Catalyzed by PdCl2 (PPh3) 2/CuBr, E-ethyl 3-methyhridec-2-en-4- ynoate is synthesized with but-1-yne and ethyl but-2-ynoatein in PEG-400(poly(ethylene glycol-400)). The reaction is conducted under mild and environmental-friendly condition. The structure is confirm...