in pentane to suspn. 1,2-Mo2Br2(CH2SiMe3)4 in pentane was added NHMe2 (10 equiv.) and stirred for 2 h; H2NMe2Br was filtered off, solvent was stripped;

in pentane to suspn. 1,2-Mo2Br2(CH2SiMe3)4 in pentane at 0°C was added NHMe2 (10 equiv.) and stirred for 15 min with the last 5 min at room temp.; H2NMe2Br was filtered off, solvent was stripped;