Silanole. XII. IR‐spektroskopische Untersuchungen an substituierten Triphenyl‐silanolen

Abstract

Es wurden die Bandenlage, die absolute Intensität und die Halbwertsbreite der OH‐Valenzschwingung von substituierten Triphenyl‐silanolen (XC6H4)3SiOH sowie die Verschiebung der OH‐Bande bei Zugabe eines Donors gemessen. Die Ergebnisse sind gut korrelierbar mit der potentiometrisch bestimmten relativen Acidität der Silanole und mit den σ°‐Konstanten der Substituenten X.

Recent Developments in the Synthesis and Structure of Organosilanols

“…At 1200°C a final, nearly carbon-free, ceramic with a composition of Mo 0.5 -Si 3 O 6.5 is formed via the loss of MoO 3 . On the other hand, pyrolysis of 271 at 1200°C affords a crystalline ceramic with composition W 2.2 Si 4 O 13 . This has been shown by XRD analysis to contain crystalline W and WO 2 .…”

Acid-catalyzed condensation of model hydroxyl-terminated dimethylsiloxane oligomers - cyclization vs. linear condensation: intra-inter catalysis

“…The data presented in Figure 8 and Table II permit a comparison of the kinetics of ring formation and linear growth in methylene chloride. The mechanisms of these processes on the level of end-group reaction should be the same since the end groups in substrate 1 are separated by a chain long enough to react Table III Effect of Dilution on the Yield of Cyclic Oligomers in the Poly condensation of H0[Si(Me)20]5H (1) in Methylene Chloride Catalyzed with Methanesulfonic Acid at 35 °C for a 65% Monomer Conversion [CH3SO3H]0 = 5.0 x 10~4 yield of cyclics, mol/(mol converted 1) [HO(SiMe2O)6H]0, (SiMe2Q)5…”

“…Constant KA of OH Homocomplexes of Me3SiOSi(Me)2OH (3) Calculated from Eq VII and KA' Calculated from Eq VI on the Assumption That No Polymer Complexes Exist in the System CC14 at35 …”

Silanole. XIV. IR‐spektroskopische Untersuchungen an Halogenmethyl‐, Benzyl‐ und α‐Halogenbenzyl‐dimethylsilanolen

“…These correlations are compared with results of analog investigations on triarylsilanols [2]. From band shapes result informations on weak intramolecular H-bonding between OH group and halogeno resp.…”

“…Wie [2] ebenfalls bestimmten AV-Werte der Triarylsilanole ergibt sich f olgende Korrelation rnit der Summe der 8-Konstanten der substituierten Aryl-Gruppen : A; = 37,6 CT; + 242 r = 0,99.…”