Catalysis Letters

, Volume 86, Issue 4, pp 173–177 | Cite as

Liquid-Phase Cyclization of (Phenylthio)acetaldehyde Diethylacetal to Benzo[b]thiophene over Zn2+ Ion-Exchanged Zeolite BEA

  • K.K. Cheralathan
  • M. Palanichamy
  • V. MurugesanEmail author


Cyclization of (phenylthio)acetaldehyde diethylacetal was examined in 1,2-dichloroethane and chlorobenzene solvents in the presence of H-beta zeolite and Zn2+ ion-exchanged beta zeolite under reflux conditions. Zn2+ ion-exchanged beta zeolite showed better activity than its H-form counterpart owing to its higher Lewis acidity. The cyclization proceeds via two different pathways. At lower temperature the reaction proceeds predominantly via a pathway in which deacetalization of the reactant occurs first and then the resulting aldehyde cyclizes to benzo[b]thiophene.

benzo[b]thiophene cyclization zeolite H-beta ion-exchange deacetalization 


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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • K.K. Cheralathan
    • 1
  • M. Palanichamy
    • 1
  • V. Murugesan
    • 1
    Email author
  1. 1.Department of ChemistryAnna UniversityChennaiIndia

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