Electron impact induced rearrangement of 3,4-disubstituted 1,2,4-oxadiazole-5(4H)-thiones


Pihlaja K., Ovcharenko V., Agirbas H.

RAPID COMMUNICATIONS IN MASS SPECTROMETRY, vol.13, no.7, pp.625-629, 1999 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 7
  • Publication Date: 1999
  • Journal Name: RAPID COMMUNICATIONS IN MASS SPECTROMETRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.625-629
  • Kocaeli University Affiliated: No

Abstract

The fragmentation behaviour of 3,4-disubstituted 1,2,4-oxadiazole-5(4H)-thiones under electron impact (EI) can be explained by postulating a predominant rearrangement to the corresponding 3,4-disubstituted 1,2,4-thiadiazole-5(4H)-ones before further fragmentation. This postulate is confirmed by a comparison with the EI spectra of the latter compounds obtained independently by thermal rearrangement since they do not undergo a reverse rearrangement under EI, Derivatives with a butyl group at C-3 or a propyl group at N-4 fragment mainly via the [M-C4H8](+.) or [M-C3H6](+.) ions, respectively, the decomposition of which resembles closely that of the diaryl- or dimethyl-substituted derivatives. Copyright (C) 1999 John Wiley & Sons, Ltd.