hydrogenchloride; sodium methylate in methanol

1: malonic acid dimethyl ester With sodium methylate in methanol T=25°C; 0.5 h; 2: 3-methoxy-2-pentylcyclopent-2-en-1-one in methanol 24 h; Heating / reflux; 3: With hydrogenchloride in methanol; water T=0°C; pH=7;