[O-2].[Na+].[Na+].C[Si](C)(C)[N:6]1[CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][C:7]1=[O:13].[Na].C1(=O)NCCCCC1.[CH2:25](Br)[CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH2:33][CH2:34][CH2:35][CH3:36]>COCCOC>[CH2:36]([N:6]1[CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][C:7]1=[O:13])[CH2:35][CH2:34][CH2:33][CH2:32][CH2:31][CH2:30][CH2:29][CH2:28][CH2:27][CH2:26][CH3:25]
3.1 g (0.05 mol) of sodium oxide (Na2O) are suspended in 150 ml of 1,2-dimethoxyethane, and then 18.5 g (0.1 mol) of N-trimethylsilylcaprolactam are added. The reaction mixture is stirred at 50° C. for two hours, during which the voluminous precipitate of the sodium salt of the caprolactam forms. Then 24.9 g (0.1 mol) of n-dodecyl bromide are added, and the mixture is stirred and heated under reflux for 20 hours. The working-up is carried out as indicated in Example 1.
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