in toluene byproducts: LiCl; NaAlH4 loaded in a vertical-type ball mill under Ar or N2; toluene added; mixt. agitated for 10 min at 70°C; mixt. of Et22AlCl with olefin (NaAlH4:Et2AlCl:olefin=1.04:1.0:4.5) added; mixt. agitated for 1.5 h at 100°C; cooled; suspn. filtered off under Ar; solvent and olefin removed (vac.);elem. anal.;