MIKROBICIDER

Compounds of the formula in which R1 is hydrogen, halogen, methyl, methoxy or trifluoromethyl; n is 1 or 2; R2 is hydrogen, C1-C6alkyl, C1-C3alkyl which is substituted by halogen, cyano or methoxy, or is C2-C5alkenyl, C2-C5alkynyl, benzyl, COR5, CON(R5)R6, CSN(R5)R6, CO(OR6), CO(SR6), CS(SR5), SO2R7, PO(OR6)2 or Si(R6)3; R3 and R4 independently of one another are hydrogen, C1-C5alkyl, CH2OR6, cyclopropyl, methylcyclopropyl, C2-C5alkenyl, C2-C5alkynyl or C1-C2haloalkyl; R5 is hydrogen, C1-C6alkyl, C1-C3alkyl which is substituted by 1 to 3 halogens, C1-C3alkyl which is substituted or OR6 or SR6, or is C2-C5alkenyl, C2-C5alkenyl which is substituted by 1 to 3 halogens, C2-C5alkynyl, C3-C6cycloalkyl, phenyl or phenyl which is monosubstituted to trisubstituted by halogen, C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy, nitro or cyano; R6 is C1-C6alkyl; R7 is C1-C3alkyl, phenyl, phenyl which is monosubstituted or disubstituted by halogen, C1-C2alkyl, C1-C2haloalkyl, methoxy or nitro; including the acid addition salts, have valuable microbicidal properties. The novel active substances can be employed in crop protection for preventing crop plants being attacked by phytopathogenic microorganisms, and for controlling these pests.