1: methyl 2,4-hexadienoate With allyl bromide; Hoveyda-Grubbs catalyst second generation in dichloromethane T=20°C; 48 h; 2: triethyl phosphite in toluene Michaelis-Arbuzov phosphonation; 1 h; Heating;

in toluene Michaelis-Arbuzov reaction; 1 h; RefluxInert atmosphere;

cross-metathesis reaction;