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• W2020605416 abstract "Cellulose acylation by anhydrides (ethanoic to hexanoic) plus tosyl chloride, TsCl, or imidazole in LiCl/N,N-dimethylacetamide solution has been studied. Contrary to a previous claim, TsCl does not catalyze acylation. For the diazole-catalyzed reaction, N-acylimidazole is the acylating agent. Third order rate constants (k3; 40–70 °C) have been calculated from conductivity data and split, by using information from model compounds, into contributions from the primary- (k3;Prim(OH)) and secondary- (k3;Sec(OH)) hydroxyl groups of cellulose. Values of k3,Prim(OH)/k3,Sec(OH) are >1, and increase linearly as a function of increasing the number of carbon atoms of the acyl group. Rate constants and the degree of biopolymer substitution decrease on going from ethanoic- to butanoic-, then increase for pentanoic- and hexanoic anhydride, due to enthalpy/entropy compensation. Relative to the uncatalyzed reaction, the diazole-mediated one is associated with smaller enthalpy- and larger entropy of activation, due to difference of the acylating agent." @default.
• W2020605416 created "2016-06-24" @default.
• W2020605416 creator A5010873259 @default.
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• W2020605416 date "2013-02-01" @default.
• W2020605416 modified "2023-09-27" @default.
• W2020605416 title "Kinetics and mechanism of imidazole-catalyzed acylation of cellulose in LiCl/N,N-dimethylacetamide" @default.
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• W2020605416 doi "https://doi.org/10.1016/j.carbpol.2012.10.009" @default.
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