| http://www.w3.org/ns/prov#value | - The reaction may be carried out in the absence of a solvent, for example, by fusing the two reactants, or in the presence of a diluent, such as, for example, a lower alkanol, e.g. ethanol and the like; advantageously, contact with carbon dioxide should be avoided, for example, by performing the reaction in the atmosphere of an inert gas, e.-g. nitrogen.
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