[OH:1][CH2:2][CH2:3][N:4]1[CH2:9][C:8]([CH3:11])([CH3:10])[NH:7][C:6]([CH3:13])([CH3:12])[C:5]1=[O:14].[CH2:15]1[O:17][CH2:16]1>CO.Cl>[OH:1][CH2:2][CH2:3][N:4]1[CH2:9][C:8]([CH3:10])([CH3:11])[N:7]([CH2:15][CH2:16][OH:17])[C:6]([CH3:13])([CH3:12])[C:5]1=[O:14]45.3 g (0.22 moles) of 1-(2-hydroxyethy)-3,3,5,5-tetramethyl-piperazin-2-one are dissolved in 450 ml of methanol in the presence of 2 ml of HCl 37% (% wiw). The solution is poured into an autoclave and 19.4 g (0.44 moles) of ethylene oxide are added. The solution is heated to 130° C. and maintained at 130° C. for 60 hours under stirring.
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