NBS-Promoted Reactions of Symmetrically Hindered Methylphenols via <i>p</i>-Benzoquinone Methide
作者:Woonphil Baik、Hyun Joo Lee、Jung Min Jang、Sangho Koo、Byeong Hyo Kim
DOI:10.1021/jo9911185
日期:2000.1.1
Symmetrically hindered methylphenols 1 react smoothly with NBS to form transient intermediates, p-benzoquinone methides (BM), which can be further processed to give hydroxybenzaldehydes in the presence of DMSO. This reaction is initiated by the formation of the phenoxy radical, followed by disproportionation to afford BM. None of the side-chain-brominated product is observed. The existence of BM is