alpha,omega-Bis(heptamethylcyclotetrasiloxanyloxy)oligodimethylsilanes have been synthesized by heterofunctional condensation of hydroxyheptamethylcyclotetrasiloxane with alpha,omega-dichloropermethyloligosilanes, Cl(Me2Si)(n)Cl (n = 1-4, or 6). The substances are characterized by mass spectrometry, Si-29-NMR, IR and UV spectroscopy. (C) 1999 Elsevier Science S.A. All rights reserved.
Aerobic Co-/<i>N</i>-Hydroxysuccinimide-Catalyzed Oxidation of <i>p-</i>Tolylsiloxanes to <i>p-</i>Carboxyphenylsiloxanes: Synthesis of Functionalized Siloxanes as Promising Building Blocks for Siloxane-Based Materials
作者:Irina K. Goncharova、Kseniia P. Silaeva、Ashot V. Arzumanyan、Anton A. Anisimov、Sergey A. Milenin、Roman A. Novikov、Pavel N. Solyev、Yaroslav V. Tkachev、Alexander D. Volodin、Alexander A. Korlyukov、Aziz M. Muzafarov
DOI:10.1021/jacs.8b12600
日期:2019.2.6
that the suggested method is applicable for the oxidation of organic alkylarene derivatives (Ar-CH3, Ar-CH2-R) to the corresponding acids and ketones (Ar-C(O)OH and Ar-C(O)-R), as well as hydride silanes ([Si]-H) to silanols ([Si]-OH). The possibility of synthesizing monomeric (methyl) and polymeric (siloxane-containing PET analogue, Sila-PET) esters based on 1,3-bis( p-carboxyphenyl)disiloxane was
Bromine was utilized in the presence of stoichiometric amount of pyridine to brominate silanic hydrogen of methylhydropolysiloxanes. Methylbromopolysiloxanes thus obtained and methylchloropolysiloxanes prepared from photo-chlorination of methylhydropolysiloxanes were hydrolyzed with or without methylchlorosilanes to yield new methylhydroxypolysiloxanes and branched methylpoly siloxanes. Preparation
Aerobic Co or Cu/NHPI-catalyzed oxidation of hydride siloxanes: synthesis of siloxanols
作者:Ashot V. Arzumanyan、Irina K. Goncharova、Roman A. Novikov、Sergey A. Milenin、Konstantin L. Boldyrev、Pavel N. Solyev、Yaroslav V. Tkachev、Alexander D. Volodin、Alexander F. Smol'yakov、Alexander A. Korlyukov、Aziz M. Muzafarov
DOI:10.1039/c8gc00424b
日期:——
A highlyefficientpreparativemethod for the synthesis of siloxanols based on aerobic Co(OAc)2 or Cu(OAc)2/NHPI-catalyzed oxidation of hydride siloxanes using “green”, commercially available, simple inexpensive reagents and mild reaction conditions has been proposed. This is a general reaction for the synthesis of mono-, oligo- and polymeric siloxanols with various structures (linear, branched and