Silanol-Based Surfactants: Synthetic Access and Properties of an Innovative Class of Environmentally Benign Detergents
作者:Natascha Hurkes、Heike M. A. Ehmann、Martina List、Stefan Spirk、Malte Bussiek、Ferdinand Belaj、Rudolf Pietschnig
DOI:10.1002/chem.201402857
日期:2014.7.21
Herein, environmentally friendly surfactants based on new silanols as substitutes for the isoelectronic phosphonates were explored. Surface tensions of aqueous solutions are significantly reduced, particularly with those silanols that feature a high ratio of organic moiety to silanol. Besides their use as surfactants, their potential as coating agents for hydrophilic oxide surfaces was investigated
Controlled condensation reactions of tertiary silanetriols CH3(CH2)n(CH3)2CSi(OH)3 (1b–f; n = 1–5) in the presence of trifluoroacetic acid and the hydrolysis of CH3(CH2)6(CH3)2CSiCl3 (3) lead to the selective formation of the corresponding disiloxane tetrols [CH3(CH2)n(CH3)2CSi(OH)2]2O (2b–g; n = 1–6) in good yields. The TBAF-driven condensation reactions of the silanetriols CH3(CH2)n(CH3)2CSi(OH)3 (1a–c;