1: With ozone in dichloromethane T=-78°C; 0.25 h; 2: With sodium tetrahydroborate in dichloromethane T=20°C; Inert atmosphere;

sodium perchlorate; bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride in tetrahydrofuran; dichloromethane T=45°C; 1 h; other salts or in the absence of salt as template; Product distribution;