| http://www.w3.org/ns/prov#value | - The two precursor materials are reacted in substantially stoichiometric amounts in a suitable solvent, such as toluene or ethanol, containing a base, such as triethylamine or piperidine, (when the indolium salt is used) at temperatures of from about 40??? C. to about 140??? C., more usually from 40??? C. to 120??? C., until the reaction is completed.
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