1: 4-hydroxy-3-(2-propenyloxy)benzaldehyde With sodium hydride in N,N-dimethyl-formamide T=20°C; 0.0833333 h; 2: methyl iodide in N,N-dimethyl-formamide T=20°C; 3.5 h; Further stages.;

sodium hydroxide; sodium tetrahydroborate T=20°C;