| abstract |
Compounds of the formulan wherein R is hydrogen or a lower alkyl group, nR¹ and R² are independently selected from hydrogen or a lower alkyl group, R³, R⁴ and R⁶ are independently selected from hydrogen, halogen or a lower alkyl group, nR⁵ is hydrogen, hydroxy, halogen, a lower alkyl group, a lower alkoxy group, a mono- or di-lower alkylamino group, NH₂ or NR¹¹ COR¹², nR⁷, R⁸, R⁹ and R¹⁰ are independently selected from hydrogen, hydroxy, a lower alkyl group, a lower alkoxy group, a mono- or di-lower alkylamino group, NH₂ or NR¹¹ COR¹², nR¹¹ is a hydrogen or a lower alkyl group, nR¹² is a lower alkyl group, nwith the proviso that when R is hydrogen then at least one of the substituents R¹ to R¹⁰ 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 R¹ to R¹⁰ is not hydrogen. Many of the compounds of formula IA and IB are new and various methods for preparing them are described. |