作者:Sridhar Komarneni、Tatsuya Kodama、William J. Paulus、C. Carlson
DOI:10.1557/jmr.2000.0182
日期:2000.6
ground waterfrom Hanford site, and fundamental studies of 2Nasup +}yields}Srsup2+} exchange equilibria revealed that a synthetic clay is extremely selective for sup 90}Sr with a high capacity for uptake. Comparative studies with existing Sr selectiveion exchangers clearly revealed that the present synthetic clay exhibited the best performance for sup 90}Sr removalfrom actual ground water collected
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
The reaction of phenols with benzyltrimethylammonium tribromide in dichloromethane-methanol for 1 h at room temperature gave polybromophenols in good yields.
苯酚与苄基三甲基三溴化铵在二氯甲烷-甲醇中在室温下反应 1 小时,以良好的收率得到多溴苯酚。
Regioselective monobromination of substituted phenols in the presence of β-cyclodextrin
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 regioselectivemonobromination and formation of polybrominated products are substantially reduced. Selectivities in brominations are also observed in water
环糊精充当限制性纳米容器,以增强取代酚(例如3-硝基苯酚,2-氯苯酚,3-氯苯酚和4-氯苯酚)的溴化反应中的区域选择性。与溶液溴化相反,环糊精促进区域选择性单溴化,多溴化产物的形成大大减少。在水中和固态下也观察到溴化反应的选择性。观察到的结果是根据环糊精腔内取代酚的特定包容模式进行合理化的,并从能量最小化研究和1 H– 1 H NOESY中获得了有力的支持。
N -dealkylative S N Ar reaction using aromatic halides: Synthesis of dihydrobenzoxazine and tetrahydrobenzoxazepine derivatives
作者:Mosim Amin Pathan、Faiz Ahmed Khan
DOI:10.1016/j.tet.2017.08.047
日期:2017.10
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 formation of CO and CN bonds in one-pot fashion. The products thus generated have been further transformed to m-terphenyls by using Suzuki coupling reaction.