Triplet state optical and ODMR spectra of dimethyl oxalate
作者:J. P. Arrington、J. F. Landry、D. S. Tinti
DOI:10.1021/j150601a008
日期:1981.1
Cyclization of dimethyl oxalate upon electron impact
作者:J. G. Liehr、E. A. Larka、J. H. Beynon
DOI:10.1002/oms.1210160110
日期:1981.1
AbstractIsotope labelling experiments and also consecutive fragmentation investigations of metastable ions, a novel technique in mechanistic studies, have been carried out to elucidate structure and genesis of the m/z 45 ions from dimethyl oxalate as well as dimethyl carbonate. It is shown that the formation of the m/z 45 ions, \documentclassarticle}\pagestyleempty}\begindocument}$ \rmCH}}_\rm3}} \mathop \rmO}}\limits^\rm + }} = \rmCH}}_\rm2}} $\enddocument}, in the mass spectra of these compounds arises via single step processes. Mechanisms involving hydrogen transfer and subsequent formation of cyclic intermediates which then collapse to give \documentclassarticle}\pagestyleempty}\begindocument}$ \rmCH}}_\rm3}} \mathop \rmO}}\limits^\rm + }} = \rmCH}}_\rm2}} $\enddocument} directly from molecular ions are suggested. No evidence was found for a two‐step fragmentation route to m/z 45 from the molecular ions of either dimethyl oxalate or dimethyl carbonate.