It has been established that the dienylation of unfunctionalized arenes with 1,6-diynes,
possessing aryl groups at the diyne termini, proceeds to give the corresponding dienylated
arenes in the presence of a catalytic amount of an electron-deficient cyclopentadienyl
rhodium(III) complex, [CpERhCl2]2, and a stoichiometric amount of silver carbonate. Experimental and theoretical mechanistic
studies revealed that a CpERh(I) complex generated in situ might catalyze the present dienylation reaction.
Key words
alkynes - dienylation - directing group-free C–H bond activation - rhodium - unfunctionalized
arenes