Photochemisches Verhalten von 3,4-Diarylsydonen. Vorläufige Mitteilung |
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Authors: | M. M rky,H.-J. Hansen,H. Schmid |
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Affiliation: | M. Märky,H.-J. Hansen,H. Schmid |
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Abstract: | 3, 4-Diphenyl-sydnone ( 1a ) and 3-p-tolyl-4-phenyl-sydnone ( 1b ) on irradiation with a mercury high-pressure lamp in pyrex vessels yield 2,4,5-triphenyl- ( 3a ) and 2-p-tolyl-4,5-diphenyl-1,2,3-triazole ( 3b ), respectively. Irradiation of 1a and 1b in the presence of dimethyl acetylene-dicarboxylate or indene leads to the formation of the pyrazoles 4a and 4b and the Δ2-pyrazolines 5a and 5b , respectively. Reactive intermediates of the photoreaction of 1a and 1b seem to be the diazirines 2a and 2b , which open to give the 1,3-dipolar structures 8a and 8b . |
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