| http://www.w3.org/ns/prov#value | - In this case, available are a method in which a required amount of a base which is inactive to the reaction such as pyridine, piperazine and triethylamine is allowed to be present in the system to trap the by-produced hydrogen halide and a method in which it is quickly discharged in succession in the form of gas to the outside of the system during the reaction and scavenged in a water or alkali tr
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