Bulletin of the Korean Chemical Society

  • 제1권4호
  • /
  • Pages.123-126
  • /
  • 1980
  • /
  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Photocycloaddition Reaction of 1,2-Bispyrazylethylene to Tetracyanoethylene

  • Shim, Sang-Chul (Department of Chemistry, Korea Advanced Institute of Science) ;
  • Shim, Hyun-Kwan (Department of Chemistry, Korea Advanced Institute of Science)
  • 발행 : 1980.12.30
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초록

Benzene solution of trans-1,2-bispyrazylethylene and electron deficient olefin, tetracyanoethylene, as a ${\pi}$-acceptor gave 1,2-bispyrazyl-3,3,4,4-tetracyanocyclobutane, a 2${\pi}$ + 2${\pi}$ 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 ${\times}$ 10$^{10}$M$^{-1}$s$^{-1}$ while electron rich olefin, tetramethylethylene, did not quench the fluorescence of bispyrazylethylene.

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참고문헌

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