7402-06-4Relevant articles and documents
The catalytic asymmetric Fischer indolization
Mueller, Steffen,Webber, Matthew J.,List, Benjamin
, p. 18534 - 18537 (2012/01/31)
The first catalytic asymmetric Fischer indolization is reported. In the presence of a 5 mol % loading of a novel spirocyclic chiral phosphoric acid, 4-substituted cyclohexanone-derived phenylhydrazones undergo a highly enantioselective indolization. Efficient catalyst turnover was achieved by the addition of a weakly acidic cation exchange resin, which removes the generated ammonia. The reaction can be conducted under mild conditions and gives various 3-substituted tetrahydrocarbazoles in generally high yields.
Reactivity and Structure of (s-cis-1,3-Diene)zirconocene Complexes
Erker, Gerhard,Engel, Klaus,Krueger, Carl,Chiang, An-Pei
, p. 3311 - 3323 (2007/10/02)
For (s-cis-η4-diene)zirconocene complexes 1 the rates of thermal automerization as well as the reaction with carbon monoxide exhibit a comparable and pronounced dependence on substituents of the diene ligand.Based on X-ray structures of the complexes with 2,3-dimethyl- (1d) and 2,3-diphenylbutadiene (1f), this substituent effect is interpreted as arising from a different ?-bonding character of these ligands.Hydrolysis of the carbonylation products obtained from 1 yields cyclopentenones.
