1: With tetrachlorosilane; N-ethyl-N,N-diisopropylamine in dichloromethane T=-72°C; 1 h; 2: With oxygen; ozone in dichloromethane T=-78°C; 0.333333 h; 3: With lithium aluminium tetrahydride in tetrahydrofuran; dichloromethane T=65°C; 1.5 h; Further stages. Title compound not separated from byproducts.;

1: With tetrachlorosilane; N-ethyl-N,N-diisopropylamine in dichloromethane T=-72°C; 1 h; 2: With oxygen; ozone in dichloromethane T=-78°C; 0.333333 h; 3: With lithium aluminium tetrahydride in tetrahydrofuran; dichloromethane T=65°C; 1.5 h; Further stages. Title compound not separated from byproducts.;