Übersetzung für "Tetrachloromethane" in Deutsch

Subsequently the tetrachloromethane is removed by distillation.

Chlorobenzene, tetrachloromethane or ethylene chloride is preferably used.

After addition of 3.7 g of tetrachloromethane, the reaction mixture was refluxed for 2 hours.

After 30 minutes at -70° C., 2.3 g of tetrachloromethane are added.

After separation of the aqueous phase, the product solution in tetrachloromethane was analyzed by gas chromatography.

The solids content was subsequently filtered off and washed two more times using tetrachloromethane.

Suitable regulators include, for example, dodecanethiols, thioglycolic acid esters, tetrachloromethane and tribromomethane.

Halogenated hydrocarbons are typically tetrachloromethane, methylene chloride, trichloroethylene, tetrachloroethane or chlorobenzene.

The crystalline residue is recrystallised from tetrachloromethane.

In it, tetrachloromethane is used for chlorination as well.

Suitable chlorinating agents are chlorine in a solvent, e.g. tetrachloromethane.

Preference is given to working with use of trichloromethane or tetrachloromethane.

Also, halogen-containing compounds such as tetrachloromethane or benzyl bromide may be used as molecular weight regulators.

It is furthermore possible to use halogenated hydrocarbons as regulators, such as bromotrichloromethane and tetrachloromethane.

Aliphatic chlorohydrocarbons such as dichloromethane, chloroform, tetrachloromethane, 1,2-dichloroethane and polychloroethanes are preferred.

Within twenty minutes, 7.9 g of pyridine in 8 ml of tetrachloromethane is instilled in the boiling solution.

Tetrachloromethane, which is toxicologically unsafe, has also been similarly used (CS 164 706).

The obvious synthetic route from tetrachloromethane does not yield the desired product.

Specific examples are hexane, toluene, 1,2-dichloroethane, dichloromethane, tetrachloromethane or chlorobenzene.

Diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, trichloromethane and/or tetrachloromethane are preferred.

Halogenated solvents are especially selected from the group consisting of dichloromethane, chloroform, tetrachloromethane.

The residue is extracted twice with 300 ml of hot tetrachloromethane each time, and the combined filtrates are concentrated.

In addition, chlorinated aliphatic hydrocarbons, for example methylene chloride, chloroform, tetrachloromethane, can be used.

C 1968, 1874 describes the preparation by reaction of p-toluenesulphonyl iodide with copper in tetrachloromethane.

This reaction can be conducted in the absence of further solvents or in the presence of inert solvents such as chloroform, methylene chloride, tetrachloroethane, tetrachloromethane, toluene, diethyl ether, tetrahydrofuran, dioxane, etc.

Suitable solvents are, for example, di-, tri- and tetrachloromethane, 1,1,2,2-tetrachloroethane, dioxan, tetrahydrofuran, benzene or toluene.

The following compounds may be individually mentioned as examples of the polyhalogenoalkanes which can be used according to the invention: tetrachloromethane, tetrabromomethane, chlorotribromomethane, dichlorodifluoromethane, bromochlorodifluoromethane, iodotrichloromethane, 1,1,1-trichloro-trifluoroethane, 1,1,1-tribromotrifluoroethane, 1,1-dibromo-tetrafluoroethane, 2,2-dibromo-1,1,1,3,3,3-hexafluoropropane, 1,1,1,3-tetrachlorotetrafluoropropane and 1,1,1-trichloropentafluoropropane.

Suitable inert solvents include, for example, ethers (such as diethyl ether, diisopropyl ether, dioxane, or tetrahydrofuran), dipolar aprotic solvents (such as acetonitrile, dimethylformamide, hexamethylphosphoric triamide, dimethyl sulfoxide, or sulfolane), aromatic hydrocarbons (such as benzene, toluene, or xylene), chlorinated hydrocarbons (tetrachloromethane, chloroform, dichloromethane, tetrachloroethane), and mixtures of the aforementioned solvents, especially acetonitrile and pyridine.

Only chloroform, which occurs after two reaction steps from tetrachloromethane, is relevant as a waste product for the assessment of the atomic economy.