[CH2:1]([PH:3][CH2:4][CH3:5])[CH3:2].[Li]CCCC.Cl[CH2:12][CH2:13][N:14]([CH2:19][CH2:20]Cl)[Si](C)(C)C.[Li][P:23]([CH2:26][CH3:27])[CH2:24][CH3:25]>C1COCC1.O>[CH2:1]([P:3]([CH2:4][CH3:5])[CH2:12][CH2:13][NH:14][CH2:19][CH2:20][P:23]([CH2:26][CH3:27])[CH2:24][CH3:25])[CH3:2]To a stirred solution of diethylphosphine (6.72 g, 74,6 mmol) in THF (150 ml) at −35° C., was added 47 ml of n-BuLi (1.6 M). Next, bis(2-chloroethyl)trimethylsilylamine (8.18 g, 38.4 mmol) in 40 ml tetrahydrofuran was then added dropwise to the LiP(Et)2 in tetrahydrofuran at −50° C. The mixture was allowed to warm to room temperature and stirred for 30 minutes. It was then heated to 60° C. and stirred overnight after which 100 ml of water was added to hydrolyse the silyl groups and the reaction mixture heated to 60° C. for 1 hour to ensure complete removal of the silyl groups. The reaction mixture was dried by passing it through a small bed of MgSO4, which was subsequently washed through with 60 ml diethyl ether. The solvent was removed to give 6.96 g bis(2-diethylphosphino-ethyl)-amine (Yield: 73%). 1H-NMR (C6D6) δ 1.12 (12H, d of t, CH2CH3, J=7.2 and 14.1 Hz), 1.38 (8H, q, CH2CH3, J=7.2), 1.60 (4H, t, (CH2)P, J=7.2) and 2.84 (4H, q, (CH2)N, J=7.8). 31P-NMR (C6D6) δ −26.02.
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