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Zeolite beta was dealuminated by thermal and acid treatment methods. Cyclisation of (phenylthio)acetaldehyde diethylacetal was carried out over these dealuminated zeolites with a view of obtaining benzo[b]thiophene. The yield of benzo[b]thiophene is higher in the presence of acid-dealuminated beta zeolites than in the presence of their thermally dealuminated counterparts. The product formation was...
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...
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