Photocatalysis by phenothiazine dyes: visible-light-driven oxidative coupling of primary amines at ambient temperature.
New phenothiazine based organic dyes were prepared for visible-light-driven organic transformations. The 3,7-disubstituted phenothiazine derivatives showed visible light absorption and reversible one-electron oxidation behavior. In the presence of 0.5 mol % of 3,7-disubstituted phenothiazines, primary benzylamines showed oxidative coupling under visible light irradiation from a blue LED. The electronic effect of substituents in phenothiazine dyes was observed in catalytic activities. The mechanistic pathway of oxidative coupling was discussed based on the detection of H(2)O(2) after the reaction.
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
Ji Hoon
JH
Park
Kyoung Chul
KC
Ko
Eunchul
E
Kim
Nojin
N
Park
Ju Hong
JH
Ko
Do Hyun
DH
Ryu
Tae Kyu
TK
Ahn
Jin Yong
JY
Lee
Seung Uk
SU
Son