Br[CH2:2][CH2:3][CH2:4][Sn:5]([CH2:12][CH2:13][CH3:14])([CH2:9][CH2:10][CH3:11])[CH2:6][CH2:7][CH3:8].[CH3:15][N:16]([CH3:21])[CH2:17][CH2:18][CH2:19][NH2:20].C(=O)(O)[O-].[Na+]>C(OCC)C>[Sn:5]([CH2:4][CH2:3][CH2:2][NH:20][CH2:19][CH2:18][CH2:17][N:16]([CH3:21])[CH3:15])([CH2:12][CH2:13][CH3:14])([CH2:9][CH2:10][CH3:11])[CH2:6][CH2:7][CH3:8]Over a period of 0.5 hour 9.25 g (0.025 mol) of (3-bromopropyl) tripropyltin was added to 25 ml of 3-dimethylaminopropyl amine at room temperature. The mixture was stirred for 1 hour at 60° C. Under cooling 75 ml of diethylether and 60 ml of a 15% aqueous solution of sodium bicarbonate were added. After stirring for 0.5 hour the organic phase was separated, dried and evaporated in vacuo. Distillation gave 7.5 g (77%) of Pr3Sn(CH2)3NH(CH2)3NMe2 ; b.p. 113°-114° C./0.1 mm Hg, nD20 =1.4855.
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