Chemical ionization and high resolution electron impact mass spectra of 1,6-anhydro-3,4-O-isopropylidene-β-D-talopyranose

✍ Scribed by Derek Horton; Jon S. Jewell; Ernst K. Just; Joseph D. Wander; Rodger L. Foltz

• Publisher: John Wiley and Sons
• Year: 1974
• Tongue: English
• Weight: 708 KB
• Volume: 1
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/bms.1200010212

✦ Synopsis

The high resolution. electron impact mass spectrum of 1.6-anhydro-3.4-0-isopropyiidene-~-~-talopyranose. together with those of its derivatives having specific deuterium substitution at C-2, at C-3. at C-2 and C-3. and in the isopropylidene group. is considered in detail and compared with the ammonia and isobutane mediated chemical ionization spectra of these five compounds. From the elemental compositions of the fragment ion: and mass number shifts upon deuterium incorporation, the origin of the hydrogen atorns in each of the fragments is traced. and a detailed scheme of the main fragmentation pdthways is presected. 'pecies (C8H13043 ' 1, Of 'Ow intensity3 may be formed by scission of the C-1 -C-2 and C-2-C-3 t The structures given for the ions depicted in the Schemes in this paper are consistent with the data of the molecular formulae and the retention of isotopic labels. Alternative, isomeric structures of the Same moiecuiar formula are feasible and are not excluded, especially bonds of [MI with concomitant migration of the for the smaller ions.