Synthesis and crystal structure of disiloxane-1,3-diols and disiloxane-1,1,3,3-tetraol
摘要:
1,3-Dimethyl- or 1,3-divinyl-1,3-di-t-butoxydisiloxane-1,3-diol and 1,3-diphenyldisiloxane-1,1,3,3-tetraol were synthesized by hydrolysis of the corresponding diisocyanatodisiloxanes and tetrachlorodisiloxane. The disiloxanediols were soluble in common organic solvents and thermally very stable, therefore, they could be sublimed without decomposition. X-ray crystallography showed that the disiloxane-1,3-diols in the crystal feature a 1.21 nm diameter columnar array with intermolecular hydrogen bonding. The disiloxane1,1,3,3,-tetraol, on the other hand, revealed molecules with a gauche- and anti-conformation depending on crystallization method which formed a columnar array and a sheet-like array, respectively. It was confirmed that these silanols can be potential building blocks for ladder oligosilsesquioxanes. (c) 2007 Elsevier B.V. All rights reserved.
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