| http://www.w3.org/ns/prov#value | - In general, we find it convenient to carry out the reaction of the first step at a temperature of from 60??? C. to 150??? C., more preferably from 80??? C. to 120??? C. The time required for each of the reactions may also vary widely, depending on many factors, notably the reaction temperature and the nature of the reagents and solvent employed.
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