New Procedure for the Preparation of Cellulose Esters with Aromatic Carboxylic Acids
نویسنده
چکیده
Esterification of cellulose with subs t i tu ted or unsubs t i tu ted benzoic acids in t he system of pyridine containing methanesulfonyl chloride at various reaction conditions was investigated. Cellulose could be readily acylated with 2-nitro-, 3-nitro-, 4-nitro-, and 4-azidobenzoic acids to form: 0-(2nitrobenzoyl)cellulose (DS = 3), 0-(3-nitrobenzoyl)celhilose (DS = 3), 0-(4-nitrobenzoyl)cellulose (DS = 2), and 0-(4-azidobenzoyl)cellulose (DS = 1), respectively. In t he case of benzoic acid, the mixed ester O-benzoyl-0-(methanesulfonyl) cellulose with DS « 0.9 was prepared. 1 3 C N M R spectroscopy analysis was performed on hydrolyzed samples in DMSO. All p roduc ts were characterized by bo th elemental and F T I R analyses. T h e derivatives are partially soluble in usual organic solvents, such as dimethyl sulfoxide and chloroform.
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