| http://www.w3.org/ns/prov#value | - Advantageously, the solvent is used in an amount of from 100 to 2,000, preferably from 200 to 700, % by weight, based on the starting material ofthe formula II.Preferred acid halides are thionyl chloride, sulfur tetrafluoride, phosgene, oxalyl chloride and phosphorus tribromide, and in particular phosphorus pentachloride, phosphorus trichloride and phosphorus oxychloride.
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