| abstract |
Novel title cpds. (I) and their novel inters. (II) (except the case where R5,R6,R7 = H and R3,R4 = methyl) have formulae (where R1 = alkyl, alkenyl or alkynyl; R2 = H, alkyl or carboxylic acyl; R3,R4 = same or different alkyl, alkenyl or alkynyl or together represent an opt. alkylated alkylene chain; R5,R6,R7 = same or different H, halo, alkyl, carboxylic acyl, -OR8, -SR8, -SO2R8, -C(OH)R9R10, cyano, nitro thiocyanato, carboxyl, esterified carboxyl, carbamoyl (the N atom being opt. substd) or -NR3R4 gp; R8 = alkyl, opt. alkylated aryl or benzyl and R9,R10 = same or different H or alkyl) including their salts. |