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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 1, Number 4
BKCSDE 1(4)
April 20, 1980 

 
Title
Photocycloaddition Reaction of 1,2-Bispyrazylethylene to Tetracyanoethylene
Author
Sang Chul Shim, Hyun-Kwan Shim
Keywords
Abstract
Benzene solution oftrans-1,2-bispyrazylethylene and electron deficient olefin, tetracyanoethylene, as a π-acceptor gave 1,2-bispyrazyl-3,3,4,4-tetracyanocyclobutane, a 2π + 2π cycloaddition product, on irradiation with 350 nm UV light. Fluorescence studies revealed the reaction to proceed through a singlet exciplex. The fluorescence of trans-1,2-bispyrazylethylene was quenched very efficiently by tetracyanoethylene with the quenching constant of 1.6 × 1010M-1s-1 while electron rich olefin, tetramethylethylene, did not quench the fluorescence of bispyrazylethylene.
Page
123 - 126
Full Text
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