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Reactivity of the Sterically Demanding Siloxanediol Mes 2 Si(OH)(μ‐O)Si(OH)Mes 2 Towards Water and Ether Molecules
Author(s) -
Roesch Philipp,
Warzok Ulrike,
Enke Martin,
Müller Robert,
Schattenberg Caspar,
Schalley Christoph A.,
Kaupp Martin,
Braun Thomas,
Wittwer Philipp
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702393
Subject(s) - chemistry , reactivity (psychology) , adduct , molecule , steric effects , conformational isomerism , hydrogen bond , intramolecular force , medicinal chemistry , ether , disiloxane , proton nmr , tetramethylammonium , stereochemistry , crystallography , catalysis , organic chemistry , medicine , ion , alternative medicine , pathology
A series of isotopologues of the siloxanediol Mes 2 Si(OH)(μ‐O)Si(OH)Mes 2 ( 3 a ) (Mes=2,4,6‐trimethylphenyl) were synthesized by reactions of the corresponding disiloxane precursors Mes 2 Si(μ‐O) 2 SiMes 2 ( 2 a ), Mes 2 Si(μ‐ 17 O) 2 SiMes 2 ( 2 b ) or Mes 2 Si(μ‐ 18 O) 2 SiMes 2 ( 2 c ) with an excess of H 2 O, H 2 17 O or H 2 18 O. NMR and IR signal assignments for the siloxanediols in benzene are supported by quantum‐chemical calculations, which indicate small energy differences between trans and cis conformers, the latter of which exhibits an intramolecular hydrogen bond. 1 H NMR as well as IR data suggest the presence of a mixture of both conformers in C 6 D 6 . Hydrogen‐bonded adducts of Mes 2 Si(OH)(μ‐O)Si(OH)Mes 2 with ethers such as diethylether, dimethoxyethane or dioxane were observed in the solid state, where they form polymeric chain‐like structures. The latter appear to be stable only in the crystal. 17 O{ 1 H} NMR and IR data in THF solution suggest an interaction of 3 a with at least one THF molecule, whereas diethylether appears not to interact. Water adducts form neither in solution nor in the solid state as indicated by NMR and ATR IR data. 17 O{ 1 H} NMR and ESI‐MS experiments illustrate the remarkably high stability of the siloxanediols towards water and show no evidence for intra‐ or intermolecular oxygen‐exchange reactions. In marked contrast, a stepwise exchange of all three oxygen atoms‐including the one in the Si‐O‐Si bridge‐occurred in the gas phase, when [Mes 2 Si( 18 OH)(μ‐ 18 O)Si( 18 O)Mes 2 ] − was treated with H 2 O in the hexapole of an ESI FT‐ICR mass spectrometer. The scrambling between the bridging and the other oxygen atoms likely proceeds through cyclic Si 2 O 2 intermediates.