THE NUCLEAR MAGNETIC RESONANCE SPECTRA OF TRIARYL CARBONIUM IONS

Autor:	T. M. Connor, Ross Stewart, R. B. Moodie
Rok vydání:	1959
Předmět:	Para position Nuclear magnetic resonance Carbonium ion Chemistry Organic Chemistry General Chemistry Catalysis Spectral line Ion
Zdroj:	Canadian Journal of Chemistry. 37:1402-1408
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v59-205
Popis:	The N.M.R. spectra of the triphenylmethyl cation and several of its derivatives substituted with methyl, methoxyl, and tert-butyl groups in the meta or para position have been obtained in trifluoroacetic acid – trifluoroacetic anhydride solution. The ring protons and substituent protons are all shifted to lower fields, i.e. are less shielded in the carbonium ions than in the neutral compounds of similar structure. The chemical shifts for the substituent protons are greater for para than for meta substituents and for mono- rather than tri-substituted ions. With each ion only a single peak was observed for the substituent protons but the ring protons were, in some cases, well resolved. The theoretical implications of these results are discussed.
Databáze:	OpenAIRE
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