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Visible Light Photocatalytic Synthesis of Benzothiophenes

Hari, Durga Prasad ; Hering, Thea ; König, Burkhard


The photocatalytic reaction of o-methylthio-arenediazonium salts with alkynes yields substituted benzothiophenes regioselectively through a radical annulation process. Green light irradiation of eosin Y initiates the photoredox catalysis. The scope of the reaction was investigated by using various substituted diazonium salts and different alkynes.

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