| http://www.w3.org/ns/prov#value | - The person skilled in the art is well aware of many methods for nitro group reduction, whereby preferred is the reduction of intermediate compounds of general formula (4) with tin (II) chloride dihydrate in a suitable solvent, e.g. is ethanol, at temperatures ranging from room temperature to the boiling point of the solvents, whereby in the case of ethanol 80??? C. is preferred.
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