| http://www.w3.org/ns/prov#value | - Phosphorus oxytrichloride is preferably used.Examples of suitable solvents are toluene, xylene, chloroform and methylene chloride, in particular toluene and chloroform.Suitable bases are the abovementioned tertiary amines.The reaction with phosphorus oxytrichloride without added solvent and the reaction with trichloromethyl chloroformate in toluene or chloroform as solvent are particularly preferr
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