Methyltrimethoxysilane → Methyltrimethoxysilane Isobutyltrimethoxysilane KOH

HRID 1852305

Reaktionsgleichung

Reaktionsgleichung von HRID 1852305
[CH2:1]([Si:5]([O:10][CH3:11])([O:8][CH3:9])[O:6][CH3:7])[CH:2]([CH3:4])[CH3:3].C[Si](OC)(OC)[O:14]C.[OH-].[K+:21]>O>[CH3:1][Si:5]([O:10][CH3:11])([O:8][CH3:9])[O:6][CH3:7].[CH2:1]([Si:5]([O:10][CH3:11])([O:6][CH3:7])[O:8][CH3:9])[CH:2]([CH3:4])[CH3:3].[OH-:14].[K+:21]

Komponenten

5

Edukt 3

HCID 14456MethyltrimethoxysilaneHCID 14797Potassium HydroxideHCID 87622Isobutyltrimethoxysilane2×

Produkt 1

HCID 86712056Methyltrimethoxysilane Isobutyltrimethoxysilane KOH

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel4×

Versuchsvorschrift

A 500 ml 5-neck round-bottom flask rendered inert with nitrogen and equipped with paddle stirrer, dropping funnel, thermometer, and water separator with reflux condenser is charged—in an oil bath at 40° C.—with 28 g (0.157 mol) of isobutyltrimethoxysilane (=2-methyl-1-propyltrimethoxysilane, available commercially from abcr GmbH & Co. KG), 21.8 g (0.157 mol) of methyltrimethoxysilane (available commercially from Wacker Chemie AG), and 66 g of Isopar E (isoparaffinic hydrocarbon mixture with a boiling range of 113-143° C., available commercially from ExxonMobil). The water separator is filled to the brim with Isopar E. While stirring at 350 rpm, a solution of 20.7 g (0.314 mol) of potassium hydroxide (85% strength, available commercially from AppliChem) in 16.7 g of demineralized water is metered in over 10 minutes. During this addition, the reaction mixture warms up to 48° C. By subsequent heating it is bought to boiling temperature. The distillate separates out as the lower phase in the water separator. Up to a boiling temperature of 118° C., 34.3 g of clear colorless distillate are collected, which according to analysis by gas chromatography contains 87.4% methanol, 8.6% water, and 3% Isopar E. The hydrolysis of the methoxy radicals, accordingly, is quantitative. During the distillation, a pasty white solid separates out in the reaction mixture. The volatile constituents are removed by distillation at 70° C./4 hPa. The residue left is a white, coarse powder whose solids content is 97.5% (determined using the HR73 Halogen Moisture Analyzer solids content balance from Mettler Toledo at 160° C.).

Aufarbeitung

  1. customA 500 ml 5-neck round-bottom flask rendered inert with nitrogen
  2. customequipped with paddle stirrer
  3. temperaturewith reflux condenser
  4. customis charged—in an oil bath at 40° C.
  5. customis metered in over 10 minutes
  6. additionDuring this addition
  7. customwarms up to 48° C
  8. temperatureBy subsequent heating it
  9. distillationUp to a boiling temperature of 118° C., 34.3 g of clear colorless distillate are collected
  10. customThe hydrolysis of the methoxy radicals
  11. distillationDuring the distillation
  12. customThe volatile constituents are removed by distillation at 70° C./4 hPa
  13. waitThe residue left
  14. customat 160° C.

Quellen und Nachweise

ORD-Eintrag
ord-40c2bbb4bdf145b98bd00f878ff8a41a
Quelldatensatz
uspto-grants-2015_02
Patentnummer
US08961672B2

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