Cyclic hydroxamic acid derivs prodn - by electrolytic reduction of nitro-substituted carboxylic acid esters

    公开(公告)号:DE2206018A1

    公开(公告)日:1973-08-30

    申请号:DE2206018

    申请日:1972-02-09

    Applicant: HOECHST AG

    Abstract: Derivs. of formula (I): (where X is -O-, -S-, -NR'-, -CH2-, -CHR-, -C(R)2-, -CH= or -CR= in which R is lower alkyl or phenyl and R' is lower alkyl, alkanoyl or benzoyl; R2 is H, lower alkyl, phenyl, or a direct bond to X; R3 is H, lower alkyl, phenyl or benzyl; R4 - R7 are H, opt. halogenated 1 - 12C alkyl, alkenyl or alkoxy, opt. substd. aryl, aralkyl or aryloxy, halogen, CN, SO3H, OH, NO2, NH2 or mono- or di-(lower alkyl) amino; and n is 0 or 1), which are useful as inters, esp. for plant-protection agents, are prepd. without the formation of lactones by cathodically reducing nitro-substd. esters of formula (II): (where R1 is lower alkyl, benzyl or phenyl) at a cathode pH of 3 - 13 in an electrolysis cell with sepn. of cathode and anode spaces.

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