Pyridine Catalysis of Anhydride Hydrolysis within Carbodiimide‐Driven Reaction Networks
- Miami University, Oxford, OH (United States)
Carbodiimide-fueled reaction networks offer a versatile platform for nonequilibrium chemical systems. Typically, the carbodiimide converts a carboxylic acid to its anhydride, called “activation,” which subsequently undergoes hydrolysis, called “deactivation.” Here, we investigate pyridines with variable nucleophilicity as catalysts to control deactivation (pyridine, 4-methylpyridine, 4-methoxypyridine, and 4-dimethylaminopyridine). Reactions have been monitored by NMR spectroscopy. Although this reaction network is simple, determination of well-defined rate constants from kinetic modeling is challenging because of correlation between the parameters. This issue can be addressed by analyzing the anhydride hydrolysis independently. The rate of attack of the pyridines on the anhydride follows expected nucleophilicity trends, although this is offset by increased protonation of more-nucleophilic pyridines at typical pH's. The optimized parameters can be used to model the full carbodiimide-driven process, although the presence of the common carbodiimide EDC has unanticipated effects on the anhydride hydrolysis rate. The results offer context for controlling carbodiimide-fueled reaction networks through the choice of suitable catalysts and pH.
- Research Organization:
- Miami University, Oxford, OH (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0018645
- OSTI ID:
- 3000941
- Journal Information:
- ChemSystemsChem, Journal Name: ChemSystemsChem; ISSN 2570-4206
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure–Property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels
Controlling carbodiimide-driven reaction networks through the reversible formation of pyridine adducts
Journal Article
·
Thu Dec 12 23:00:00 EST 2019
· Journal of Organic Chemistry
·
OSTI ID:1596013
Controlling carbodiimide-driven reaction networks through the reversible formation of pyridine adducts
Journal Article
·
Fri Nov 01 00:00:00 EDT 2024
· ChemComm
·
OSTI ID:2468726