Tetrahedron p. 4699 - 4708 (1994)
Update date:2022-08-03
Topics: Photoinduced Experimental Chemical Ring transformation
Batori, Sandor
Doepp, Dietrich
Messmer, Andras
The photolytic behavior of the zwitterionic pyrido[1,2-b]pyridazinium-4- olate (1) was studied. A marked difference was observed depending on the wavelength used: irradiation with a light of λ>280 nm resulted in 3-phenyl- 5-(2-pyridyl)isoxazole (2) and 2-phenyl-3-(2-pyridylcarbonyl)azirine (3) as main products, while the use of light of λ<280 afforded 2-phenyl-5-(2- pyridyl)-oxazole (5) and 1-amino-1-phenyl-3-(2-pyridyl)prop-1-en-3-one (6) as main products. A mechanistic suggestion is provided.
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