Pakorn BovonsombatRameez AliChiraphorn KhanJuthamard LeykajarakulKawin Pla-onSuraj AphimanchindakulNatchapon PungcharoenpongNisit TimsueaAnchalee ArunratNapat PunpongjareornMahidol University. Mahidol University International College.2015-07-232018-04-242015-07-232018-04-242015-07-23Tetrahedron. Vol.66, No. 34 (2010), 6928-6935https://repository.li.mahidol.ac.th/handle/123456789/10952Para-Regioselective bromination of phenol and analogues, promoted by ptoluenesulfonic acid, is achieved in high to excellent yields at room tempature with N-bromosuccinimide. Chlorination with N-chlorosuccinimide and catalysed by p-toluenesulfonic acid also gives para-chlorinated phenol analogues in good yields at room tempature. Para-Bromination of phenol, promoted by p-toluenesulfonic acid, is achieved in excellent yields at room tempature with N-bromosuccinimide. p-Toluenesulfonic acid is also effective as a promoter of para-chlorination with N-chlorosuccinimide.engMahidol UniversityP-toluenesulfonic acidMonobrominationPhenolAnaloguesArticleScienceDirect