Oxalyl hydrazide-hydroxamic acid derivatives, their preparation and their use as fungicides

An oxalyl hydrazide-hydroxamic acid derivative of the general formula I ##STR60## where the substituents have the following meanings:

• R is C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.18 -alkenyl or C.sub.3 -C.sub.8 -alkynyl, where these radicals can carry one to five halogen atoms or one the three C.sub.1 -C.sub.4 -alkoxy groups, if appropriate together with the halogen atoms;
• monocyclic or polycyclic C.sub.3 -C.sub.10 -cycloalkyl or C.sub.3 -C.sub.10 -cycloalkylmethyl, where these rings can carry one to three C.sub.1 -C.sub.4 -alkyl groups or a cyclohexyl ring;
• monocyclic or polycyclic C.sub.5 -C.sub.10 -cycloalkenyl or C.sub.5 -C.sub.10 -cycloalkenylmethyl, where these rings can carry one to three C.sub.1 -C.sub.4 -alkyl groups or a cyclohexyl ring;
• phenyl, phenyl-C.sub.1 -C.sub.4 -alkyl, phenyl-C.sub.2 -C.sub.6 -alkenyl, where the phenyl radicals can carry one to five halogen atoms or one to three of the following groups, if appropriate together with the halogen atoms:
• hydroxyl, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -alkoxy C.sub.1 -C.sub.4 -haloalkoxy or amines,
• R.sup.1, R.sup.2 and R.sup.3 independently of one another are hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.18 -alkenyl or C.sub.3 -C.sub.8 -alkynyl, where these radicals can carry one to five halogen atoms or one the three C.sub.1 -C.sub.4 -alkoxy groups, if appropriate together with the halogen atoms;
• monocyclic or polycyclic C.sub.3 -C.sub.10 -cycloalkyl or C.sub.3 -C.sub.10 -cycloalkylmethyl, where these rings can carry one to three C.sub.1 -C.sub.4 -alkyl groups or a cyclohexyl ring;
• monocyclic or polycyclic C.sub.5 -C.sub.10 -cycloalkenyl or C.sub.5 -C.sub.10 -cycloalkenylmethyl, where these rings can carry one to three C.sub.1 -C.sub.4 -alkyl groups or a cyclohexyl ring;
• phenyl, phenyl-C.sub.1 -C.sub.4 -alkyl, phenyl-C.sub.2 -C.sub.6 -alkenyl, where the phenyl radicals can carry one to five halogen atoms or one to three of the following groups, if appropriate together with the halogen atoms:
• hydroxyl, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -haloalkoxy or amines, or
• R.sup.2 together with R.sup.3 is the group ##STR61## where R.sup.4 and R.sup.5 are one of the radicals R, R.sup.1, R.sup.2, or R.sup.3 ;
• or R.sup.4 together with R.sup.5 and the carbon atom whose substituents they are, are monocyclic or polycyclic C.sub.3 -C.sub.10 -cycloalkyl, where these rings can carry one to three C.sub.1 -C.sub.4 -alkyl groups or a phenyl ring.