Cyclization reactions of 1,6-dienes and 1,6-enynes by dual cobalt photocatalysis

Two triphenylamine-derived organophotocatalysts were developed. Their photocatalytic capacity was exploited to enable the [Co III ]-H-mediated cycloisomerization of 1,6-dienes and reductive cyclization of 1,6-enynes under visible light irradiation.