Abstract
It was established that the principal pathways in the mass-spectrometric fragmentation of dihydro-8H-pyrano (thiopyrano) — and piperidino[4′,3′∶4,5] thieno [2,3-d]-4-aminopyrimidines are associated with retrodiene fragmentation of the saturated heterocyclic ring and the loss of a hydrogen atom or the elimination of the substituent adjacent to the heteroatom of the saturated ring. The fragmentation of the substituent of the pyrimidine part of the molecule occurs only in the case of more profound stages of the fragmentation. This makes it possible to assume primary localization of the positive charge in the molecular ion in the region of the thiophene ring.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
