1: 1-ethynyl-2-(methoxymethoxy)benzene With n-butyllithium in tetrahydrofuran; hexane T=-35°C; 0.333333 h; 2: chloroformic acid ethyl ester in tetrahydrofuran; hexane 0.5 h;

1: With sodium hydroxide; water in ethanol T=20°C; 2 h; 2: With hydrogenchloride in ethanol; water pH=2;