To further examine the outcomes of visible light-induced oxidative coupling strategy, the photocatalyst was switched to eosin Y confining 1 and 1a as the representative substrates.
The current studies revealed that with the eosin Y, the reaction proceeded efficiently and provided the desired coupling products in significant yield; further a new C-S bond formation method using eosin Y has also been established.
Yadav, Eosin Y Catalyzed Visible Light Driven Aerobic Oxidative Cyclization of Thioamides to 1,2,4-Thiadiazoles, Syn.
A 20 solution sample of eosin Y was made by a 1000-fold dilution of 20 mM eosin Y.
[sup.1]H-NMR spectra were obtained for caffeine, eosin Y, and their mixture.
Xanthene dyes, such as eosin Y, exhibit different tautomeric structures with different protolytic forms, either proton "on" or "off" depending on pH as illustrated in Figure 2 .