Unsymmetrical 1,3-diynes can easily be accessed under catalyst-free conditions by reacting terminal alkynes with hypervalent iodine-based electrophilic alkyne-transfer reagents.
A new transition-metal-free PhI(OAc)2-promoted highly selective hydroboration of terminal alkynes with bis(pinacolato)diboron has been developed at room temperature under air.
Carboxylating terminal alkynes with CO2 to produce propiolic acids is an atom-economic and high-value route for CO2 fixation and utilization, but the conversion under mild conditions needs transition metal catalysts....
Transition metal-free coupling of terminal alkynes and hypervalent iodine-based alkyne-transfer reagents to access unsymmetrical 1,3-diynes
