| 摘要 |
<p>Compounds of formulae (IA) or (IB) wherein R is hydrogen or a lower alkyl group or COR?15, R1, R2, R11 and R12¿, are hydrogen or a lower alkyl group, R?3, R4, R5 and R6¿ are hydrogen, hydroxy, halogen, a lower alkyl group, a lower alkoxy group or a mono- or di-lower alkyl amino group, NH¿2? or NR?13COR14, R7, R8, R9 and R10¿ are hydrogen, hydroxy, a lower alkyl group, a lower alkoxy group, a mono- or di-lower alkyl-amino group, or NH13COR14 wherein R?13, R14 and R15¿ are hydrogen or a lower alkyl group, enantiomers and salts thereof, with the proviso that when R is COR15 then at least one of R?3 to R10¿ are hydroxy or a mono or di-lower alkylamino group, are useful as antioxidants, within the medical and non-medical field. Many of the compounds of formulae (IA) and (IB) are new and various methods for preparing them are described.</p> |
