| http://www.w3.org/ns/prov#value | - Those compounds I where R4 is hydrogen and X is a direct bond or oxygen are obtained, for example, by converting a benzyl derivative of the formula II in the presence of a base using a 3-hydroxy(dihydro)pyrazole of the formula III to the corresponding 2- (dihydro)pyrazol-3-yloxymethylene!nitrobenzene of the formula IV, then reducing IV to the N-hydroxyaniline of the formula Va and converting Va to
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