Herbicidal substituted 3-aryl-pyrazoles

Process for preparing a compound of Formula I:

• ##STR13## comprising reacting a vinyl ether compound of Formula C:
• ##STR14## with a R.sub.1 NHNH.sub.2 or an unsubstituted hydrazine;
• provided that when the hydrazine is unsubstituted, the resulting compound of Formula D:
• ##STR15## is reacted with an R.sub.1 -halide or di(C.sub.1-6 alkyl) sulfate;
• wherein in the above formula,
• R is an alkyl or aryl group;
• R.sub.1 is independently C.sub.1-8 alkyl;
• C.sub.3-8 cycloalkyl, cycloalkenyl, cycloalkylalkyl, or cycloalkenylalkyl;
• C.sub.2 8 alkenyl or alkynyl;
• benzyl;
• and said R.sub.1 members optionally substituted with halogen, alkoxy, or alkylthio;
• R.sub.2 is C.sub.1-6 haloalkyl;
• R.sub.3 is C.sub.1-6 alkyl, C.sub.1-6 haloalkyl, CHO or CH.sub.2 OH;
• R.sub.4 members are independently an R.sub.1 member, thioalkyl, polyalkoxyalkyl, carbamyl, halogen, amino, nitro, cyano, hydroxy, ##STR16## X is O, S(O).sub.m, NR.sub.19 or CR.sub.20 R.sub.21 ;
• Y is O, S(O).sub.m or NR.sub.22 ;
• R.sub.8-22 are hydrogen, C.sub.1-8 alkyl;
• C.sub.3-8 cycloalkyl, cycloalkenyl, cycloalkylalkyl, or cycloalkenylalkyl;
• C.sub.2-8 alkenyl or alkynyl;
• benzyl;
• or said R.sub.1 members substituted with halogen, amino, nitro, cyano, hydroxy, alkoxy, alkylthio, halogen, amino, nitro, cyano, hydroxy, aryl, aralkyl, alkaryl, carboxyl, alkoxyalkyl, alkylamino, dialkylamino, alkoxy, or carbamyl;
• m is 0-2 and
• n is 1-5.