prov:value
| - C. The reaction time depends on the temperature and is ordinarily from 1/2 hour to 5 hours, preferably from 1 to 3 hours.Suitable organic solvents employed as reaction medium are cycloaliphatic or, preferably, aromatic hydrocarbons, for example cyclohexane, benzene, toluene or xylene; chlorinated hydrocarbons such as ethylene chloride, tetrachloroethylene, orchlorobenzenes, e.g. chlorobenzene, chl
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