Thermische Reaktionen im Massenspektrometer Modellreaktionen zur Untersuchung thermischer Umalkylierungen. 11. Mitteilung über das massenspektrometrische Verhalten von Stickstoffverbindungen

Abstract

During the introduction of an organic compound into the mass spectrometer thermal reactions can take place before the ionisation process, thus changing the structure of the compound. On the basis of known experimental results the following reactions, which are independent of electron bombardment are discussed: decarboxylation, dehydration, loss of alcohols, decarbonylation, decomposition of carboxylic esters, retro aldol reaction and similar processes, retro DIELS‐ALDER reaction, isomerisation, disproportionation, hydrogenolysis‐dehydrogenolysis, transalkylation, dimerisation, and pyrolysis of quaternary nitrogen containing compounds. Finally, the results of novel model reactions concerning thermal transalkylation are discussed.

Mass spectral rearrangements in benzylidene hippuric esters

“…This amide-ester transfer occurs at or below 150" and is thus comparable in facility with transalkylations described elsewhere. 21 The m-hydroxyl group in VI and VII, while serving as useful mass markers, did not initiate any new fragmentation modes. As was no important differences in the spectra of the cis-trans isomers I1 and IV, and VI and VII were observed.…”