Dimethyl calcium

Structural formula
General
Surname	Dimethyl calcium
other names	Calcium dimethyl
Molecular formula	C 2 H 6 Approx
Brief description	white, pyrophoric solid
External identifiers / databases
Wikidata	Q55524714
properties
Molar mass	70.15 g mol −1
Physical state	firmly
solubility	practically insoluble in hydrocarbons , violent reaction with water
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dimethyl calcium is a chemical compound from the group of organic calcium compounds with the empirical formula Ca (CH ₃ ) ₂ .

Extraction and presentation

Dimethyl calcium can be obtained by salt metathesis from methyl lithium and calcium bis (trimethylsilylamide) in diethyl ether .

{\ displaystyle \ mathrm {Ca [N \ {Si (CH_ {3}) _ {3} \} _ {2}] _ {2} +2 \ LiCH_ {3} \ longrightarrow Ca (CH_ {3}) _ {2} +2 \ Li [N \ {Si (CH_ {3}) _ {3} \} _ {2}]}}

Early reports that the synthesis should also be possible directly from methyl iodide (CH ₃ I) and metallic calcium in anhydrous pyridine could not be reproduced.

properties

Dimethyl calcium is a white, amorphous and extremely pyrophoric solid that decomposes spontaneously and sometimes explosively on contact with air and water. While the compound is insoluble in hydrocarbons and diethyl ether , some solubility can be achieved in strong donor solvents such as tetrahydrofuran or tetrahydropyran . Due to the very polar nature of the Ca-C bond and the associated high reactivity with regard to ether cleavage , these solutions are only stable for a short time and at low temperatures.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f B. M. Wolf, C. Stuhl, C. Maichle-Mössmer, R. Anwander: Dimethylcalcium In: Journal of the American Chemical Society. 140, 2018, p. 2373, doi : 10.1021 / jacs.7b12984 .
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ DA Payne, RT Sanderson: CALCIUM DIMETHYL, STRONTIUM DIMETHYL, AND BARIUM DIMETHYL In: Journal of the American Chemical Society. 80, 1958, p. 5324, doi : 10.1021 / ja01552a081 .
^ HJ Emeléus, AG Shape: Advances in Inorganic Chemistry and Radiochemistry Vol. 11 . Academic Press, 1968, ISBN 978-0-12-023611-4 , pp. 343 .

[DOI10.1021/jacs.7b12984-1] ↑ ^a ^b ^c ^d ^e ^f B. M. Wolf, C. Stuhl, C. Maichle-Mössmer, R. Anwander: Dimethylcalcium In: Journal of the American Chemical Society. 140, 2018, p. 2373, doi : 10.1021 / jacs.7b12984 .

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Payne-3] DA Payne, RT Sanderson: CALCIUM DIMETHYL, STRONTIUM DIMETHYL, AND BARIUM DIMETHYL In: Journal of the American Chemical Society. 80, 1958, p. 5324, doi : 10.1021 / ja01552a081 .

[Advances_in_Inorganic-4] HJ Emeléus, AG Shape: Advances in Inorganic Chemistry and Radiochemistry Vol. 11 . Academic Press, 1968, ISBN 978-0-12-023611-4 , pp. 343 .