in benzene-d6 under N2 or Ar; in NMR tube; C6D6 added to solid mixt. of Me2NHBH3 and Mg compd. (molar ratio 1:1); sealed; heated at 60°C for ca. 2 h; not isolated; monitored by (11)B NMR spectra;

in benzene-d6 sealed tube;