Moist kaolin catalyses the regioselective and high-yielding chlorination and bromination of C6H5OR (R=C1–C8 alkyl, But, allyl, cyclohexyl, benzyl) to 4-XC6H4OR (X=Cl and Br, respectively) with NaClO2 and Mn(acac)3 in CH2Cl2 in the absence and presence of NaBr, respectively, under mild and neutral conditions.
In Situ Formed I<sup>III</sup>-Based Reagent for the Electrophilic<i>ortho</i>-Chlorination of Phenols and Phenol Ethers: The Use of PIFA-AlCl<sub>3</sub>System
作者:Pradip D. Nahide、Velayudham Ramadoss、Kevin A. Juárez-Ornelas、Yuvraj Satkar、Rafel Ortiz-Alvarado、Juan M. J. Cervera-Villanueva、Ángel J. Alonso-Castro、Juan R. Zapata-Morales、Marco A. Ramírez-Morales、Alan J. Ruiz-Padilla、Martha A. Deveze-Álvarez、César R. Solorio-Alvarado
DOI:10.1002/ejoc.201701399
日期:2018.1.31
Highly regioselective ortho‐chlorination of phenols and phenolethers can be achieved with a mixture of PhI(OTFA)2 and AlCl3 in moderate to good yields. The reproducibility of this method has also been demonstrated on gram‐scale. This new chlorinating reagent can be stored at least for two weeks at 4 °C without losing its reactivity.
Efficient Halogenation of Aromatic Systems UsingN-Halosuccinimides in Ionic Liquids
作者:J. S. Yadav、B. V. S. Reddy、P. S. R. Reddy、A. K. Basak、A. V. Narsaiah
DOI:10.1002/adsc.200303229
日期:2004.1
rapid and highly regioselective green protocol has been developed for the halogenation of aromatic systems with N-halosuccinimides using room temperature ionic liquids (ILs) as novel and recyclable reaction media to produce the corresponding halogenated aromatic compounds in high to quantitative yields. N-Halosuccinimides show enhanced reactivity in ionic liquids thereby reducing the reaction times