- Rearrangement of arylhydrazones of aromatic and arylaliphatic carbonyl compounds to biphenyl derivatives. 3
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The behavior toward polyphosphoric acid of arylhydrazones of aromatic carbonyl compounds (anisaldehyde, substituted benzophenones, (4-methoxyphenyl)glyoxylic acid esters) and arylaliphatic ketones (4-methoxy- and 4-aminoacetophenone) is described.Biphenyl derivatives are formed through a sigmatropic rearrangement, which often occurs in competition with the expected Fischer indole synthesis and, in the case of the 4-amino-acetophenone 2,6-dimethylphenylhydrazone, with a completely new sigmatropic rearrangement.
- Fusco, R.,Sannicolo, F.
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