| 摘要 |
<p>The derivatives in question are the products of formula I <IMAGE> R = either <IMAGE> Ra = an organic group; <IMAGE> R'A and R'B are either a hydrogen atom or an alkyl radical; ZA = single bond, sulphur, optionally oxidised, or oxygen, R3A = in particular, aryl, optionally substituted, quaternary ammonium, acetyl, carbamoyl, alkoxycarbonyl, alkyl, haloalkyl, nitrile or azido; R4 = H or OCH3; A = in particular, H, alkali metal equivalent, ester or CO2A; CO2<(-)>; n2 = integer equal to 0, 1 or 2; and the salts of the products of formula IA with inorganic or organic acids.</p> |
