The formation of orthoquinones in the dimethyldioxirane oxidation of phenols
作者:Jack K. Crandall、Martine Zucco、R.Scott Kirsch、David M. Coppert
DOI:10.1016/0040-4039(91)80053-9
日期:1991.9
The dimethyldioxiraneoxidation of selected phenols provides the corresponding orthoquinones. This conversion proceeds via the related arenediols, which are cleanly oxidized to the quinones by this oxidant.
Reactions of diosphenol and 3,6-dimethyl-1,2-cyclohexanedione with iodine-copper(II) acetate in acetic acid-water (5:1) at 80 °C gave the respective 3-hydroxy-2,5-dialkyl-1,4-benzoquinone in 25–80% yields. 2-t-Butyl-5-methylcyclohexanone similarly gave the corresponding 3-hydroxy-1,4-benzoquinone in 66% yield.
A New Synthesis of 3-Hydroxy-2,5-dialkyl-1,4-benzoquinone from 3-Halo-3,6-dialkyl-1,2-cyclohexanedione Using Iodine–Copper(II) Acetate
作者:C. Akira Horiuchi、Yasuto Suzuki
DOI:10.1246/bcsj.62.2919
日期:1989.9
The reaction of 3-iodo-3,6-dialkyl-1,2-cyclohexanedione (2) with iodine–copper(II) acetate in acetic acid–water (5:1) at 80 °C gave the respective 3-hydroxy-2,5-dialkyl-1,4-benzoquinone in 38–80% yields. On the other hand, the reaction of 2 with copper(II) acetate in acetic acid–water (10:1) under refluxing afforded the respective 3,3′-dihydroxy 2,2′,5,5′-tetraalkyl-4,4′-diphenoquinone (5) in 41–85%
3-碘-3,6-二烷基-1,2-环己二酮 (2) 与碘-乙酸铜 (II) 在乙酸-水 (5:1) 中在 80 °C 下反应得到各自的 3-羟基- 2,5-二烷基-1,4-苯醌的产率为 38-80%。另一方面,2与乙酸铜(II)在乙酸-水(10:1)中回流反应得到各自的3,3'-二羟基2,2',5,5'-四烷基-4, 4'-二苯醌 (5) 的产率为 41–85%。在3-溴-3,6-二烷基衍生物(3)与乙酸铜(II)的情况下,得到二苯醌衍生物和3-羟基-2,5-二烷基-1,4-苯醌。
A convenient synthesis of alkyl-substituted p-benzoquinones from phenols by a H2O2/heteropolyacid system