| abstract |
Pivalic acid derivs of formula (I) are new. In (I), X = 0 or S; R1 = H or alkyl; and AR = opt substd phenyl or opt substd naphthyl. More specifically, R1 = H or 1-6C alkyl; AR = phenyl opt substd by 1-3 of halo, CN, N02, 1-6C alkyl, 1-6C alkoxy, 1-6C alkylthio, 1-6C haloalkyl, 1-6C haloalkoxy, 1-6C haloalkylthio (each contg up to 13 halo atoms), NR2R3 or NR2(C0R4); R2 = H or 1-6C alkyl; R3 = H, 1-6C alkyl, 1-6C alkoxy or phenyl or benzyl opt substd by one or more halo; and R4 = 1-6C alkyl or 1-6C alkoxy (both opt substd by up to 13 halo atoms); 3-6C cycloalkyl opt substd by halo, alkyl or haloalkyl; benzyl or phenyl opt substd by halo. USE - (I) and (II) may be used as defoliants, dessicants and weed killers. They may be used in combination with other herbicides. |