The synthetic route to 4-substituted bisnaphthalimides consisting in reaction of 4-halonaphthalic anhydrides with alpha,omega-diaminoalkanes followed by halogen substitution with dialkylamino group is more promising than imidating coupling of 4-dialkylaminonaphthalic anhydrides for it opens wider synthetic opportunities and ensures better yields of target products. Dihalosubstituted bis-naphthalimides can be prepared by N-alkylation of the corresponding naphthalimides with polymethylene dibromides under conditions of phase-transfer catalysis in the presence of tetraalkylammonium salts.
AbstractThe electron impact induced fragmentations of some unsubstituted and chlorine‐substituted naphthalimides and bisnaphthalimides are discussed in detail with the aid of B/E and B2/E linked‐scans for metastable ion analysis and collisional activation experiments. In the case of bisnaphthalimides the more important primary decomposition routes are related to cleavages of the alkyl chain.