
Full text loading...
This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.
I accept this policy
Find out more here
Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.
The relative importance of competitive activation pathways for n-butane in HF-SbF5 superacid has been studied in a flow reactor over the -15 °C to +15 °C temperature range. In order to inhibit the reversible protide transfer between the hydrocarbon and the carbenium ions generated in the superacid solution, all experiments were run in the presence of carbon monoxide, thereby converting the reactive ions into stable oxocarbenium ions. Analysis of the product distribution between gas and acid phases identifies the main activation step as being protolytic cleavage of the central C-C bond, forming ethane and the ethyl cation. The secondary butyl cation is formed via hydride abstraction from n-butane by the primary ions formed in the first step. No isomerization of n-butane was noticed under these conditions. Fast reversible protonation of the σ-bonds of n-butane is evidenced by observation of significant protium-deuterium exchange in the "recovered" alkane when DF-SbF5 was used as superacid.