15 N NMR spectra, tautomerism and diastereomerism of 4,5-dihydro-1H-1,2,3-triazoles

摘要

Despite the great number of 4,5-dihydro-1H-1,2,3-triazoles synthesized, n15nN NMR data of these heterocycles arenextremely rare. The aim of this paper is to present such data and examples of their application. The compoundsninvestigated have been synthesized according to the given references or procedures. Their n15nN NMR spectra werenmeasured at natural abundance. For some compounds, the chemical shift assignments were confirmed with the helpnof n15nN labelled material. The influences on n15nN chemical shifts of substitution pattern, solvent and concentrationnwere investigated. Additionally, some lanthanide induced shift (LIS) investigations were performed. n13nC labelledncompounds were employed as tools to provide the assignment of tautomeric structures.