Assignment of isomeric hydroxyhydantoins: Linked-scan, tandem and high-resolution studies
摘要:
AbstractThe mass spectral fragmentation of hydroxyhydantoins was studied by a combination of high‐resolution, linked‐scan and collisionally activated decomposition (CAD) experiments. This endeavor resulted in the structural assignment of four pairs of synthetic hydroxyhydantoin isomers. A key feature in differentiating l‐methyl‐3‐ aryl‐5‐hydroxy‐2,4‐imidazolidinediones from 1‐aryl‐3‐methyl‐5‐hydroxy‐2,4‐imidazolidinediones is that under electron ionizarion (EI) conditions only the 1‐methyl‐3‐aryl‐5‐hydroxy‐2,4‐imidazolidinediones yield the [MeNHCHO]+˙ ion. The analogous [ArNHCHO]+˙ ion (where Ar is the aryl group) was present in the EI spectra of both isomers and its origins are explained by the linked‐scan and CAD experiments performed.