dihydrogen peroxide; Mn(CH3COO)2*4H2O; Me3-TACN; sodium L-ascorbate in water; acetonitrile T=0°C;

in ethanol; chloroform T=12 - 20°C; 1 h;

in ethanol; chloroform T=12 - 20°C; 1 h;

in ethanol; chloroform T=12 - 20°C; 1 h;

diethyl ether

1: diethoxyphosphoryl-acetic acid ethyl ester With potassium tert-butylate in ethylene glycol dimethyl ether T=0°C; Wadsworth-Emmons cyclopropanation; 0.5 h; Inert atmosphere; 2: ethyl oxirane-2-carboxylate in ethylene glycol dimethyl ether T=40°C; Wadsworth-Emmons cyclopropanation; Inert atmosphereReflux;

potassium biphenyle; water 1) THF, -80 deg C, 1 h, 2) THF, -80 deg C to RT; Yield given. Multistep reaction;