Sulfur ylides - 9. Resonance electron capture by molecules of keto-stabilized sulfur ylides containing a phthalimide fragment

The mass spectra of negative ions of keto-stabilized sulfur and phosphorus ylides (obtained from amino acids) and products of their thermal conversion are studied. The most characteristic peaks in the mass spectra of ylides b elong to negative molecular ions and to [M - H](-) ions. Peaks of fragment ions in the mass spectra of ylides and products of their thermal conversion coincide both in mass numbers and resonance energies.