Carbon-13, fluorine-19, and proton ENDOR investigations of substituent effects on lifting of orbital degeneracy in cyclopentadienyl radicals. Syntheses
Sigmatropic hydrogen shifts in aryltetraphenylcyclopentadienes
作者:G. A. Dushenko、I. E. Mikhailov、O. I. Mikhailova、R. M. Minyaev、V. I. Minkin
DOI:10.1134/s0012500816120028
日期:2016.2
solution with energy barrier ΔG180≠ = 24.8 kcal/mol. Quantum-chemical DFT calculations B3LYP/6-311++G** have shown that such migrations in 1,2,3,4,5-pentaphenylcyclopentadiene in the gas phase occur in a chiral conformation of propeller type by the mechanism of 1,5-sigmatropic hydrogen shifts with retention of configuration through asymmetric transition state with energy barrier ΔEZPE≠ = 25.9 kcal/mol
Broser,W. et al., Chemische Berichte, 1968, vol. 101, p. 69 - 83
作者:Broser,W. et al.
DOI:——
日期:——
Rio; Ranjon, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1959, vol. 248, p. 111,112
作者:Rio、Ranjon
DOI:——
日期:——
Reactions of polyarylated carbinols. 6. Kinetics of the thermal [1,5] sigmatropic phenyl and para-substituted-phenyl rearrangements in 3,4-bis[p-substituted-phenyl]-1,2,5-triphenyl-2,4-cyclopentadien-1-ols and 1-[p-substituted-phenyl]-2,3,4,5-tetraphenyl-2,4-cyclopentadien-1-ols
作者:Guy B. Oldaker、Thomas A. Perfetti、Michael A. Ogliaruso
DOI:10.1021/jo01307a036
日期:1980.9
Ranjon, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1959, vol. 248, p. 1834,1836