in further solvent(s) (N2); mixt. of dicyano alkoxy benzene and anhydrous CuCl2 in 2-(dimethylamino)ethanol was refluxed for 78 h, then diluted with CHCl3 and poured into acetone.; ppt. filtered, extd. with acetone (24 h), methanol (48 h), ether (24 h); recrystn. from hexane; further purifn. by chromy. (SiO2; CHCl3) under slightly elevated pressure; purity checked by TLC (SiO2; CHCl3/acetone 10:1 vol);