Article ID Journal Published Year Pages File Type
176874 Dyes and Pigments 2013 4 Pages PDF
Abstract

N, N, N, N-tetraethyl-9H-xanthene-3,6-diamine (9H-xanthene) was prepared by one-pot reaction of 3-diethylaminophenol with (CH3O)3CH using pyridinium para-toluenesulfonate (PPTS) as catalyst. It was found that 9H-xanthene is photo-active and could be efficiently photo-converted to pyronine B. Treatment of 9H-xanthene with acid (HCl) produced protonated 9H-xanthene (9H-xanthene·HCl), and 9H-xanthene·HCl was spontaneously converted to pyronine B in aqueous solution. Besides, both distinct color change and turn on fluorescence were observed during the conversion. These findings not only provide a new and simple approach to the preparation of 9H-xanthene and pyronine B but also benefit the applications such as indicator and probe.

► One-pot synthesis of N, N, N, N-tetraethyl-9H-xanthene-3,6-diamine (9H-xanthene) is developed. ► 9H-xanthene is photo-active and photo-converted to pyronine B in 80% isolated yield. ► Both distinct color change and turn on fluorescence are observed during the photo-conversion.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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