Structures and Rotational Barriers of a Diiodobinorsnoutane: Energetic Preference for Gauche Conformation.
J Org Chem
; 81(15): 6862-6, 2016 08 05.
Article
in En
| MEDLINE
| ID: mdl-27391283
ABSTRACT
The diiodobinorsnoutane, bi(5-iodopentacyclo[4.3.0.0(2,4).0(3,8).0(5,7)]non-4-yl) (5), exists in a sterically hindered gauche conformation rather than an anti or an averaged (freely rotating) C2v structure. Density functional theory (DFT) predictions place the gauche conformation 11 kcal/mol more stable than the anti conformation with a barrier of 17 kcal/mol connecting the minima. These are consistent with variable-temperature NMR (17.1 ± 0.8 kcal/mol) estimates and X-ray analysis. Predictions of the torsional profiles of the yet-unsynthesized bromo-, chloro-, and fluoro- analogues show a progressive lowering of the barriers.
Full text:
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Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Year:
2016
Type:
Article