Genre
- Journal Article
Nanosecond laser flash photolysis (lambda = 355 nm) of an aqueous solution of 3-chloro-3-p-chlorophenyldiazirine in isooctane produces a transient absorption at 310 nm due to the formation of the carbene: In the presence of 2-vinylpyridine, a second transient with a broad absorption band peaking at 520 nm grows in. This absorption is attributed to 2-vinylpyridinium ylide. The ylide decays with a lifetime equal to 33 mu s at 25 degrees C independent of the concentration of 2-vinylpyridine. As the ylide decays, there isa concomitant growth of an absorption at 330 nm, attributed to the formation of indolizine. The activation parameters for the 1,5-dipolar cyclization of the ylide to indolizine were determined; E(alpha) = 12.1 kcal mol(-1) and log A = 13.4. (C) 1994 John Wiley & Sons, Inc.
UNIV BORDEAUX 1,CHIM PHYS LAB,CNRS,URA 348,F-33405 TALENCE,FRANCE.; LIU, MTH, UNIV PRINCE EDWARD ISL,DEPT CHEM,CHARLOTTETOWN C1A 4P3,PE,CANADA.
NEW YORK; 605 THIRD AVE, NEW YORK, NY 10158-0012
JOHN WILEY & SONS INC
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Source type: Electronic(1)
Language
- English
Subjects
- Chemistry, Physical