NH(CH2CH3)2 in diethyl ether; cyclohexane (under N2); addn. of the Grignard compd. in ether to a soln. of the borane in cyclohexane with stirring, temp. is raised to the boiling point, mixture is heated under reflux; after cooling addn. of Et2HN, stirring, filtn., distn., mixture of the products is obtained, overall yield 56 percent, ratio alkyl:dialkyl compd. 82:18, detected by NMR;

in tetrahydrofuran; cyclohexane Ar-atmosphere; stirring (room temp., overnight); filtering, concg. (vac.), distg. (vac.); elem. anal.;

(C2H5)3N

in hexane excess of C2H2;

potassium hexamethyldisilazane in tetrahydrofuran byproducts: KCl; under Ar atm. to soln. KHDMS in THF ketone in THF was added dropwise at 0°C for 30 min, soln. chlorobis(dialkylamino)borane in THF was added and stirred at room temp. for 1 h; soln. was cenrifugated, ppt. was filtered, volatiles were removed in vacuo;

diethylamine; phenyl-magnesium bromide in diethyl ether; cyclohexane (under N2); addn. of the Grignard compd. in ether to a soln. of the borane in cyclohexane with stirring, temp. is raised to the boiling point, mixture is heated under reflux; after cooling addn. of Et2HN, stirring, filtn., distn., mixture of the products is obtained, overall yield 95 percent, ratio alkyl:dialkyl compd.:HB(NEt2)2 79:12:9, detected by NMR;

NH(CH2CH3)2 in hexane; cyclohexane (under N2); dropwise addn. of the lithium compd. in hexane to a soln. of the borane in cyclohexane at 0°C with stirring, stirring at 20°C; addn. od diethylamine, stirring, filtd., distd., overall yield 86 percent, ratio alkyl:dialkyl:HB(NEt2)2 85:14:1, detected by NMR;

B(N(C2H5)2)2Sn(CH3)3 dropped to Sn(CH3)3Li at 0°C for 2 h, stirred for 4 h; evapd., dissolved in Et2O, filtered, distd., elem.anal.;

n-butyllithium

in hexane excess of C2H2;