1: With boron trifluoride diethyl etherate; 1,1,1,2,2,2-hexabutyl-distannane in benzene T=20°C; 6 h; UV-irradiation; 2: With sodium hydrogencarbonate in acetone T=20°C; 24 h; Further stages.;

1: With triethylamine in dichloromethane T=20°C; 6 h; 2: With sodium iodide in acetone T=20°C; 5 h; Further stages.;

1,1,1,2,2,2-hexabutyl-distannane in benzene T=80°C; 3 h; UV-irradiation;