aluminium trichloride in neat (no solvent) byproducts: NaCl; under N2 or Ar; mixt. of (AlH3)(n), Na(i-Bu)2AlH2 and olefin (molar ratio 1:0.20:5) heated in ball mill to 100°C; stored at 90-100°C for 1.5 h; balls sepd.; filtered; excess olefin removed in vac.; AlCl3 added; heated with stirring at 80-90°C for 1.5 h; filtered; elem. anal.;