Diaryl ethers and processes for their preparation and herbicidal and desiccant compositions containing them

A compound represented by the formula (I) or its salts:

• 35
• wherein
• X, Y are independently hydrogen, halogen, cyano, nitro, or (C1-6)haloalkyl;
• Z is oxygen or sulfur;
• Q is selected from
• 36
• R1 is halogen;
• R2, R3, R4 and R5 are independently hydrogen, (C6)allkyl, or (C1-6)haloalkyl;
• When R3 and R5 are taken together with the atoms to which they are attached, they represent a four to seven membered substituted or unsubstituted ring optionally interrupted by O, S(O), or N—R4, and optionally substituted with one to three (Cl)alkyl groups or one or more halogen atoms;
• R6 is hydrogen, (C1-6)alkyl, (C2-6)alkenyl, (C2-6)alkynyl, (Cio6)haloalkyl, (C2-6)haloalkenyl, (C2-6)haloalkynyl, (C1-6)cyanoalkyl, (C1-6)alkoxy-(C1-6)alkyl, or (C1-6)alkylthio-(Cl)alkyl;
• A1 and A2 are independently oxygen or sulfur;
• B is CH or N;
• R7 and R8 are each independently hydrogen, (C1-6)alkyl optionally substituted with one or more halogen atoms, or (C3-C6)cycloalkyl optionally substituted with one or more halogen atoms, and when R7 and R8 are taken together with the atoms to which they are attached, they represent a four to seven membered substituted or unsubstituted ring optionally interrupted by O, S(O)0 or N—R4, and optionally substituted with one to three (C1-6)alkyl group or one or more halogen atoms;
• n is an integer of 0, 1 or 2.
• R9 and R10 are hydrogen, (C1-6)alkyl, acyl, or (C1-6)alkylsulfonyl or R9 and R10 may form a ring consisting of polymethylene, (CH2)m groups, where m is an integer of 2, 3, 4 or 5, together with the nitrogen atom of NR9R10, which may or may not have a (C1-6)alkyl substituent
• Ar is a substituted or unsubstituted aryl or heteroaryl ring;
• When Q is Q3 or Q6, substituted phenyl is excluded.