in diethyl ether reaction for 12 h at room temperature;;

in tetrahydrofuran byproducts: LiCl, (CH3)2CCH2; reaction at 60°C for 7 h;;

hydrogenchloride in ethylene glycol dimethyl ether heating mixt. of Pr- and Sn-compds. and DME (molar ratio of Pr/Sn=2:1, evac. sealed vessel) for 10 h at 100°C, DME replacing by hexane in usual way; ppt. washing (hexane), vac.-drying; elem. anal., GLC;

in ethylene glycol dimethyl ether (vac.) to soln. of Pr compd. was added tin compd. and mixt. was heated at 100°C for 15 h; solvent was removed in vac., residue washed with hexane and dried in vac.; elem. anal.; (Me3Si)2NH was detected by GLC anal. of volatiles;

in ethylene glycol dimethyl ether (vac.) to soln. of Nd compd. was added tin compd. and mixt. was heated at 100°C for 15 h; solvent was removed in vac., residue washed with hexane and dried in vac.; elem. anal.; (Me3Si)2NH was detected by GLC anal. of volatiles;