High-resolution mass spectra of anti- and syn-isomers of acylferrocene oximes

High-resolution mass spectra of anti- and syn-acylferrocene oximes were examined at various ionizing voltages and fragmentation patterns of the oximes are presented. Significant differences between the anti- and syn-isomers were found in the fragmentation behaviour of the low voltage (15 to 20 eV) spectrum of formylferrocene oxime.