MASS-SPECTRA OF N-ALKYL AND N,N-DIALKYLAMINOSUGAR DERIVATIVES - CHEMICAL EVIDENCE FOR THE DIFFERENT PATHWAYS OF FRAGMENTATION

The electron impact ionization mass spectra of new alkyl (and phenyl) 4,6-O-benzylidene-2-amino-N-alkyl- and N,N-dialkyl-2-deoxy-D-hexopyran osides and benzyl (and phenyl) 4,6-O-benzylidene-2,3-di-O-alkyl-D-hexo pyranosides were examined. Three general pathways of fragmentation wer e encountered. The competition the two most important pathways of frag mentation ([M - R(1)O --> ](#) and H routes) depends primarily on the nature of the aglycone and secondarily on the nature of nitrogen subst ituents. In addition, relationships between the different peak intensi ties in each pathways of fragmentation depend exclusively on the natur e of nitrogen substituents. Definitive chemical evidence for different pathways of fragmentation was found.