1: in ethanol T=75°C; 36 h; 2: With sodium hydrogencarbonate in water T=20°C; 0.333333 h;

1: (2-oxo-5-methyltetrahydrofuran-3-yl)-phosphonic acid diethyl ester With potassium carbonate in tetrahydrofuran; water T=20°C; 1 h; 2: cyclohexanecarbaldehyde in tetrahydrofuran; water T=70°C; 15 h;