1209-61-6Relevant articles and documents
USE OF MOLECULAR MECHANICS CALCULATIONS AND VARIOUS NMR SPECTROSCOPIC METHODS TO DETERMINE CONFIGURATION AND CONFORMATION IN A SOLUTION OF DIHYDROCARYOPHYLLENE EPOXIDE
Tkachev, A. V.,Toropov, O. V.,Sal'nikov, G. E.,Gatilov, Yu. V.,Bagryanskaya, I. Yu.
, p. 220 - 227 (2007/10/02)
For the case of dihydrocaryophyllene epoxide it was shown that molecular mechanics can be used in conjunction with various NMR spectroscopic methods for the determination of the configuration and conformation in solutions of compounds containing medium-sized rings.The essential features of the demonstrated approach are as follows: 1) The use of fragment-by-fragment conformational analysis to narrow the range of calculated structutes; 2) optimization of the geometry of the selected structutes by molecular mechanics; 3) calculation of the parameters of the 1H NMR spectra (the spin-spin coupling constants, the chemical shifts induced by additions of shift reagents) from the refined molecular geometry and comparison with the experimental parameters.Such a sequence of procedures made it possible to determine the configuration of the secondary methyl group and the conformation of the ninemembered ring in the molecule of dihydrocaryophyllene epoxide.The obtained configuration and conformation corresopond to the data from x-ray crystallographic analysis.