| abstract |
Title derivs are cpds of formula (I) (where X is halogen, 1-4C alkyl, 1-4C alkoxy, NO2 and/or H; Y is halogen, 1-4C alkyl, 1-4C alkoxy, CN, NO2 and/or H; and n is 0 or 1) and their acid addition salts. (I) in which n is 0 are obtained by reacting an alkali salt of a cpd of formula (II) with 1-chlorocarbonyl-4-methylpiperazine or by reacting a cpd of formula (II. -OH=-OCOOAr) (where Ar is opt. substituted aryl) with 1-methylpiperazine, and may be converted into (I) in which n is 1 by oxidn.n[FR2167217A1] |