Compounds of formula ##STR1##

wherein

  • R1 and R2 are each independently of the other hydrogen; unsubstituted or mono- or poly-halo-substituted C1-C20alkyl, C1-C20alkoxy, C2-C20alkenyl, C2-C20alkynyl, C3-C18cycloalkyl, C3-C7cycloalkyl-C1-C20alkyl; hydroxy; C1-C6alkoxy-C1-C20alkyl; carboxy; C1-C6alkyloxycarbonyl; cyano; mono- or di-C1-C20alkylamino; C1-C6alkylamino-C1-C20alkyl; halogen; phenyl; unsubstituted or C1-C5alkyl-, halo- or hydroxy-substituted phenyl-C1-C20alkyl, phenoxy or phenyl-C1-C20alkoxy; or R1 and R2 form a polymethylene chain of formula —(CH2)m— wherein m=2-12;
  • R3 is unsubstituted C7-C20alkyl; or amino-, hydroxy-, carboxy- or C1-C6alkyloxycarbonyl-substituted C2-C20alkyl; C8-C18cycloalkyl; C8-C20alkenyl; C8-C20alkynyl; C3-C7cycloalkyl-C8-C20alkyl; C1-C4alkoxy-C8-C20alkyl; R7R8N—C7-C20alkyl; phenyl; phenyl-C1-C4alkyl; or phenyl-C1-C4alkoxy;
  • R4 is hydrogen; unsubstituted or C1-C5alkyl-, halo- or hydroxy-substituted C1-C20alkyl, C2-C20alkenyl, C2-C20alkynyl, C3-C20cycloalkyl, C3-C7cycloalkyl-C1-C20alkyl, C1-C20alkoxy-C1-C6alkyl or R7R8N—C1-C20alkyl, phenyl, phenyl-C1-C20alkyl or phenoxy-C1-C20alkyl;
  • R5 and R6 are each independently of the other hydrogen; C1-C20alkyl; C2-C20alkenyl; C2-C20-alkynyl; C3-C18cycloalkyl; C3-C7cycloalkyl-C1-C20alkyl; hydroxy; C2-C20alkoxy; C1-C6alkoxy-C1-C20alkyl; carboxy; C1-C6alkyloxycarbonyl; cyano; nitro; C1-C20alkylamino; C1-C20alkylaminoalkyl; C1-C20haloalkyl; C1-C20haloalkoxy; halogen; unsubstituted or C1-C5alkyl-, halo- or hydroxy-substituted phenyl, phenoxy or phenyl-C1-C20alkyl or phenyl-C1-C20alkoxy; or R5 and R6 together form a polymethylene chain of formula —(CH2)m— wherein m=2-12; and
  • R7 and R8 are each independently of the other hydrogen; C1-C20alkyl; C3-C20alkenyl; C3-C20alkynyl; C3-C7cycloalkyl; C3-C20cycloalkyl-C1-C4alkyl; phenyl; or phenyl-C1-C4alkyl are suitable for the antimicrobial treatment of surfaces.
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