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Chemical ionization mass spectrometry of bifunctional compounds. The behaviour of bifunctional compounds on protonation

โœ Scribed by Hisao Nakata; Yumi Suzuki; Miyuki Shibata; Konomi Takahashi; Hideyuki Konishi; Naohito Takeda; Akira Tatematsu

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
630 KB
Volume
25
Category
Article
ISSN
1076-5174

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โœฆ Synopsis

Positive-ion chemical ionization mass spectra were measured for simple bifunctional aromatic compounds of the type p-XCH,C,H.,CH,Y, where X = NH,, NH(CH,) and N(CH,), and Y = OH and OCH,. For each cornpound, essentially only three peaks of ions, [ MHJ +, [ MH -XHI + and [ MH -YHI +, appeared. The B/E constant linked-scan spectra showed that the stable non-decomposing [MHj+ had the proton only on the nitrogen-containing functional group. From these data, the relative amounts of total protonation, the ratio of Nand O-protonation and the fraction of fragmenting [ MHI + can be calculated. The ease of protooation (protonation susceptibility) and the reactivity (fragmentation capability) of the respective functional groups are discussed.

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Positive-ion, methane-mediated chemical ionization mass spectra were measured for simple bifunctional aromatic compounds of the type m-XCH,C,H,CH,Y, where X = NH, and N(CH,),, and Y = OH and OCH,. Essentially only three peaks of ions, I MH] +, [ MH -XH 1 + and [ MH -YH I +, have appeared for each co