The Formation of Allenes from gem-Dihalocyclopropanes by Reaction with Alkyllithium Reagents<sup>1,2</sup>
作者:William R. Moore、Harold R. Ward
DOI:10.1021/jo01059a013
日期:1962.12
On the relation between ring size and geometry of 2-bromo-2-cycloalkenyl acetates formed from dibromobicyclo[n.1.0]alkanes by silver acetate-catalyzed reactions. Use of 3J(C-H) couplings to assign the geometry of trisubstituted olefins
作者:Satoru Ito、Herman Ziffer、Ad Bax
DOI:10.1021/jo00357a038
日期:1986.4
Conformational Study of 1,2-Cycloundecadiene by Dynamic NMR Spectroscopy and Computational Methods
作者:Judge Brown、Diwakar M. Pawar、Eric A. Noe
DOI:10.1021/jo020317c
日期:2003.5.1
Solutions of 1 2-cycloundecadiene in propane were studied by low-temperature C-13 NMR spectroscopy. A total of 17 peaks were observed at -166.7 degreesC, corresponding to two conformations of similar populations, one of C-1 symmetry (11 peaks) and the other of C-2 symmetry. The line shapes show that the predominant pathway for exchange of the topomers (C-1 and C-1') of the C-1 conformation does not include the C-2 conformation. From the C-13 spectra, free-energy barriers of 8.38 +/- 0.15, 9.45 +/- 0.15, and 9.35 +/- 0.15 kcal/mol were determined for the C-1 to C-1', (C-1 + C-1') to C-2, and C-2 to (C-1 + C-1') conversions, respectively, at -72.2 degreesC. The NMR results for this compound are discussed in terms of the conformations predicted by molecular mechanics calculations obtained with Allinger's MM3 program. Ab initio calculations of free energies are also reported at the HF/6-311G* level for 25 conformations.
Vaidyanathaswamy,R. et al., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1977, vol. 15, p. 309 - 312
作者:Vaidyanathaswamy,R. et al.
DOI:——
日期:——
ITO, SATORU;ZIFFER, H.;BAX, A., J. ORG. CHEM., 1986, 51, N 7, 1130-1133