Phenol-naphthol-benzeine - Synthesis and chromophoric properties. Part 5: Benzeines
Phenols 4 and 1-naphthol (5) react with benzotrichloride (6) to give benzaurines 7, phenol-naphthol-benzeines 3 and α-naphtholbenzein (1), which were isolated by chromatography. Phenol-naphthol-benzeines 3 are X-/Y-chromophores like α-naphtholbenzeine (1) with two absorption maxima. These are hypsochromically shifted in neutral, in alkaline and in acidic solution, compared with those of 1.
Kallmayer,Lenze
p. 534 - 536
(2007/10/03)
The colour of benzaurine and of its alkylsubstituted derivates. Part 6: Benzeines
The colour of oxonoles 5a, 6 and 7 in neutral, in alkaline and in acidic solution correlates with the π-system extension. A correlation with the symmetry of the mesomeric charge distribution is not given. The colour of benzaurines 3, 4 and 5b-j depends on the position of the alkyl substituents.
Kallmayer,Lenze
p. 827 - 831
(2007/10/03)
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