1: 4'-methoxyphenyl diethylphosphonoacetate With sodium hydride in tetrahydrofuran; mineral oil T=0°C; Horner-Wadsworth-Emmons olefination; 2: 4-methoxy-benzaldehyde in tetrahydrofuran; mineral oil T=20°C; Horner-Wadsworth-Emmons olefination; 1 h;

pyridine 2 h; Heating;

T=320°C; 1.5 h; pyrolysis in a sealed tube; Mechanism;

T=320°C; 1.5 h; pyrolysis in a sealed tube;