Fig. 1: Construction of configuration-defined alkenes and our design plan.

a Triplet energy transfer-induced alkene isomerization. b Transition metal-catalyzed Z-selective hydroalkylation of alkynes. c Our design plan for a bifunctional iron-catalyzed system. d Graphical abstract for this work of bifunctional iron-catalyzed alkyne Z-selective hydroalkylation and Z-E inversion. PS photosensitizer, LG leaving group, SET single electron transfer, L ligand, C alkyl.