Meta-substituted dioxa-alkane carboxylic acids, esters, amides and salts of diphenyl ethers

Abstract From the Canadian patent

Abstract of the Disclosure, Compounds of the Formula wherein, R1 is hydrogen, halogen, nitro or cyano;, R2 is halogen, trifluoromethyl or cyano;, R3 is hydrogen, nitro, halogen cyano, or lower, (C1-C4)alkylthio, alkylsulfinyl or alkyl-, sulfonyl;, R4 is hydrogen or lower (C1-C4) straight or branched chain alkyl;, R5 is hydrogen or lower (C1-C4) straight or branched chain alkyl;, R6 is cyano or carboxy or an agronomically acceptable salt, ester or amide thereof; n is an integer of one to four; and, m is an integer of one to four and compositions containing these compounds exhibit herbicidal activity.