1: diethoxyphosphoryl-acetic acid ethyl ester With sodium hydride in 1,2-dimethoxythane; mineral oil
T=0 - 20°C;
2: 1,3-dihydro-1-oxo-2H-indene in 1,2-dimethoxythane; mineral oil
T=0 - 20°C; Reflux;
3: With water in 1,2-dimethoxythane; mineral oil
T=20°C;