IN-SITU C-13 NMR-STUDY OF TERT-BUTANOL INTERACTION WITH MODERATELY CONCENTRATED SULFURIC-ACID

Citation
Vb. Kazansky et al., IN-SITU C-13 NMR-STUDY OF TERT-BUTANOL INTERACTION WITH MODERATELY CONCENTRATED SULFURIC-ACID, Catalysis letters, 29(3-4), 1994, pp. 311-323
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
1011-372X
Volume
29
Issue
3-4
Year of publication
1994
Pages
311 - 323
Database
ISI
SICI code
1011-372X(1994)29:3-4<311:ICNOTI>2.0.ZU;2-V
Abstract
An in situ NMR study of tert-butanol dehydration in 95 and 85% sulfuri c acid did not indicate the formation of tert-butyl cations as active reaction intermediates. Instead, only NMR lines from oxonium ions unde r the condition of fast exchange with water and the acid were observed . It is most likely that, in the concentrated acid, the active interme diates of this reaction are represented by tert-butyl sulfuric ester w hich probably is a precursor of invisible tert-butyl carbenium ions re presenting short-lived excited or transition states.