstractNote = {An ESR study of 1-butene isomerization at 315/sup 0/-375/sup 0/C, 3,3-dimethyl-1-butene isomerization to 2,3-dimethyl-1- and -2-butene at 293/sup 0/K, and deuterium redistribution in 3,3-dideuteriopropene at 363/sup 0/-396/sup 0/K showed the presence of two copper(II) species in different environments, which reacted with the olefins at different rates. Although activation energies for the three reactions differed and only dideuteriopropene showed an induction period, a similar mechanism is proposed in all cases, involving preliminary reduction of copper(II), with the rates of reduction and isomerization differing from olefin to olefin. Apparently, the active site for the isomerization is a Broensted acid generated by the reduction, and the isomerization follows an associative (proton addition-elimination) mechanism with a carbonium ion intermediate. Spectra, graphs, diagram, and 12 references.}
doi = {10.1039/f19777301595}
journal = []
volume = {73:10}
journal type = {AC}
place = {United Kingdom}
year = {1977}
month = {Jan}
}