Derivatives of 14H-naphtho[2,3-a]phenothiazine-8,13-dione. Part 2: Syntheses from 1,4-dihydroxy-5-(6-,7-,8-)substituted anthraquinones-Science-Chemical Encyclopedia-lookchem

Derivatives of 14H-naphtho[2,3-a]phenothiazine-8,13-dione. Part 2: Syntheses from 1,4-dihydroxy-5-(6-,7-,8-)substituted anthraquinones
Add time:08/09/2019 Source:sciencedirect.com

The synthesis of some 7-hydroxy-14H-naphtho[2,3-a]phenothiazine-8,13-diones containing electron donor and acceptor substituents in the unhydroxylated anthraquinone ring affords colorants of near-infrared absorbing potential. The relative influence of electron donor and acceptor substituents on the absorption maxima of the dyes is reviewed.

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