Rearrangements in the cerium(IV) and manganese(III) oxidations of substituted naphthalenes and the NIH shift mechanism
作者:M.Vivekananda Bhatt、Mariappan Periasamy
DOI:10.1016/s0040-4020(01)87034-4
日期:1994.3
ammonium sulphate oxidation of 1- md 1,4- disubstituted naphthalenes gives 2- and/or 2,3- disubstituted 1,4- naphthoquinones through migration of substituents (D, Br, Ph). Similar rearrangements are also observed in the manganese(III) oxidation and also in the anodic oxidation of these substrates. The results are consistent with the proposal that these oxidations go through the formation of radical cation
1-md 1,4-二取代萘的硫酸铈铵氧化通过取代基(D,Br,Ph)的迁移产生2-和/或2,3-二取代1,4-萘醌。在锰(III)氧化以及这些基材的阳极氧化中也观察到类似的重排。结果与以下提议相吻合:这些氧化过程通过形成自由基阳离子,然后与H 2反应O,然后自由基在氧化为相应的1,4-萘醌的过程中进一步氧化为碳阳离子中间体。1,4-二苯基萘的氧化得到2,3-二苯基-1,4-萘醌或4-羟基-2,4-二苯基-1(4)H-萘酮。结果是根据这样的结论得出的,即这种重排不需要预先形成最初用于NIH转移机理的氧化芳烃中间体。