✦ LIBER ✦

Kinetics and mechanism of the reaction of aqueous sulfite with N-chloroalanylalanylalanine

✍ Scribed by William D. Stanbro; Michael J. Lenkevich

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 341 KB
Volume: 16
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550160307

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✦ Synopsis

The rate of the reaction of aqueous sulfite with the N-chloropeptide N-chloroalanylalanylalanine has been studied as a function of pH, temperature, and ionic strength. The results of this work suggest that the mechanism of the reaction involves the interaction of the neutral chloramine with the three ionic forms of sulfite, SO;', HSO;, and H,S03, with the rate of reaction increasing rapidly with increasing protonation. The estimated second-order rate constants for each ionic species as a function of temperature are H,SO, HSO; SO;' k , = 2.00 x 10' exp( -1544/RT) min-' k, = 4.35 x lo4 exp(-1170/RT) min-' k , = 1.58 x 10" exp( -12,66O/RT) min-'

where the activation energies are in units of cal/mol.

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