Abiotic CC bond formation under environmental conditions: Kinetics of the aldol condensation of acetaldehyde in water catalyzed by carbonate ions (CO32−)
✍ Scribed by Barbara Nozière; Perrine Chabert
- Book ID
- 102449405
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 296 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
The role of C C bond-forming reactions such as aldol condensation in the degradation of organic matter in natural environments is receiving a renewed interest because naturally occurring ions, ammonium ions, NH + 4 , and carbonate ions, CO 3 2-, have recently been reported to catalyze these reactions. While the catalysis of aldol condensation by OH -has been widely studied, the catalytic properties of carbonate ions, CO 3 2-, have been little studied, especially under environmental conditions. This work presents a study of the catalysis of the aldol condensation of acetaldehyde in aqueous solutions of sodium carbonate (0.1-50 mM) at T = 295 ± 2 K. By monitoring the absorbance of the main product, crotonaldehyde, instead of that of acetaldehyde, interferences from other reaction products and from side reactions, in particular a known Cannizzaro reaction, were avoided. The rate constant was found to be first order in acetaldehyde in the presence of both CO 3 2-and OH -, suggesting that previous studies reporting a second order