Determination of the Structures of Organic Molecules and Quantitative Analyses with the Field Ionization Mass Spectrometer

Characterization of cardenolides by field ionization mass spectrometry

“…(The mirror plane need not be a plane of symmetry for the starting system. )1 Such reactions include the great majority of automerizations A2£±A (1) where A is achiral, and of interconversions F^±q (2) where F is chiral2 and T is its enantiomer. The spontaneous racemization of an optically active species is almost always a narcissistic reaction; however the automerization F F is not narcissistic.…”

Fragmentation patterns of methyloxime-trimethylsilyl derivatives of constitutive mono- and disaccharide isomers analyzed by gas chromatography/field ionization mass spectrometry

“…In FI, however, an electron is removed from an analyte molecule through tunneling and, as the resulting molecular ion has little excitation, it is considered to yield little fragmentation. The history of FI itself is relatively long, and its application to organic molecules can be dated back to the 1960s . As ionization efficiency is very low in FI, however, a relatively limited number of GC/MS applications were reported prior to recent advances in instrumentation, including high‐scan speed, high‐sensitivity and high‐resolution time‐of‐flight (TOF) mass analyzers .…”

Synthesis and characterization of a nitrogen-bridged [12]annulene

“…Scheme I delineates the reactions which have led to the formation of this compound and its structural interrelationship with the starting compound 3,4,7,8tetrahydro-8b,8c-diazacyclopent[./g]acenaphthylene (2). The addition of hydrazine to compound 1, a known material,3 in the presence of oxygen, affords compound 2 and nitrogen.…”