Russell, Richard A.; Harrison, Peter A.; Warrener, Ronald N., Australian Journal of Chemistry, 1984, vol. 37, # 5, p. 1035 - 1041
作者:Russell, Richard A.、Harrison, Peter A.、Warrener, Ronald N.
DOI:——
日期:——
π-Bond Screening in Benzonorbornadienes: The Role of 7-Substituents in Governing the Facial Selectivity for the Diels-Alder Reaction of Benzonorbornadienes with 3,6-Di(2-pyridyl)-s-Tetrazine
作者:Ronald Warrener、Peter Harrison
DOI:10.3390/60400353
日期:——
π-bond changes from exo-attack for 21 and 23 to endo-attack for 25 and 27. The 7-spirocyclopropyl benzonorbornadiene 23 typically forms a mixture of dihydropyridazines with exo-stereo- chemistry, which undergo further stereochemical isomerisation to an exo-fused product upon acetylation (acetyl chloride in hot pyridine). Oxidation with DDQ of the dihydropyridazines individually or as mixtures gives the
Substituent effects on the efficiencies and regioselectivities of the di-π-methane rearrangement of vinyl-substituted bicyclic systems
作者:Helfried Hemetsberger、Matthias Nobbe
DOI:10.1016/s0040-4020(01)85094-8
日期:1988.1
- which were mono- or disubstituted at the vinyl moiety were synthesized. The substituent effects on the efficiencies and regioselectivities of the di-π-methanerearrangement were studied with the results: 1) The dihydrobenzobarrelene system rearranges less efficiently than the 7,7-benzonorbornadiene system. 2) The effect of the substituents on the efficiencies is more pronounced in the less efficient