Methyltrimethoxysilane

Structural formula
General
Surname	Methyltrimethoxysilane
other names	Trimethoxymethylsilane
Molecular formula	C 4 H 12 O 3 Si
Brief description	colorless liquid with a fruity odor
External identifiers / databases
CAS number 1185-55-3 EC number 214-685-0 ECHA InfoCard 100.013.350 PubChem 14456 Wikidata Q21099559
properties
Molar mass	136.22 g mol −1
Physical state	liquid
density	0.96 g cm −3
Melting point	<-77 ° C
boiling point	102-103 ° C
Vapor pressure	29.9 hPa (20 ° C)
solubility	decomposes in water
Refractive index	1.371 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225 P: 210-262-403 + 235
Toxicological data	11700 mg kg −1 ( LD 50 ,  rat ,  oral ) > 9600 mg kg −1 ( LD 50 ,  rabbit ,  transdermal )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Methyltrimethoxysilane is a chemical compound from the group of organosilicon compounds .

Extraction and presentation

Methyltrimethoxysilane can be obtained by reacting methyltrichlorosilane with methanol .

properties

Methyltrimethoxysilane is a highly flammable, moisture-sensitive, colorless liquid with a fruity odor that decomposes in water.

use

Methyltrimethoxysilane can be used as a silica source for the synthesis of polyethyleneimine -silica (PEI-silica) organic-inorganic hybrid particles, for converting hydrophilic ceramic surfaces into hydrophobic surfaces by modifying the -OH groups and for modifying silica aerogels by inducing hydrophobicity and improving mechanical properties can be used without compromising transparency. The compound is also used as an acid scavenger, e.g. B. in the formation of substituted azulenes from alleylsilanes and tropylium tetrafluoroborate.

safety instructions

The vapors of methyltrimethoxysilane can form an explosive mixture with air ( flash point 7.7 ° C, ignition temperature 238 ° C).

Individual evidence

1. ↑ ^{a b c d e f g h i j k l} Entry on methyltrimethoxysilane in the GESTIS substance database of the IFA , accessed on January 3, 2019(JavaScript required) .
2. ↑ ^{a b} Data sheet trimethoxymethylsilane, 98% from Sigma-Aldrich , accessed on January 3, 2019 ( PDF ).
3. ↑ Data sheet trimethoxymethylsilane (PDF) from Merck , accessed on January 3, 2019.
4. ↑ Data sheet Methyltrimethoxysilane, 97% from AlfaAesar, accessed on January 3, 2019 ( PDF )(JavaScript required) .