| 摘要 |
Compounds of the formula <CHEM> wherein R is hydrogen or a lower alkyl group, R<1> and R<2> are independently selected from hydrogen or a lower alkyl group, R<3>, R<4> and R<6> are independently selected from hydrogen, halogen or a lower alkyl group, R<5> is hydrogen, hydroxy, halogen, a lower alkyl group, a lower alkoxy group, a mono- or di-lower alkylamino group, NH2 or NR<1><1> COR<1><2>, R<7>, R<8>, R<9> and R<1><0> are independently selected from hydrogen, hydroxy, a lower alkyl group, a lower alkoxy group, a mono- or di-lower alkylamino group, NH2 or NR<1><1> COR<1><2>, R<1><1> is a hydrogen or a lower alkyl group, R<1><2> is a lower alkyl group, with the proviso that when R is hydrogen then at least one of the substituents R<1> to R<1><0> is not hydrogen, or a salt thereof, are useful as antioxidants, within the medical and non medical field, and that when R is hydrogen, methyl or neopentyl in formula IA, then at least one of R<1> to R<1><0> is not hydrogen. Many of the compounds of formula IA and IB are new and various methods for preparing them are described. |
