OrganicRoute有機合成路線2023-07-1720:35鈀碳或鉑碳廣泛應用於不飽和鍵（雙鍵或炔鍵）或硝基類化合物的還原，相對於金屬還原劑（鋅粉或鐵粉），其後處理更為簡單。當底物中含有I，Br，Cl的時候，這個時候還原底物中的官能團的時候，如果使用鈀碳或鉑碳方法，有脫鹵素的風險，這個時候我們往往會求助於鋅粉或鐵粉，PtO2，或Wilkinson等還原或催化還原體係。鈀碳氫化還原體係[閱讀全文]
博文
(2023-07-17 20:31:30)
OrganicRoute有機合成路線2023-07-1720:35鈀碳或鉑碳廣泛應用於不飽和鍵（雙鍵或炔鍵）或硝基類化合物的還原，相對於金屬還原劑（鋅粉或鐵粉），其後處理更為簡單。當底物中含有I，Br，Cl的時候，這個時候還原底物中的官能團的時候，如果使用鈀碳或鉑碳方法，有脫鹵素的風險，這個時候我們往往會求助於鋅粉或鐵粉，PtO2，或Wilkinson等還原或催化還原體係。鈀碳氫化還原體係[閱讀全文]
(2023-07-17 20:05:21)
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(2023-07-13 19:42:30)
SkellysolveAisessentiallyn-pentane,b28-30°/atm,閱讀全文]
(2023-07-11 18:53:00)
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(2023-07-07 21:36:43)
PACKINGACOLUMNSimplestepstoclarifyasamplebeforeapplyingittoacolumnwillavoidtheriskofblockage,reducetheneedforstringentwashingproceduresandextendthelifeofthechromatographymedium.Filterorcentrifugeallsolventsandsamplesbeforeuse. RefertoTable6.4tocalculatetheamountofdrymediumrequiredastheextentofswellingdependsuponthesolventsystem.SwellSephadex®LH-20foratleast3hatroomtemperatureinthesolventtobeus...[閱讀全文]
(2023-07-07 20:09:07)
(2023-07-05 19:10:18)
HP-20isapolymericreversephase,soitwillbehaveprettymuchlikeC18intermsofaseparationmechanism.Startwithwater,andrunagradientwithmethanolorethanolasdescribedabove.Onecanuseacids(trifluoro,formic,oraceticacid)ifneededtosharpenpeaks.Forloadingthesample,soundslikeyoursampleissolubleinwatersoaliquidloadisappropriate. [閱讀全文]
(2023-07-02 15:18:02)
Youwillknowintheorythatmostelementsnaturallyexistasmixturesofisotopes.Ifyoudidn’tbelieveit,nowyouwill.Chlorineisnormallya3:1mixtureof35Cland37Cl(hencetheobviouslyfalserelativeatomicmassof‘35.5’forchlorine)whilebromineisanalmost1:1mixtureof79Brand81Br(hencethe‘average’massof80forbromine!).Massspectrometryseparatestheseisotopessothatyougettruenotaveragemolecularweights....[閱讀全文]
