Results 31 to 40 of about 955,377 (284)
Molecules, 2005 Cinnamic acids have been prepared in moderate to high yields by a new direct synthesis using aromatic aldehydes and aliphatic carboxylic acids, in the presence of boron tribromide as reagent, 4-dimethylaminopyridine (4-DMAP) and pyridine (Py) as bases ...
M. Onciu, F. Tanasa, C. Chiriac
doaj +1 more source
Cocrystals Based on 4,4’-bipyridine: Influence of Crystal Packing on Melting Point
Crystals, 2021 The reactions of piperonylic acid (HPip) and cinnamic acid (HCinn) with 4,4’-bipyridine (4,4’-bipy) have been assayed using the same synthetic methodology, yielding two binary cocrystals with different acid:4,4’-bipy molar ratios, (HPip)(4,4’-bipy) (1 ...
Daniel Ejarque +3 more
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Crystals, 2018 Selected recent examples of coordination polymers (CPs) or metal-organic frameworks (MOFs) constructed from different multifunctional carboxylic acids with phenyl-pyridine or biphenyl cores have been discussed.
Jinzhong Gu +5 more
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A facile synthesis and characterization of some novel benzimidazole derivatives
Results in Chemistry, 2023 We successfully synthesized a series of novel benzimidazole derivatives with high yields in our current research study. The synthesis procedure involved condensing Ethyl 3-[[3-amino-4-(treiethylamino) benzoyl] (pyridine-5-yl) amino]-propanoate with ...
Rahul B. Shinde +7 more
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Formation of amides: one-pot condensation of carboxylic acids and amines mediated by TiCl4
Chemistry Central Journal, 2017 A general procedure for the synthesis of amides via the direct condensation of carboxylic acids and amines in the presence of TiCl4 is reported. The amidation reaction was performed in pyridine at 85 °C with a wide range of substrates providing the ...
Antonella Leggio +5 more
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Unexpected Isomerization of Oxetane-Carboxylic Acids [PDF]
, 2022 [Image: see text] Many oxetane-carboxylic acids were found to be unstable. They easily isomerized into new (hetero)cyclic lactones while being stored at room temperature or slightly heated.
Rudenko, Tymofii V. +11 more
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Cofactor regeneration by a soluble pyridine nucleotide transhydrogenase for biological production of hydromorphone [PDF]
, 2000 We have applied the soluble pyridine nucleotide transhydrogenase of Pseudomonas fluorescens to a cell-free system for the regeneration of the nicotinamide cofactors NAD and NADP in the biological production of the important semisynthetic opiate drug ...
French, C E +4 more
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, 2002 X-ray crystal structures of pyrazinic acid 1 and isomeric methylpyrazine carboxylic acids 2-4 are analyzed to examine the occurrence of carboxylic acid-pyridine supramolecular synthon V in these heterocyclic acids. Synthon V, assembled by (carboxyl)O-H···
Vishweshwar, Peddy +2 more
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Visible Light-Induced Coupling of Carboxylic Acids with Alcohols and Amines [PDF]
, 2022 The combination of activated carboxylic acids and alcohols or amines to access esters and amides, respectively, is a cornerstone of organic chemistry and has been well developed over the past century.
Karl, Scheidt +4 more
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, 2016 X-ray crystal structures of pyrazinic acid 1 and isomeric methylpyrazine carboxylic acids 2−4 are analyzed to examine the occurrence of carboxylic acid−pyridine supramolecular synthon V in these heterocyclic acids. Synthon V, assembled by (carboxyl)O−H···
Ashwini Nangia (1400761) +2 more
core +1 more source