n-butyllithium; 2-(dimethylamino)-ethanol in tetrahydrofuran; hexane under Ar atm. soln. n-BuLi in hexane was added to soln. 2-dimethylaminoerhanol in THF at -5°C, stirred at 0°C for 30 min, 4-dimethylaminopyridine was added, stirred at 0°C for 1 h, cooled to -78°C,soln. Bu3SnCl in THF was added; after warming to room temp. soln. was concd., residue was distilled at 0.15 mm and 170-180°C, chromy. on alumina (petroleum ether);

bis-triphenylphosphine-palladium(II) chloride; triphenylphosphine in xylene Stille cross-coupling reaction; 12 h; Heating;