| 摘要 |
A process for the preparation of 1,3-disubstituted 2-nitroguanidines of the formula I <IMAGE> (I) in which R1 is hydrogen or C1-C4alkyl, R2 is hydrogen, C1-C6alkyl, C3-C6cycloalkyl or a radical -CH2B; A is an unsubstituted or mono- to tetrasubstituted aromatic or non-aromatic, monocyclic or bicyclic heterocyclic radical, which may contain one or two substituents from the group comprising C1-C3haloalkyl having 1 to 7 halogen atoms, cyclopropyl, halocyclopropyl having 1 to 3 halogen atoms, C2-C3alkenyl, C2-C3alkynyl, C2-C3haloalkenyl and C2-C3haloalkynyl having 1 to 4 halogen atoms, C1-C3haloalkoxy having 1 to 7 halogen atoms, C1-C3alkylthio, C1-C3haloalkylthio having 1 to 7 halogen atoms, allyloxy, propargyloxy, allylthio, propargylthio, haloallyloxy, haloallylthio, cyano and nitro and one to four substituents from the group comprising C1-C3alkyl, C1-C3alkoxy and halogen; and B is optionally substituted phenyl or pyridyl, which comprises hydrolysing a compound of the formula II <IMAGE> (II) in which R3 is unsubstituted or substituted C1-C10alkyl, C3-C6cycloalkyl, phenyl or benzyl. The compounds of the formula I are suitable as intermediates for the preparation of pesticides.
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