Electron impact induced fragmentations of some 2,2-disubstituted 1,3-oxathiolanes
作者:Pirjo Vainiotalo、Vesa Nevalainen
DOI:10.1002/oms.1210210804
日期:1986.8
AbstractThe electron impact induced fragmentations of nine 2,2‐disubstituted 1,3‐oxathiolanes have been studied by means of exact mass measurement and metastable ion analysis. The ring cleavage almost always takes place so that the C(2)S and C(5)O bonds are broken, leading to the most stable products. The nature of the substituents determines the primary fragmentations of molecular ions. Ring cleavage is important only if both substituents are alkyl groups or if the carbon attaching to the ring has an alkyl character. The loss of the substituent becomes the most favourable process if it is attached to the ring through the electron‐deficient carbon atom.
Substituted 2-Hydroxy-1,2-dihydropyrrol-3-ones: Fluorescent Markers Pertaining to Oxidative Stress and Aging
fluorophores generated through reactions of primary amines and various products of lipid peroxidation. In this study, model reactions of saturated aldehydes with aliphatic amines in the presence of peroxides were found to generate structurally unusual fluorescent compounds. Substitution of a lysine-containing peptide for simpler amines has also yielded similar fluorescence. The spectral excitation and emission