Formation of the [M+NH_4]^+ Ious of Some Mouo-and Di-saccharides in Fast Atom Bombardment Mass Spectrometry

In positive-ion fast atom bombardment (FAB) mass spectrometry, when mono- and di- saccharides are mixed with an appropriate amount of NH4Cl, a highly abundan peak [M+NH4]+appers in FAB mass spectra . From the adduct ion [M+NH4]+, the molecular weights of mono- and di- saccharides can be determined definitively

间苯二酚氨解法合成间氨基苯酚工艺研究

利用间苯二酚在高温、高压下,以四水合七钼酸铵为催化剂,氨水(25%)作为氨解剂,一步氨解法合成间氨基苯酚。使用HPLC进行产率测定,工艺条件优化实验表明,在2MPa压力下,反应物配比n(间苯二酚)∶n(氨气)=1∶5,催化剂用量n(四水合七钼酸铵)∶n(间苯二酚)=1∶2.5、温度220℃、反应时间6小时,此时间氨基苯酚产率91.12%,并对催化剂套用次数进行研究,表明该催化剂可以循环使用。