Determination of relative configuration in organic compounds by NMR spectroscopy and computational methods

G Bifulco, P Dambruoso, L Gomez-Paloma… - Chemical …, 2007 - ACS Publications
Stereochemical features have a profound impact on a variety of molecular properties, such
as chemical reactivity and catalytic, biological, and pharmacological activities. In light of the …

Structural characterisation of natural products by means of quantum chemical calculations of NMR parameters: New insights

FLP Costa, ACF de Albuquerque, RG Fiorot… - Organic Chemistry …, 2021 - pubs.rsc.org
In the early 2000s, the first articles regarding the calculation of NMR parameters for natural
products appeared in the literature. Since then, modelling 1H and 13C chemical shifts and …

The quantum-chemical calculation of NMR indirect spin–spin coupling constants

T Helgaker, M Jaszuński, M Pecul - Progress in Nuclear Magnetic …, 2008 - Elsevier
We present here a review of currently available methods for the calculation of indirect
nuclear spin–spin coupling constants, discussing some of the questions and difficulties …

Indirect Nonbonded Nuclear Spin–Spin Coupling: A Guide for the Recognition and Understanding of “Through-Space” NMR J Constants in Small Organic …

JC Hierso - Chemical reviews, 2014 - ACS Publications
Nuclear magnetic resonance (NMR) is widely employed for investigating a range of
important issues from the determination of novel molecular structures in inorganic, organic …

The effect of lone pairs and electronegativity on the indirect nuclear spin–spin coupling constants in NH, O, S): Ab initio calculations using optimized …

PF Provasi, GA Aucar, SPA Sauer - The Journal of Chemical Physics, 2001 - pubs.aip.org
The indirect nuclear spin–spin coupling constants of C 2 H 4, CH 2 NH, CH 2 O, and CH 2 S
were investigated by means of correlated ab initio calculations at the level of the second …

Absolute configuration determination by quantum mechanical calculation of chiroptical spectra: Basics and applications to fungal metabolites

S Superchi, P Scafato, M Gorecki… - Current medicinal …, 2018 - ingentaconnect.com
Background: Quantum mechanical simulations of chiroptical properties, such as electronic
circular dichroism (ECD), optical rotation (OR), and vibrational circular dichroism (VCD) …

Spin–spin coupling tensors as determined by experiment and computational chemistry

J Vaara, J Jokisaari, RE Wasylishen… - Progress in Nuclear …, 2002 - Elsevier
Our aim is to examine the recent experimental and theoretical research involving the nuclear
spin–spin coupling tensor, the indirect coupling mediated by the electronic structure, JMN …

New Mono‐ and Dimeric Members of the Secalonic Acid Family: Blennolides A–G Isolated from the Fungus Blennoria sp.

W Zhang, K Krohn, U Flörke, G Pescitelli… - … A European Journal, 2008 - Wiley Online Library
Abstract Blennolides A–G (2–8), seven unusual chromanones, were isolated together with
secalonic acid B (1) from Blennoria sp., an endophytic fungus from Carpobrotus edulis. This …

Recent advances in theoretical calculations of indirect spin–spin coupling constants

LB Krivdin, RH Contreras - Annual Reports on NMR Spectroscopy, 2007 - Elsevier
Recent trends in theoretical calculations of indirect spin–spin coupling constants covering
the period of May 2003–July 2006 are outlined with the emphasis on the currently used …

DFT Calculation of NMR JFF Spin−Spin Coupling Constants in Fluorinated Pyridines

V Barone, JE Peralta, RH Contreras… - The Journal of Physical …, 2002 - ACS Publications
All four isotropic contributions to the NMR fluorine− fluorine coupling constants (Fermi
contact, FC, spin-dipolar, SD, paramagnetic spin− orbit, PSO, and diamagnetic spin− orbit …