Dimethyl germanium dichloride

Structural formula
General
Surname	Dimethyl germanium dichloride
other names	Dichlorodimethylgerman; Dichlorodimethylgermanium;
Molecular formula	C 2 H 6 Cl 2 Ge
Brief description	clear, colorless liquid
External identifiers / databases
EC number	216-216-5
ECHA InfoCard	100.014.742
PubChem	73724
Wikidata	Q15628298
properties
Molar mass	173.62 g mol −1
Physical state	liquid
density	1.505 g cm −3 (25 ° C )
Melting point	−22 ° C
boiling point	123 ° C
safety instructions
H and P phrases	H: 226-314
	P: 280-305 + 351 + 338-310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dimethylgermanium dichloride is a chemical compound from the group of organic germanium compounds .

Extraction and presentation

Dimethylgermanium dichloride can be produced in high yield analogously to the Müller-Rochow synthesis by the direct reaction of germanium with methyl chloride :

{\ displaystyle \ mathrm {Ge + \ 2 \ H_ {3} CCl \ {\ xrightarrow [{Cu}] {320-350 \, {} ^ {\ circ} C}} \ \ Cl_ {2} Ge (CH_ { 3}) _ {2} \}}

In the case of a catalytic conproportionation of tetramethylgermanium with germanium tetrachloride in a ratio of 1: 1 at 150 ° C in the bomb tube , a mixture of methylgermanium trichloride and trimethylgermanium chloride is formed , which is then converted to the desired product at an even higher temperature:

{\ displaystyle \ mathrm {Ge (CH_ {3}) _ {4} + \ GeCl_ {4} \ {\ xrightarrow [{GaCl_ {3}}] {150 \, {} ^ {\ circ} C}} \ ClGe (CH_ {3}) _ {3} + \ Cl_ {3} GeCH_ {3}}}

{\ displaystyle \ mathrm {ClGe (CH_ {3}) _ {3} + \ Cl_ {3} GeCH_ {3} {\ xrightarrow [{GaCl_ {3}}] {235 \, {} ^ {\ circ} C }} \ Cl_ {2} Ge (CH_ {3}) _ {2}}}

Dimethylgermanium dichloride is a colorless, clear liquid with a refractive index of 1.46 and a flash point of 32 ° C.

↑ ^a ^b ^c ^d ^e ^f ^g ^h data sheet Dimethylgermanium dichloride from Sigma-Aldrich , accessed on April 2, 2015 ( PDF ).
↑ ^a ^b I. Schumann-Ruidisch, V. Lieb, B. Jutzi-Mebert: Gallium chloride-catalyzed conproportionation reactions of alkylgermanium halides . In: Journal of Inorganic and General Chemistry . tape 355 , no. 1-2 , November 1967, ISSN 0044-2313 , pp. 64 , doi : 10.1002 / zaac.19673550108 .