Results 51 to 60 of about 296,130 (365)
5,6-dihydroxyindole-2-carboxylic acid (DHICA): a First Principles Density-Functional Study [PDF]
Chem. Phys. Lett. 402, 111 (2005)., 2004 We report first principles density functional calculations for 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and several reduced forms. DHICA and 5,6-dihydroxyindole (DHI) are believed to be the basic building blocks of the eumelanins. Our results show that carboxylation has a significant effect on the physical properties of the molecules.
arxiv +1 more source
Addition of dianions of carboxylic acids to imines. Influence of the acid in the outcome of the reaction [PDF]
, 2009 The addition of different carboxylic acids dianions to N-benzylidenebenzeneamine have been studied. The outcome of the reaction depends on the acid. Saturated ones lead to β-aminoacids with good yields and syn-selectivity whereas α,β-unsaturated ones ...
Gil Grau, Salvador +2 more
core +1 more source
Liquid-Chromatographic Methods for Carboxylic Acids in Biological Samples
Molecules, 2020 Carboxyl-bearing low-molecular-weight compounds such as keto acids, fatty acids, and other organic acids are involved in a myriad of metabolic pathways owing to their high polarity and solubility in biological fluids. Various disease areas such as cancer,
Takuya Fujiwara +3 more
doaj +1 more source
Unprecedented alkylation of carboxylic acids by boron trifluoride etherate [PDF]
, 2018 The alkylation of carboxylic acids by an ethyl moiety of boron trifluoride etherate in the absence of ethyl alcohol from the reaction system is unexpected and novel.
D. Jumbam, N. +5 more
core +2 more sources
Weak Acids Enhance Halogen Activation on Atmospheric Water’s Surfaces [PDF]
, 2011 We report that rates of I_2(g) emissions, measured via cavity ring-down spectroscopy, during the heterogeneous ozonation of interfacial iodide: I^–(surface, s) + O_3(g) + H+(s) →→ I_2(g), are enhanced several-fold, whereas those of IO·(g) are unaffected,
Colussi, Agustín J. +5 more
core +2 more sources
Deoxygenative trifluoromethylthiolation of carboxylic acids
Chemical Science, 2019 A deoxygenative trifluoromethylthiolation method produces trifluoromethyl thioesters from readily available carboxylic acids.
Runze Mao +3 more
openaire +5 more sources
Nonlinear optical properties of mono-functional 1,2-dihydro-1,2-methanofullerene[60]-61-carboxylic acid /polymer composites [PDF]
Chem. Phys. Lett. 369 (2003) 281-286, 2002 By using nanosecond laser pulses at 532-nm wavelength, we have studied the nonlinear optical properties of composites which consist of mono-functional 1,2-dihydro-1,2-methanofullerene[60]-61-carboxylic acid (FCA) and poly(styrene-co-4-vinylpyridine).
arxiv +1 more source
Nature Communications, 2022 The combination of carbene- and photocatalysis has enabled unorthodox routes to ketone syntheses, but usually requires engineered or activated substrates.
Shi-Chao Ren +6 more
doaj +1 more source
FEBS Letters, Volume 599, Issue 6, Page 876-891, March 2025.We explore 5HT2A receptor activation, a key target for psychedelic drugs, using molecular dynamics simulations. Without Gqα, the active receptor collapses to an inactive conformation, underscoring the G‐protein's role. Discovery of an intermediate “partially‐open” state and the higher affinity of ligands to the orthosteric binding site provides ...
Niklas Viohl +2 more
wiley +1 more source
Influence of ligand shape and steric hindrance on the composition of the nanocrystal ligand shell [PDF]
, 2015 Organic ligands play a key role in the synthesis of colloidal semiconductor nanocrystals or quantum dots. Generally they consist of a functional group and an aliphatic chain, with carboxylic acids, thiols and phosphonic acids as typical examples.
De Nolf, Kim +3 more
core +1 more source