Author:
Badger GM,Joshua CP,Lewis GE
Abstract
4-Benzdaminoazobenzene and
4,4'-bisbenzalaminoazobenzene have been shown to undergo photochemical
cyclodehydrogenation in concentrated (98%) sulphuric acid to give
2-aminobenzo[c]cinnoline and 2,9-diaminobenzo[c]cinnoline respectively in
excellent yields; but 4-aminoazobenzene and 4,4'-diaminoazobenzene were not
cyclized. 3-Arninoazobenzene and 3-benzalaminoazobenzene both gave
3-aminobenzo[c]cinnoline. 3-Nitro- and 3-acetyl-azobenzenes gave 3-nitro- and
3-acetyl-benzo[c]cinnolines; and 4-nitro- and 4-acetyl-azobenzenes gave
2-nitro- and 2-acetyl-benzo[c]cinnolines.
Cited by
36 articles.
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