77341-12-9Relevant academic research and scientific papers
Regiochemistry in aryl radical cyclization onto methylenecycloalkanes
Ishibashi,Kobayashi,Nakashima,Tamura
, p. 9022 - 9027 (2007/10/03)
Bu3SnH-mediated aryl radical cyclization onto methylenecycloalkanes having a phenylthio, an ester, or a nitrile group at the terminus of the alkenic bond provides exclusively exo cyclization products. The results are in sharp contrast to those reported for nonsubstituted methylenecycloalkanes, which give exclusively endo cyclization products. Formation of endo cyclization products has been suggested to be a result of a consecutive 5-exo cyclization of an aryl radical and neophyl rearrangement. The exo-selective aryl radical cyclization offers a new method for synthesizing fused aromatic compounds containing a benzylic quaternary carbon atom.
Stereoselective hydrogenation reactions in chloroaluminate(III) ionic liquids: A new method for the reduction of aromatic compounds
Adams, Christopher J.,Earle, Martyn J.,Seddon, Kenneth R.
, p. 1043 - 1044 (2007/10/03)
Stereoselective hydrogenation reactions in the ionic liquid system 1-ethyl-3-methylimidazolium chloride-AlCl3 can be performed with excellent yields and selectivities, using electropositive metals and a proton source.
Regioselective Aryl Radical Cyclization. 1. Stereocontrolled Synthesis of Linearly Condensed Hydroaromatic Carbocyclic Systems through 6-endo-ring Closures
Pal, Sitaram,Mukhopadhyaya, Jayanta K.,Ghatak, Usha Ranjan
, p. 2687 - 2694 (2007/10/02)
The stereocontrolled synthesis of trans-octahydroanthracenes 3, 11a-c, and 14a-c and trans-octahydro-5aH-cycloheptanaphthalene (27) through implementation of an efficient and highly regioselective 6-endo-trig-aryl radical cyclization of the respective 2-(o-bromoaryl)-1-methylenecyclohexanes 2, 10a-c, and 13a-c and 2-(o-bromobenzyl)-1-methylenecycloheptane (41) with tri-n-butyltin hydride id described.The radical cyclization of 2-(o-bromobenzyl)-1-methylenecyclopentane (43), in contrast, produced a mixture of the cis- and trans-hexahydro-1H-benzindenes (38) and (37).
A Highly Regioselective 6-endo-Aryl Radical Cyclisation: Stereocontrolled Synthesis of trans-Octahydroanthracenes
Pal, Sitaram,Mukherjee, Monika,Podder, Debi,Mukherjee, Alok K.,Ghatak, Usha Ranjan
, p. 1591 - 1593 (2007/10/02)
The stereocontrolled synthesis of trans-octahydroanthracenes 3, 11 and 14 through implementation of an efficient and highly regioselective 6-endo-trig-aryl radical cyclisation of the respective 2-(o-bromobenzyl)-1-methylenecyclohexanes 2, 10 and 13, with
Reduction of Polycyclic Arenes by BH Boranes, III. Partial Hydrogenation: From Anthracene to Coronene
Yalpani, Mohamed,Koester, Roland
, p. 719 - 724 (2007/10/02)
Tetrapropyldiboran(6) (TPDB) katalysiert die Hydrierung polycyclischer Arene unter Wasserstoff-Druck bei bei 200 deg C.In einigen Faellen koennen sehr hohe Ausbeuten an Hydroarenen erzielt werden .Neben unterschiedlichen kleinen Mengen an Perhydroarenen bilden sich nach langer Reaktionszeit aus saemtlichen Arenen auch C-C-Spaltungsprodukte.
