ISSN:
0894-3230
Keywords:
Organic Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Kinetic studies were carried out on the thermal epimerization by pyramidal inversion of optically active (S)-(-)Se- and (R)-(+)Se-4-[(-)-menthyloxycarbonyl]phenyl(2′,4′,6′-triisopropylphenyl)selenonium-N-toluene-4″-sulphonimides (1). The first-order rate constants for the pyramidal inversion of (S)-(-)Se-1 and (R)-(+)Se-1 were determined and the activation enthalpies and entropies were calculated. A fairly large difference was found in the activation parameters between optically active (S)-(-)Se-1 and (R)-(+)Se-1, i.e. a large negative activation entropy was obtained in the case of (R)-(+)Se-1.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/poc.610080303
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