1-Ethyl-4-ethynylbenzene undergoes homocoupling reaction in the presence of copper chloride (catalyst) and air (oxidant) to yield symmetrical 1,4-disubstituted 1,3-diyne.1-Ethyl-4-ethynylbenzene may be used to synthesize: · 2,4-bis[(4-ethylphenyl)ethynyl]-6-methoxy-1,3,5-triazine · 2-[(4-ethylphenyl)ethynyl]-4-methoxy-6-(phenylethynyl)-1,3,5-triazine · 2-chloro-4-[(4-ethylphenyl)ethynyl]-6-methoxy-1,3,5-triazine · 4-chloro-6-[(4-ethylphenyl)ethynyl]-N,N-diphenyl-1,3,5-triazin-2-amine 1-Ethyl-4-ethynylbenzene undergoes homocoupling reaction in the presence of copper chloride (catalyst) and air (oxidant) to yield symmetrical 1,4-disubstituted 1,3-diyne.