Homogeneous Esterification of Cellulose in the Mixture N-Butylpyridinium Chloride/Dimethylsulfoxide

Table 1

Reaction conditions, DS, and solubility for obtained cellulose p-nitrobenzoate.

Entry	Cellulose type	Base	Reaction time (h)	DS	Solubility
					DMSO	DMF	DMAc	H2O
1	Microcrystalline	DMAP	1.30	0.4
2	Microcrystalline	Pyridine	1.30	0.23
3	Microcrystalline	Triethylamine	1.30	0.19
4	Microcrystalline	DMAP	3.0	1.50
5	Kraft	DMAP	1.30	0.35
6	Kraft	Pyridine	1.30	0.19
7	Kraft	Triethylamine	1.30	0.12
8	Kraft	DMAP	3.0	1.42

DS was determined with ¹H-NMR method.
+, soluble; −, insoluble.