Fig. 1: Cobalt-catalyzed reductive coupling of alkenes and alkynes.
From: Photoredox cobalt-catalyzed asymmetric desymmetric reductive coupling of cyclobutenes with alkynes

a Cobalt-catalyzed reductive coupling of alkynes and alkenes. b Asymmetric cobalt-catalyzed reductive coupling of alkynes and alkenes. c photoredox cobalt-catalyzed asymmetric desymmetric reductive coupling of alkynes with electronically unbiased unactivated cyclobutenes (this work).