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[求助]
DMAP PA MNBAn 做衍生化試劑
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我最近在做質(zhì)譜,需要衍生化 文獻(xiàn)中這樣寫的: 4-dimethylaminopyridine (DAP), 2-methyl-6-nitrobenzoic anhydride (MNBAn), picolinic acid (PA), triethylamine (TEA), anhydrous tetrahydrofuran (THF), To prepare 1mL of picolinic acid derivatization reagent, DAP (20mg) and PA (50mg) were first dissolved in anhydrous THF (1mL). Next, MNBAn (40mg) was added to the solution and dissolved with gentle shaking for derivatization 我這樣做了之后,出現(xiàn)白色沉淀,最終得不到溶液 所用四氫呋喃保證無水了 誰知道這是怎么回事嗎? |
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