Pyrrole carbonitrile and nitropyrrole insecticidal and acaricidal and molluscicidal agents

A pyrrole carbonitrile or nitropyrrole compound having the structure:

• ##STR51## wherein W is CN or NO.sub.2 ;
• X is CN, Cl, Br, I or CF.sub.3 ;
• Y is Cl, Br, I or CF.sub.3 ;
• Z is Cl, Br or I;
• and
• B is ##STR52## hydrogen, C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
• one tri(C.sub.1 -C.sub.4 alkyl)silyl,
• one hydroxy,
• one cyano,
• one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
• one C.sub.1 -C.sub.4 alkylthio,
• one phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one C.sub.1 -C.sub.6 alkylcarbonyloxy group optionally substituted with one to three halogen atoms,
• one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
• one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups, or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms or one to three C.sub.1 -C.sub.4 alkoxy groups, or
• one benzyloxycarbonyl group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• C.sub.3 -C.sub.6 alkenyl optionally substituted with one to three chlorine or bromine atoms or one phenyl group,
• C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three chlorine or bromine atoms or one phenyl group or
• cyano;
• R is C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
• one hydroxy,
• one cyano,
• one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
• one C.sub.1 -C.sub.4 alkylthio,
• one phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one C.sub.1 -C.sub.6 alkylcarbonyloxy group optionally substituted with one to three halogen atoms,
• one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
• one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms or one to three C.sub.1 -C.sub.4 alkoxy groups, or
• one benzyloxycarbonyl group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
• C.sub.3 -C.sub.6 alkenyl optionally substituted with one to three halogen atoms or one phenyl group,
• C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three halogen atoms or one phenyl group,
• phenyl optionally substituted with one to three halogen atoms, one or two C.sub.1 -C.sub.4 alkyl groups, one or two C.sub.1 -C.sub.4 alkoxy groups, CF.sub.3, CN, NO.sub.2, di(C.sub.1 -C.sub.4 alkyl)amino or C.sub.1 -C.sub.4 alkanoylamino,
• phenoxy optionally substituted with one to three halogen atoms, one or two C.sub.1 -C.sub.4 alkyl groups, one or two C.sub.1 -C.sub.4 alkoxy groups, CF.sub.3, CN, NO.sub.2, di(C.sub.1 -C.sub.4 alkyl)amino or C.sub.1 -C.sub.4 alkanoylamino,
• C.sub.1 -C.sub.6 alkoxy optionally substituted with one to three halogen atoms,
• C.sub.2 -C.sub.6 alkenyloxy optionally substituted with one to three halogen atoms,
• di(C.sub.1 -C.sub.4 alkyl)amino,
• N-(C.sub.1 -C.sub.4 alkyl)-N-phenylamino or N-(C.sub.1 -C.sub.4 alkyl)-N-halophenylamino, or
• C.sub.3 -C.sub.6 polymethyleneimino;
• provided that when W is NO.sub.2 and B is hydrogen, then X and Y cannot be chlorine, bromine or iodine;
• and when W and X are CN, and Y is chlorine, bromine or iodine, then B cannot be hydrogen or unsubstituted C.sub.1 -C.sub.6 alkyl.