Determination of Carboxylic Acid Anhydrides by Reaction with Morpholine

1955 ◽  
Vol 27 (9) ◽  
pp. 1464-1465 ◽  
Author(s):  
J. B. Johnson ◽  
G. L. Funk
Keyword(s):  
Carboxylic Acid ◽  
Acid Anhydrides

Spectrophotometric and titrimetric determination of carboxylic acid anhydrides

1984 ◽  
Vol 56 (12) ◽  
pp. 2157-2160 ◽  
Author(s):  
Krishna K. Verma ◽  
Pramila. Tyagi
Keyword(s):  
Carboxylic Acid ◽  
Titrimetric Determination ◽  
Acid Anhydrides

The Pyridine-Catalysed Acylation of Pine Sapwood and Phenolic Model Compounds with Carboxylic Acid Anhydrides. Determination of Activation Energies and Entropy of Activation

Holzforschung ◽  
2002 ◽  
Vol 56 (2) ◽  
pp. 150-156 ◽  
Author(s):  
Callum A. S. Hill ◽  
A.N. Papadopoulos
Keyword(s):  
Molecular Weight ◽  
Carboxylic Acid ◽  
Activation Energies ◽  
Hydroxyl Groups ◽  
Void Space ◽  
Substantial Evidence ◽  
Model Compounds ◽  
Entropy Of Activation ◽  
Acid Anhydrides

Summary The reaction activation energies and entropies have been determined for the catalysed reaction of pyridine swollen pine sapwood samples and phenolic model compounds (in solution) with a homologous series of carboxylic acid anhydrides. With wood samples, the activation energy (Ea) was largest for the reaction of ethanoic anhydride (ca. 40 kJ mol−1), and decreased as the molecular weight of the anhydride increased (to ca. 10 kJ mol−1 with hexanoic anhydride). With the model compounds, there was no substantial evidence for such a relationship between molecular weight of anhydride and Ea. Values for the entropy of activation for reaction with wood were on the order of −300 J K−1 mol−1, whereas values for reaction with the model compounds were generally on the order of −−220 to −260 JK−1 mol−1. The activation energies of diffusion (Eadiff) for the anhydride series in Corsican and Scots pine have also been determined, these varied from ca. 7 to 19 kJ mol−1. No correlation was found between Eadiff and anhydride, nor between Eadiff and wood species. The results are interpreted by considering the void space created around the reactive hydroxyl groups through swelling of the cell wall with pyridine.

Determination of Carboxylic Acid Anhydrides in Presence of Their Acids

1951 ◽  
Vol 23 (11) ◽  
pp. 1717-1718 ◽  
Author(s):  
Sidney Siggia ◽  
J Gordon Hanna
Keyword(s):  
Carboxylic Acid ◽  
Acid Anhydrides
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