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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 11
BKCSDE 31(11)
November 20, 2010 

 
Title
Correlation of the Rates of Solvolysis of t-Butyl Fluoroformate Using the Extended Grunwald-Winstein Equation
Author
Yong Woo Lee, Mi Hye Seong*, Jin Burm Kyong*, Dennis N Kevill
Keywords
t-Butyl fluoroformate, Grunwald-Winstein equation, Alkyl haloformate esters, Ionization pathway
Abstract
The specific rates of solvolysis of t-butyl fluoroformate (1) have been measured at 40.0 oC in 21 pure and binary solvents. These give a satisfactory correlation over the full range of solvents when the extended Grunwald-Winstein equation, with incorporation of the solvent nucleophilicity and the solvent ionizing power, is applied. The actual values are very similar to those obtained in earlier studies of the solvolyses of isopropyl chloroformate and ethyl chlorothioformate in the more ionizing and least nucleophilic solvents, which are believed to proceed by an ionization pathway. The small negative values for the entropies of activation are consistent with the ionization nature of the proposed rate-determining step. These observations are also compared with those previously reported for the corresponding primary and secondary alkyl haloformate esters.
Page
3366 - 3370
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