THE ENE REACTION OF TRISUBSTITUTED ALKENES WITH ELECTRON-DEFICIENT NITRILES IN THE PRESENCE OF BORON TRICHLORIDE
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1985.575
日期:1985.5.5
The ene reaction of trisubstitutedalkenes with electron-deficient nitriles proceeds smoothly in the presence of boron trichloride to afford β,γ-unsaturated ketones in high yields. Investigation of the stereochemistry of the ene products suggests that this ene reaction is a concerted one. Similar reactions of cyclic trisubstitutedalkenes are also described.
Iridium-Catalyzed Asymmetric Hydrogenation of Unfunctionalized, Trialkyl-Substituted Olefins
作者:Aie Wang、Rui P. A. Fraga、Esther Hörmann、Andreas Pfaltz
DOI:10.1002/asia.201000595
日期:2011.2.1
Chiral iridium complexes with bicyclic pyridine‐basedN,P ligands have emerged as efficient catalysts for the enantioselective hydrogenation of unfunctionalized trialkyl‐substituted olefins. Optimization of the reaction conditions by variation of the solvent, pressure, and temperature led to enantiomeric excesses of up to 99 %. Three pure alkenes, (E)‐2‐cyclohexyl‐2‐butene and (E)‐ and (Z)‐3,4‐dimethyl‐2‐pentene
Steric Effects in Photoinduced Electron Transfer Reaction of Halogenated 1,4-Benzoquinones with Donor Olefins
作者:Ken Kokubo、Takayoshi Masaki、Takumi Oshima
DOI:10.1021/ol006080t
日期:2000.6.1
The photoinduced electron transfer reaction of halogenated 1,4-benzoquinones with 2,3-dimethyl-2-butene or 3,4-dimethyl-2-pentene gave the primary, secondary, and tertiary monoallylethers of hydroquinones, with the product distributions highly dependent on the steric nature of quinones and olefins.