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PostPosted: Thu 1 Sep - 06:43 (2016)    Post subject: Bromination Of Acetophenone Pdf Download Reply with quote




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Stavber,,and,,co-workers,,also,,demonstrated,,the,,directed,,regioselective,,-brominaiton,,of,,ketones,,with,,NBS,,in,,the,,presence,,of,,PTSA,,under,,solvent-free,,condition,,(Pravst,,et,,al.,,,2006).Over,,the,,last,,decade,,,microwave,,irradiation,,has,,been,,proven,,to,,be,,a,,powerful,,and,,well-controlled,,heating,,source,,for,,a,,wide,,variety,,of,,organic,,transformations.,,Solvents,,,,were,,,,freshly,,,,dried,,,,and,,,,degassed,,,,according,,,,to,,,,“Purification,,,,of,,,,Laboratory,,,,Chemicals”,,,,prior,,,,to,,,,use.,,,,,,,,Help,,,,Direct,,,,export,,,,,,,,,,,,Export,,,,file,,,,RIS(for,,,,EndNote,,,,,Reference,,,,Manager,,,,,ProCite),,,,BibTeX,,,,Text,,,,RefWorks,,,,Direct,,,,Export,,,,Content,,,,,,,,Citation,,,,Only,,,,,,,,Citation,,,,and,,,,Abstract,,,,Advanced,,,,search,,,,,,,,JavaScript,,,,is,,,,disabled,,,,on,,,,your,,,,browser.,,,,The,,,,-bromination,,,,of,,,,carbonyl,,,,compounds,,,,with,,,,N-bromosuccinimide,,,,was,,,,performed,,,,in,,,,a,,,,CEM,,,,Matthews,,,,WC,,,,Discover,,,,microwave,,,,reactor,,,,(model,,,,no.,,,,The,,,,NMR,,,,data,,,,were,,,,processed,,,,using,,,,the,,,,topspin,,,,program,,,,version,,,,2.1.,,,,

Carbonyl,,compounds,,can,,be,,brominated,,by,,NBS,,via,,either,,a,,radical,,pathway,,mediated,,by,,radical,,initiators,,or,,via,,ionic,,pathway,,catalyzed,,by,,acids.,,After,,30min,,,the,,reaction,,mixture,,was,,cooled,,and,,treated,,with,,10mL,,of,,distilled,,water,,,and,,extracted,,with,,3,,10mL,,of,,CH2Cl2.,,Introduction-Bromination,,,of,,,carbonyl,,,compounds,,,is,,,a,,,direct,,,method,,,for,,,the,,,preparation,,,of,,,-bromoalkanones,,,,which,,,has,,,attracted,,,considerable,,,attention,,,in,,,the,,,synthetic,,,organic,,,chemistry,,,(Larock,,,,1999,,,,Erian,,,et,,,al.,,,,2003,,,,Yunus,,,and,,,Winterfeldt,,,,2007,,,,Dogo-Isonagie,,,et,,,al.,,,,2007andSalama,,,and,,,Novak,,,,2011),,,,because,,,the,,,resulting,,,-brominated,,,products,,,are,,,important,,,intermediates,,,for,,,the,,,synthesis,,,of,,,various,,,useful,,,molecules,,,such,,,as,,,pesticides,,,,pharmaceuticals,,,,surfactants,,,and,,,biologically,,,active,,,heterocyclic,,,compounds,,,(Talegaonkar,,,et,,,al.,,,,1982andZhang,,,et,,,al.,,,,2002).,,,The,,,organic,,,layers,,,were,,,separated,,,,dried,,,over,,,MgSO4,,,,and,,,purified,,,by,,,flash,,,chromatography,,,to,,,give,,,the,,,corresponding,,,product.2.2.1.,,,Column,,,chromatography,,,purifications,,,were,,,performed,,,by,,,flash,,,chromatography,,,using,,,Merck,,,silica,,,gel,,,60.2.2.,,,HRMS,,,(ESI),,,m/z,,,197.9680,,,,calc.,,,The,,,,same,,,,group,,,,also,,,,demonstrated,,,,that,,,,the,,,,sequential,,,,treatment,,,,of,,,,carbonyl,,,,compounds,,,,with,,,,[hydroxy(tosyloxy)iodo]benzene,,,,followed,,,,by,,,,magnesium,,,,halides,,,,was,,,,an,,,,efficient,,,,method,,,,for,,,,-halogenation,,,,of,,,,ketones,,,,(Lee,,,,et,,,,al.,,,,,2004).,,,,..,,,-Bromination,,,,is,,,,also,,,,a,,,,key,,,,step,,,,for,,,,introducing,,,,a,,,,functional,,,,group,,,,into,,,,a,,,,molecule,,,,for,,,,further,,,,transformation,,,,reactions,,,,(Harwood,,,,,1962).,,,,All,,1H,,NMR,,,and,,13C,,NMR,,spectra,,were,,recorded,,using,,a,,Bruker,,AVIII,,400,,or,,AVIII,,500,,spectrometer,,in,,CDCl3,,unless,,otherwise,,noted.,,

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