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New benzoxazine and benzothiazine cyanine dyes

✍ Scribed by Francesco Chioccara; Giuseppe Prota; Ronald H. Thomson

Book ID
104213532
Publisher
Elsevier Science
Year
1975
Tongue
French
Weight
154 KB
Volume
16
Category
Article
ISSN
0040-4039

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✦ Synopsis

Whereas various substituted 1,4-benzoxasines have been described,2 the parent compound, which theoretically may exist either in the enamine (la) or the cyclic imine (lb) form, is still unknown.

In an attempt to obtain (1) by an unambiguous and simple route, sodium g-nitro-

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New benzoxazine and benzothiazine dyes
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Synthesis of new acidochromic-based dyes is presented. The dyes obtained have acid absorbance maxima at 640-700 nm and expose spectral changes in the pH-range from 8 to 12.