Iodine Gauche Effect Induced by an Intramolecular Hydrogen Bond

FA Martins, L de Azevedo Santos… - The Journal of …, 2022 - ACS Publications
The gauche conformer in 1-X, 2-Y-disubstituted ethanes, that is, the staggered orientation in
which X and Y are in closer contact, is only favored for relatively small substituents that do …

On the importance of intramolecular hydrogen bond cooperativity in d‐glucose – an NMR and QTAIM approach

JS Lomas, L Joubert - Magnetic Resonance in Chemistry, 2017 - Wiley Online Library
The idea that hydrogen bond cooperativity is responsible for the structure and reactivity of
carbohydrates is examined. Density functional theory and gauge‐including atomic orbital …

Revisiting the Case of an Intramolecular Hydrogen Bond Network Forming Four- and Five-Membered Rings in d-Glucose

FA Martins, MP Freitas - ACS omega, 2018 - ACS Publications
The conformational behavior of cyclic monosaccharides has been widely studied over the
past years, but there is no general agreement about which effects are in fact responsible for …

Intramolecular O―H⋯ O and C―H⋯ O hydrogen bond cooperativity in D‐glucopyranose and D‐galactopyranose—A DFT/GIAO, QTAIM/IQA, and NCI approach

JS Lomas - Magnetic Resonance in Chemistry, 2018 - Wiley Online Library
Density functional theory calculations are used to compute proton nuclear magnetic
resonance (NMR) chemical shifts, interatomic distances, atom–atom interaction energies …

Cooperativity in alkane‐1,2‐ and 1,3‐polyols: NMR, QTAIM, and IQA study of O─HOH and C─HOH bonding interactions

JS Lomas - Magnetic Resonance in Chemistry, 2020 - Wiley Online Library
Proton nuclear magnetic resonance chemical shifts and atom–atom interaction energies for
alkanepolyols with 1, 2‐diol and 1, 3‐diol repeat units, and for their 1: 1 pyridine complexes …

Sulfur as a hydrogen bond donor in the gas phase: Rotational spectroscopic and computational study of 3-mercaptopropionic acid

WGDP Silva, J van Wijngaarden - Journal of Molecular Spectroscopy, 2019 - Elsevier
Rotational spectra of 3-mercaptopropionic acid (3-mpa) were measured from 6 to 18 GHz
using chirped pulse and cavity-based Fourier transform microwave (FTMW) spectroscopy …

Derivation of an accurate geometry of 2-fluoroaniline from rotational spectroscopy and computational chemistry

T Poonia, WGDP Silva, J van Wijngaarden - Journal of Molecular Structure, 2021 - Elsevier
The ground state rotational spectrum of 2-fluoroaniline was investigated using Fourier
transform microwave spectroscopy in the 6-19 GHz range. The spectrum reveals hyperfine …

Not all third-row elements experience the fluorine gauche effect: β-fluorinated organophosphorus compounds

LAF Andrade, MP Freitas - New Journal of Chemistry, 2017 - pubs.rsc.org
Conformational analyses of β-fluorinated organophosphorus compounds were theoretically
carried out to probe the role of a possible fluorine–phosphorus gauche effect in conformer …

[HTML][HTML] Conformational study of L-methionine and L-cysteine derivatives through quantum chemical calculations and 3JHH coupling constant analyses

WGDP Silva, CB Braga… - Beilstein Journal of Organic …, 2017 - beilstein-journals.org
The understanding of the conformational behavior of amino acids and their derivatives is a
challenging task. Here, the conformational analysis of esterified and N-acetylated …

Cooperativity in a cycloalkane‐1, 2/1, 3‐polyol corona: Topological hydrogen bonding in 1, 2‐diol motifs

JS Lomas, RE Rosenberg… - Magnetic Resonance in …, 2020 - Wiley Online Library
A corona, consisting of 18 carbon atoms bearing 12 hydroxy groups in a continuous
hydrogen‐bonded chain, is built up by alternating degenerate conformations of alternating …