PROCESSO PARA A PREPARACAO DE AZOIS COM ACTIVIDADE PESTICIDA

Compounds of formula I and salts thereof, in which Ar is aryl; W is N and Z is CR ; or W is CR and Z is N or CR ; A is S(O)m, -CH=CH-, O or NH; R is hydrogen, optionally substituted alkyl, halogen or R S(O)q; R and R are hydrogen, alkyl, alkenyl or alkynyl, each of which is optionally substituted, aryl, heterocyclyl, cyano, halogen, nitro, YR , S(O)2NR R , CHO and functional derivatives thereof, NR R or CYNR R ; either (i) R and R which may be the same or different, are hydrogen, optionally substituted alkyl, optionally substituted alkenyl, acyl or optionally substituted alkoxycarbonyl, and R is hydrogen, or (ii) R is as defined above and R and R form a bond or R is as defined above and R and R form a bond; R is hydrogen, alkyl, optionally substituted amino or halogen; R and R are the same or different and are hydrogen, optionally substituted alkyl, acyl or aryl, or together with the nitrogen to which they are attached, form a 5 to 7 membered ring which can contain other hetero atoms; R is optionally substituted alkyl; Y is O or S; m is 0, 1 or 2; p is 0 or 1; n is 0, 1 or 2; and q is 0, 1 or 2, with the proviso that when W is CR and Z is CR and n and p are both O, R and R are not alkyl, have pesticidal activity especially against insects, acarids and animal endoparasites.