rates of all the isomerization reactions; the cis-and transisomers are simply indicated as lumped in Equation 4. The important result here is that the secondary isomerization step (Equation 4) is not immeasurably fast compared with the primary dealkylation step (Equation 3), but rather the rates are commensurable under the conditions of ester dealkylation over an acidic catalyst. The rate constants measured by the slopes of the lines in Figure 3 pertain to ky in Reaction 3, since all the butenes are lumped in the computation of conversion.If the simplified schematic indicated by Equations 3 and 4 is correct, we may expect in general that different activation energies would characterize the two reactionsfor example, Hightower et al. (1967) on the isomerization kinetics of 1-butene over fluorided alumina. If this occurs, the extent of secondary isomerization would be different at the two temperatures, for a given conversion. Our data bear out this expectation, although the effect is not great. At a conversion of about SOU, for example, the butenes produced at 178.5°C contained about 26' --butene; for the same conversion at 189°C they contained about 33'7 1-butene. A similar, small difference was
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.