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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 8, Number 4
April 20, 1987 

Kinetics of the 1,3-dipolar Cycloaddition of p-substituted 3-phenylsydnones with DMAD
Byoung Hee Youn*, Hak Soo Lyu, Jee Hyun Han, Soon Jong Hahn, Sun Hwan Kim
The kinetics of the 1,3-dipolar cycloaddition of p-substituted 3-phenylsydnones 1a-d with DMAD have been investigated. The reaction rates over a temperature range 100-140℃ were measured by UV spectrometry. The reactions found to be second-order overall, insensitive to the dielectric constants of the solvents, and characterized by a large entropy of activation. These findings are consistent with the rate-determining step involving the formation of cyclic transition state 1 and the reaction proposed to be concerted.
233 - 235
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