13-Methyl-2,6-dithia[7]metacyclophane: A Useful Molecule To Connect VT NMR Results and Structure with Calculations
摘要:
Ground state energies (DFT) and H-1 and C-13 NMR chemical shifts are calculated for the conformers of 13-methyl-2,6-dithia[7]metacyclophane (1), and the results are compared with X-ray structural data and variable-temperature NMR data, including the determination of the activation barrier. Calculations predict the correct low energy conformer with good agreement with chemical shifts. bond distances, and angles. VT NMR data for the 10-tert-butyl-substituted derivative 2 indicate that it undergoes the same conformational equilibria as 1. This paper should enhance the confidence that organic chemists have in calculations to satisfactorily predict conformer energies.
13-Methyl-2,6-dithia[7]metacyclophane: A Useful Molecule To Connect VT NMR Results and Structure with Calculations
作者:Reginald H. Mitchell、Rachel Blunden、Gavin Hollett、Subhajit Bandyopadhyay、Richard Vaughan Williams、Brendan Twamley
DOI:10.1021/jo0484272
日期:2005.1.1
Ground state energies (DFT) and H-1 and C-13 NMR chemical shifts are calculated for the conformers of 13-methyl-2,6-dithia[7]metacyclophane (1), and the results are compared with X-ray structural data and variable-temperature NMR data, including the determination of the activation barrier. Calculations predict the correct low energy conformer with good agreement with chemical shifts. bond distances, and angles. VT NMR data for the 10-tert-butyl-substituted derivative 2 indicate that it undergoes the same conformational equilibria as 1. This paper should enhance the confidence that organic chemists have in calculations to satisfactorily predict conformer energies.