Insecticidally active nitro compounds

A nitro compound of the formula ##STR93## wherein R.sup.1 is cyano or C.sub.1-4 alkyl,

• R.sup.2 is hydrogen, C.sub.1-6 alkyl, C.sub.3-4 alkenyl, C.sub.3-4 alkynyl, C.sub.3-8 cycloalkyl optionally substituted by C.sub.1-2 alkyl, phenyl optionally substituted by halogen, benzyl optionally substituted by halogen, C.sub.1-4 alkoxy or --(CH.sub.2).sub.n --Z, in which n is 1 or 2,
• R.sup.3 is ##STR94## in which R.sup.4 is C.sub.1-6 alkyl, C.sub.3-4 alkenyl, C.sub.3-4 alkynyl, C.sub.3-8 cycloalkyl, phenyl optionally substituted by halogen, benzyl optionally substituted by halogen, or --(CH.sub.2).sub.n --Z,
• R.sup.5 and R.sup.6 are the same or different and stand for hydrogen, C.sub.1-9 alkyl optionally substituted by at least one substituent selected from the group consisting of mercapto, C.sub.1-2 alkoxy, C.sub.3-6 cycloalkyl, amino, C.sub.1-2 mono-alkylamino, C.sub.2-4 (in total) dialkylamino, C.sub.1-2 alkoxy-carbonyl and cyano;
• or
• R.sup.5 and R.sup.6 are the same or different and stand for C.sub.3-4 alkenyl optionally substituted by halogen, C.sub.3-4 alkynyl, phenyl, benzyl, C.sub.1-4 alkoxy, hydroxy, formyl, C.sub.1-4 alkylamino, C.sub.2-4 (in total) dialkylamino, amino, acetyl, benzoyl, 6-chloronicotinoyl, pyridyl optionally substituted by chlorine or methyl, or --CH.sub.2 --Z, or
• R.sup.5 and R.sup.6 may form, together with the adjacent nitrogen atom, a pyrrolidino, piperidino, 2-methylpiperidino, morpholino, piperazino or 1-isoxazolyl group, each optionally substituted by C.sub.1-2 alkyl,
• and
• Z is a pyridyl, thiazolyl, isoxazolyl, thiadiazolyl, pyrazolyl, oxazolyl, pyrimidinyl or pyrazinyl group, each optionally substituted by halogen or C.sub.1-4 -alkyl,
• with the exception of the case were R.sup.1 is C.sub.1-4 alkyl, R.sup.2 is hydrogen or C.sub.1-4 -alkyl, R.sup.3 is --S--R.sup.4 or ##STR95## in which R.sup.4 is C.sub.1-4 alkyl, R.sup.5 and R.sup.6 are hydrogen or C.sub.1-4 alkyl, and Z is a 5- or 6-membered heterocyclic group having at least one nitrogen atom which may be substituted by halogen or C.sub.1-4 alkyl.