Process for the preparation of 2-aryl-5-(perfluoroalkyl) pyrrole compounds from N-(perfluoroalkylmethyl) arylimidoyl chloride compounds

A compound having the structural formula II ##STR35## wherein n is an integer of 1, 2, 3, 4, 5, 6, 7 or 8;

• ##STR36## L is hydrogen or halogen;
• M and Q are each independently hydrogen, halogen, CN, NO.sub.2,
• 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, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 haloalkylthio,
• C.sub.1 -C.sub.4 alkylsulfinyl, C.sub.1 -C.sub.4 haloalkylsulfinyl,
• C.sub.1 -C.sub.4 alkylsulfonyl, C.sub.1 -C.sub.4 haloalkylsulfonyl or when M and Q are on adjacent positions they may be taken together with the carbon atoms to which they are attached to form a ring in which MQ represents the structure --OCH.sub.2 O--, --OCF.sub.2 O-- or --CH.dbd.CH--CH.dbd.CH--;
• R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen, halogen, NO.sub.2, CHO or R.sub.2 and R.sub.3 may be taken together with the atoms to which they are attached to form a ring in which R.sub.2 R.sub.3 is represented by the structure ##STR37## R.sub.4, R.sub.5, R6 and R.sub.7 are each independently hydrogen, halogen, CN or NO.sub.2 ;
• and
• X is O or S,
• provided that when A is unsubstituted phenyl, p-chloro-phenyl or p-methylphenyl, n is an integer other than 1.