Hexamethyldisilane

Structural formula
General
Surname	Hexamethyldisilane
Molecular formula	Si 2 C 6 H 18
Brief description	colorless liquid
External identifiers / databases
CAS number 1450-14-2 EC number 215-911-0 ECHA InfoCard 100.014.465 PubChem 74057 Wikidata Q1032896
properties
Molar mass	146.38 g mol −1
Physical state	liquid
density	0.715 g cm −3 (25 ° C)
Melting point	9-12 ° C
boiling point	112-114 ° C
Refractive index	1.422 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225-319-334-335 P: 210-261-305 + 351 + 338-342 + 311
Toxicological data	> 20,000 mg kg −1 ( LD 50 ,  rat ,  oral )
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

Hexamethyldisilane is a chemical compound from the group of silanes .

Extraction and presentation

Hexamethyldisilane can be obtained by reacting chlorotrimethylsilane with sodium in ethyl acetate at 200-230 ° C.

${\displaystyle \mathrm {2\ (CH_{3})_{3}SiCl+2\ Na\longrightarrow (CH_{3})_{6}Si_{2}+2\ NaCl} }$

properties

Hexamethyldisilane is a colorless liquid.

use

Hexamethyldisilane is used as a silylating reagent for allyl acetates, aryl halides and diketones. It serves as the starting material for vapor deposition during silicon carbide growth. It is also the precursor of trimethylsilyl lithium , trimethylsilyl sodium and trimethylsilyl potassium by cleavage with lithium alkyls or alcoholates .

Individual evidence

1. ↑ ^{a b c d e f g h i j k} data sheet hexamethyldisilane, 98% from Sigma-Aldrich , accessed on January 7, 2014 ( PDF ).
2. ↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 706.
3. ↑ Data sheet hexamethyldisilane, 98 +% from AlfaAesar, accessed on January 7, 2014 ( PDF )(JavaScript required) .