Failure of the CNDO/2 method for predicting the conformations in some systems with “localized” bonds
✍ Scribed by A. Veillard
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 307 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Results from the literature show that the CND0/2 method fails to represent adequately the conformational properties of the molecules &A-BH,, and their substituted derivatives, when both atoms A and B bezr one or two lone pairs. This % in contradicticn with the cIaim that the CNDO/2 method isg~rrcrall~' valid for molecules which may bc considered as having only "localized" bonds.
📜 SIMILAR VOLUMES
The NOESY spectrum and vicinal coupling constants of t(4)-acetoxy-3,3-dimethyl-r(2),c(6)-diphenyl-Nacetylpiperidine suggest that the compound adopts a chair conformation with axial phenyl groups. The vicinal coupling constants of t(4)-acetoxy-r(2),c(6)-diphenyl-N-acetylpiperidine could be accounted
Molybdenum(CO) 3 compounds / Conformational ensembles in solution / Modelling NOE contacts / MM2\* Force field calculations / Packing forces NMR-NOE analysis of the three compounds (RRS/SSR)-observed and calculated NOE distances is highly satisfactory in each case (rms = 0.2 A ˚to 0.3 A ˚). By a st