1: tri-n-butyl-tin hydride With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=0°C; 1 h; 2: cyclopentanone in tetrahydrofuran; hexane T=-78°C; 1 h; 3: With methanesulfonyl chloride; triethylamine in tetrahydrofuran; hexane T=-78 - 23°C; 1 h;

in gas byproducts: hexabutylditin; placing starting material in a porcelain cup in the sublimation chamber of a flash vac. thermolysis apparatus, react. at 800-850°C in the main oven and 250-300°C in the sublimation oven (10E-2 mm), oven packed with broken porcelain; vapors quenched on a dewar cold finger, pyrolysis tube cooled to room temp., product washed with ether from the dewar surface, ether evapd., chromy. (florisil);

bis-triphenylphosphine-palladium(II) chloride in tetrahydrofuran T=50°C; 16 h;

bis-triphenylphosphine-palladium(II) chloride in tetrahydrofuran T=50°C; 16 h;