Synthesis and characterization of polysilabutane having oligo(oxyethylene)phenyl groups on the silicon atom

摘要

A new class of polar polysilabutanes with mono- or tri-(oxyethylene) phenyl groups on the silicon atom have been synthesized by anionic polymerization of silacyclobutanes having omega-(t-butyldimethylsilyl-protected) mono-or tri-(oxyethylene)phenyl groups and subsequent deprotection of the silyl groups. The monomers were synthesized by treatment of I,1-dichlorosilacyclobutane with omega-(t-butyldimethylsilyl-protected) mono-or tri-(oxyethylene) phenyl Grignard reagents. Anionic polymerization of silacyclobutane was performed with butyllithium initiator in THF. t-Butyldimethylsilyl-protecting groups at polymer pendant groups were hydrolyzed with tetrabutyl ammonium fluoride in water-containing THF. The obtained polysilabutanes were soluble in a polar organic solvent such as methanol, and their mass distributions were analysed by matrix-assisted laser-desorption-ionization mass spectrometry (MALDI TOF MS). (C) 1998 John Wiley & Sons, Inc. [References: 23]