Issue 19, 1977
From the journal:

Journal of the Chemical Society, Perkin Transactions 1

Photocyclisation and photoisomerisation of 1,3,4- and 1,4,5-triphenylpyrazole

James Grimshaw  and  David Mannus  

Abstract

Irradiation of 1,4,5-triphenylpyrazole in the presence of iodine gives 1-phenyl-1H-phenanthro[9,10-c]pyrazole, identical with a specimen prepared by an independent route. 1,3,4-Triphenylpyrazole does not react under these conditions; this is thought to be because the intermediate non-aromatic polyene would be dipolar. Irradiation of 1,4,5-triphenylpyrazole in the presence of benzophenone gives 3-anilino-2,3-diphenylacrylonitrile, which is itself inert towards irradiation. 3-Aminoacrylonitriles are postulated as intermediates in some rearrangements of pyrazoles to imidazoles.

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Article information

DOI
https://doi.org/10.1039/P19770002096
Article type
Paper

J. Chem. Soc., Perkin Trans. 1, 1977, 2096-2099

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Photocyclisation and photoisomerisation of 1,3,4- and 1,4,5-triphenylpyrazole

J. Grimshaw and D. Mannus, J. Chem. Soc., Perkin Trans. 1, 1977, 2096 DOI: 10.1039/P19770002096

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