2016
DOI: 10.1155/2016/4678107
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Uncatalysed Production of Coumarin-3-carboxylic Acids: A Green Approach

Abstract: A green contribution in short reaction times with moderate yields to produce coumarin-3-carboxylic acids is offered. Five different modes to activate the reactions (microwave, near-infrared, mechanical milling, and ultrasound) were compared with mantle heating in the presence or absence of ethanol, a green solvent. Near-infrared and microwave irradiations deliver the best yields in contrast to ultrasound and mechanical milling; moreover, these four processes offered shorter reaction times in comparison with th… Show more

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Cited by 15 publications
(6 citation statements)
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“…The FT-IR spectrum of the second compound shows bands typical for N-C at 3614 cm −1 and 3534 cm −1 , C-H at 2978 cm −1 , 2935 cm −1 , 2864 cm −1 , 1448 cm −1 and 1354 cm −1 , -COO-at 1760 cm −1 , 1222 cm −1 and 1135 cm −1 as well as C = C at 1621 cm −1 and 1515 cm −1 . The results correspond to those given in the NMR spectra thus confirming aforementioned coumarin derivatives obtainment and their high purity [37]. Figure 4 presents FT-IR spectra of the coumarin-3-carboxylic acid and 7-(Diethylamino) coumarin-3-carboxylate.…”
Section: Chemical Structure Analysissupporting
confidence: 81%
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“…The FT-IR spectrum of the second compound shows bands typical for N-C at 3614 cm −1 and 3534 cm −1 , C-H at 2978 cm −1 , 2935 cm −1 , 2864 cm −1 , 1448 cm −1 and 1354 cm −1 , -COO-at 1760 cm −1 , 1222 cm −1 and 1135 cm −1 as well as C = C at 1621 cm −1 and 1515 cm −1 . The results correspond to those given in the NMR spectra thus confirming aforementioned coumarin derivatives obtainment and their high purity [37]. Figure 4 presents FT-IR spectra of the coumarin-3-carboxylic acid and 7-(Diethylamino) coumarin-3-carboxylate.…”
Section: Chemical Structure Analysissupporting
confidence: 81%
“…Figure3presents 1 H NMR spectra of the coumarin-3-carboxylic acid and 7-(Diethylamino) coumarin-3-carboxylate. The obtained data for the products correspond to other researchers' data[37].…”
supporting
confidence: 87%
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“…For organic transformations with solid catalysts, it is important to prove that no part of its active sites becomes soluble in the liquid phase of the reaction mixture for claiming a true heterogeneous process. In order to prove no leaching of the catalyst into the organic phase and thus the true heterogeneous nature of the catalyst, a control experiment was conducted. Upon stirring the reaction mixture for 30 min (ca.…”
Section: Resultsmentioning
confidence: 99%
“…Our research program is mainly focused on the implementation of green chemical procedures, mostly using non-conventional activating methods of reaction, such as nearinfrared and microwave irradiations, ultrasound, and tribochemistry to generate green processes [13][14][15][16][17][18][19][20]. It is important to highlight their corresponding greenness evaluation, by the employment of two metrics proposed by our group [21,22].…”
Section: Introductionmentioning
confidence: 99%