Figure 7.

Synthesis scheme of N-(3-propanoic acid)-1,8-naphthalimide and N-(4-butanoic acid)-1,8-naphthalimide esters of cellulose and the corresponding mixed naphthalimide (3-carboxypropyl)trimethylammonium chloride esters of cellulose via in situ activation of N-(3-propanoic acid)-1,8-naphthalimide, N-(4-butanoic acid)-1,8-naphthalimide, and (3-carboxypropyl)trimethylammonium chloride⁴ with N,N-carbonyldiimidazole (CDI) in N,N-dimethylacetamide/LiCl (DMA/LiCl). Reprinted from ref (46) with permission from the American Chemical Society.