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Transferts Protoniques de Sels d'Ammonium Substitues—VIII: Sels de Pyridinium 4-Substitues

✍ Scribed by Jean-Jacques Delpuech; Guy Serratrice

Book ID
102950634
Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
676 KB
Volume
4
Category
Article
ISSN
0749-1581

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✦ Synopsis

The deprotonation rate 1/7 of the title compounds, [4 -R -Py HI+, where R = NHz, t-Bu, Me, C1, Br or CN, is measured using the coalescence of the pyridinic u-protons, in a mixture CF,COOH/H,O/HClO, of variable acidity Ho, at 38°C. 1/7 is a linear function k/ho of the acidity l/ho. k isapproximately proportional to the water content and independent of the salt concentration, which seems to be evidence for an exchange with an intermediate pyridine hydrate, according to:

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