69076-62-6Relevant academic research and scientific papers
Graphene Oxide Promoted Oxidative Bromination of Anilines and Phenols in Water
Ghorpade, Prashant Vasantrao,Pethsangave, Dattatray Appasha,Some, Surajit,Shankarling, Ganapati Subray
, p. 7388 - 7397 (2018/07/29)
The mildly acidic and oxidative nature of graphene oxide, with its large surface area available for catalytic activity, has been explored in aromatic nuclear bromination chemistry for the first time. The versatile catalytic activity of graphene oxide (GO) has been used to selectively and rapidly brominate anilines and phenols in water. The best results were obtained at ambient temperatures using molecular bromine in a protocol promoted by oxidative bromination catalyzed by GO; these transformations proceeded with 100% atom economy with respect to bromine and high selectivities for the tribromoanilines and -phenols. Reduced graphene oxide (r-GO) was observed to form after the second recycle (third use) of GO. This technique is also effective with N-bromosuccinimide (NBS) as the brominating reagent. In the case of NBS, reactions were instantaneous and the GO displayed excellent recyclability without any loss of activity over several cycles.
N-dealkylative SNAr reaction using aromatic halides: Synthesis of dihydrobenzoxazine and tetrahydrobenzoxazepine derivatives
Pathan, Mosim Amin,Khan, Faiz Ahmed
, p. 6008 - 6020 (2017/09/18)
An efficient protocol for the synthesis of dihydrobenzoxazine and tetrahydrobenzoxazepine derivatives has been developed using haloarenes involving N-dealkylative SNAr reaction. The method employs a wide variety of substrates and features the f
Regioselective monobromination of substituted phenols in the presence of β-cyclodextrin
Suresh, Palaniswamy,Annalakshmi, Subramanian,Pitchumani, Kasi
, p. 4959 - 4967 (2008/02/02)
Cyclodextrin acts as a restricting nanovessel to enhance regioselectivity in bromination of substituted phenols such as 3-nitrophenol, 2-chlorophenol, 3-chlorophenol, and 4-chlorophenol. In contrast to solution bromination, cyclodextrin facilitates regioselective monobromination and formation of polybrominated products are substantially reduced. Selectivities in brominations are also observed in water and in the solid state. The observed results are rationalized on the basis of specific modes of inclusion of substituted phenols inside the cyclodextrin cavity and find strong support from energy minimization studies and 1H-1H NOESY.
Bromination of Phenols by Use of Benzyltrimethylammonium Tribromide
Kajigaeshi, Shoji,Kakinami, Takaaki,Tokiyama, Hajime,Hirakawa, Takahiro,Okamoto, Tsuyoshi
, p. 627 - 630 (2007/10/02)
The reaction of phenols with benzyltrimethylammonium tribromide in dichloromethane-methanol for 1 h at room temperature gave polybromophenols in good yields.
