| abstract |
Compounds of the formula <IMAGE> wherein R is hydrogen; halogen; C1-C2 alkyl; C1-C2 alkoxy; nitro; cyano; C1-C2 haloalkyl; or RaSOm-wherein m is 0 or 2 and Ra is C1-C2 alkyl; R1, R2, R3 and R4 are methyl or ethyl; R5 and R6 independently are (1) hydrogen; (2) halogen; (3) C1-C4 alkyl; (4) C1-C4 alkoxy; (5) trifluoromethoxy; (6) cyano; (7) nitro; (8) C1-C4 haloalkyl; (9) RbSOn-wherein n is the integer 0, 1 or 2; and Rb is (a) C1-C4 alkyl; (b) C1-C4 alkyl substituted with halogen or cyano; (c) phenyl; or (d) benzyl; (10) -NRcRd wherein Rc and Rd independently are hydrogen or C1-C4 alkyl; (11) ReC(O)-wherein Re is C1-C4 alkyl or C1-C4 alkoxy; or (12) -SO2NRcRd wherein Rc and Rd are as defined; and (13) -N(Rc)C(O)Rd wherein Rc and Rd are as defined or R5 and R6 together are attached to adjacent carbon atoms and are methylenedioxy or ethylenedioxy and their salts. |