New tricyclic isoxazole derivatives which are useful as herbicides which have good crop plant tolerability and good effectiveness at relatively low application rates

摘要

Tricyclic isoxazole derivatives (I), and their salts are new. Tricyclic isoxazole derivatives of formula (I), and salts of (I), are new. R1 = H, M, MO, MS, MSO, MSO2, halo, CN or NO2; X = O or NR2; R2 = H, M, MO, Ph (optionally substituted by 1-3C alkyl, 1-3C alkylsulfonyl, halo, CN or NO2) or PhSO2 (optionally substituted by 1-3C alkyl, halo, CN or NO2); R3, R4 = H, M, MO, MS, MSO, MSO2, NR7R8, 2-6C alkoxyalkyl, QOCO, QCO, halo, CN, NO2, or Ph (optionally substituted by 1-3C alkyl, halo, CN or NO2); R5 = H or 1-4C alkyl; R6 = H, Q or halo; R7 = H or Q; R8 = Q or QO; l = 0, 1 or 2; n = 1 or 2; M = 1-6C alkyl or 1-6C haloalkyl; Ph = phenyl; Q = 1-6C alkyl. An Independent claim is included for preparation of (I).