methyl-magnesium iodide; aluminium trichloride; trichlorophosphate in diethyl ether CH2CHGeCl3 added dropwise to adamantane and AlCl3 (stirring); heated (140°C, 2 h, stirring); cooled; hexane and POCl3 added; ether added; MeMgI added dropwise; boiled (5 h); colled; fractionated; GLC; elem.anal.;