1,3-Propanediol → Tetraethoxysilane
Reaction equation
C(O)[CH2:2][CH2:3][OH:4].N(CCC[Si:12]([O:19][CH2:20][CH3:21])([O:16][CH2:17][CH3:18])[O:13][CH2:14][CH3:15])=C=O>C([O-])(=O)CCCCCCCCCCC.C([O-])(=O)CCCCCCCCCCC.C([Sn+2]CCCC)CCC>[CH3:15][CH2:14][O:13][Si:12]([O:4][CH2:3][CH3:2])([O:19][CH2:20][CH3:21])[O:16][CH2:17][CH3:18]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
1,3-Propanediol (2.9 g, 38.0 mmol) is reacted with 3-isocyanatopropyltriethoxy silane (16.4 g, 76.0 mmol) and 0.2% dibutyltin dilaurate catalyst. The reaction is conducted under nitrogen at room temperature in a glass vessel with mechanical stirring. An exotherm occurs after 15 minutes and the reaction is complete after 2 hours as evidenced by infrared spectroscopy. The following TEOS macromer is obtained ##STR9## as a low viscosity liquid, MW 508.72, which is stable at room temperature.