Fig. 1: Scheme of enynes and reaction pathway.
a The enyne family features elements with different electron-rich C-C bonding configurations. The marked enetriyne species is the main product obtained by the on-surface synthesis strategy developed in this work. b Schematic illustration showing the chemical transformations in this work. They undergo in stages pristine precursor 4’-ethynyl-[1,1’-biphenyl]−4-ol (EHBP) 1, self-assembly structure 2, organometallic dimer 3, and covalent bonded enetriyne tetramer 4, respectively. The devised multistep protocol involves a precursor with a directing group, gas-mediated pretreatment, and thermally activated reactions.
