In the original article, there was a mistake in Table 2. Optimization of the microwave-assisted Knoevenagel-Doebner condensation on vanillin at 50 W. as published. The values in the Eq. of base column for lines 2 to 8 are not accurate. The corrected Table 2. Optimization of the microwave-assisted Knoevenagel-Doebner condensation on vanillin at 50 W. appears below. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
Table 2
| Entry | Base | Eq. of base | Solvent | Concentration (M) | Temperature (°C) | Time (min) | % Ferulic acid | % Vinyl Phenol |
|---|---|---|---|---|---|---|---|---|
| 1 | Piperidine | 0.25 | Toluene | 0.8 | 120 | 17 | 67 | 4 |
| 2 | Piperidine | 0.5 | Toluene | 1.6 | 120 | 17 | 70 | 12 |
| 3 | Piperidine | 0.5 | Toluene | 1.6 | 90 | 30 | 72 | 2 |
| 4 | NEt3 | 0.5 | Toluene | 1.6 | 90 | 30 | 47 | 5 |
| 5 | DBU | 0.5 | Toluene | 1.6 | 90 | 30 | 57 | 7 |
| 6 | K2CO3 | 0.5 | Toluene | 1.6 | 90 | 30 | 21 | 1 |
| 7 | Piperidine | 0.5 | DMF | 1.6 | 90 | 30 | 92 | 4 |
| 8 | Piperidine | 0.5 | Cyrene® | 1.6 | 90 | 30 | 63 | 0 |
| 9 | Piperidine | 0.125 | DMF | 1.6 | 90 | 30 | 42 | 0 |
| 10 | Piperidine | 0.25 | DMF | 1.6 | 90 | 30 | 81 | 1 |
| 11 | Piperidine | 0.625 | DMF | 1.6 | 90 | 30 | 81 | 17 |
Optimization of the microwave-assisted Knoevenagel-Doebner condensation on vanillin at 50 W.
Summary
Keywords
p-hydroxycinnamic acids, ferulic acid, Sinapic acid, Caffeic acid, Coumaric acid, Knoevenagel-Doebner, microwaves
Citation
Mouterde LMM and Allais F (2018) Corrigendum: Microwave-Assisted Knoevenagel-Doebner Reaction: An Efficient Method for Naturally Occurring Phenolic Acids Synthesis. Front. Chem. 6:568. doi: 10.3389/fchem.2018.00568
Received
11 October 2018
Accepted
01 November 2018
Published
20 November 2018
Volume
6 - 2018
Edited and reviewed by
Jean-Michel Lavoie, Université de Sherbrooke, Canada
Updates
Copyright
© 2018 Mouterde and Allais.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Florent Allais florent.allais@agroparistech.fr
This article was submitted to Chemical Engineering, a section of the journal Frontiers in Chemistry
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