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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 8
BKCSDE 25(8)
August 20, 2004 

 
Title
Interconversion of Electronic Spin State of p-Substituted Arylketocarbene Reactions
Author
Dae Dong Sung*, Jin Hee Jeong, Zoon Ha Ryu, Won Bae Chin, Ikchoon Lee
Keywords
Arylketocarbenes, Singlet-triplet interconversion, Photolytic rate constant
Abstract
Rate constants for photolytic reactions of p-substituted 2-diazopropiophenones were determined in acetonitrile. The reactions show a comparatively low value of activation energy and activation enthalpy to alkylcarbenes or other arylcarbenes. The transition state corresponds to the step of a new carbonyl bond formation. The high negative ρ-values are shown in Hammett plots. The kinetics results and EPR spectrum are in accord with a phenomenon that occurs in interconversion between singlet and triplet carbenes.
Page
1231 - 1237
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