Thionyl chloride
The chloride thionyl , or more exactly dichloride of thionyl has for rough Formule S O Cl 2, and has as a molar mass 118.97 g.mol-1.
Synthesis
The majority of the industrial syntheses of thionyl chloride use the reaction between the Trioxyde of sulfur and the Chlorure of sulfur.
-
SO3 + SCl2 → SOCl2 + SO2
Among the other methods, one can quote:
-
(A) SO2 + PCl5 → SOCl2 + POCl3
-
(b) SO2 + Cl2 + SCl2 → 2 SOCl2
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(c) SO3 + Cl2 + 2 SCl2 → 3 SOCl2
The reaction (A) also has as a product of the Oxychlorure of phosphorus, which resembles thionyl chloride much in many reactions.
Use
The principal use of thionyl chloride is in reagent of chlorination. It in particular makes it possible to transform the alcohol S into chlorides alkyl, according to the equation:- ROH + SOCl2 → RCl + SO2 + HCl
In the same way, the carboxylic acid are transformed into chlorides acyle:
- RCO2H + SOCl2 → RCOCl + SO2 + HCl
See too
External bonds
- international Card of chemical safety
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