[CH3:1][N:2]([CH2:4][CH2:5][OH:6])[CH3:3].[C:7](=O)([O:10][CH:11]([CH3:13])[CH3:12])[O:8]C>CO>[C:7](=[O:8])([O:6][CH2:5][CH2:4][N:2]([CH3:3])[CH3:1])[O:10][CH:11]([CH3:13])[CH3:12]reacting 2-(N,N-dimethylamino)ethanol with the methyl isopropyl carbonate formed in step i) in the presence of a transesterification catalyst to form isopropyl 2-dimethylaminoethyl carbonate and methanol, under such conditions that the 2-(N,N-dimethylamino)ethanol also reacts with the di-isopropyl carbonate formed in step i) to form more isopropyl 2-dimethylaminoethyl carbonate,
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