Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   November-December 2003 , Volume 12 , Number 6; Page(s) 507 To 513.
 
Paper: 

CHEMOSELECTIVE PROTECTION OF CARBONYL COMPOUNDS AS DITHIOACETALS USING POLYSTYRENE AND SILICA GEL SUPPORTED ALCL3 AND FECL3

 
 
Author(s):  TAMAMI B.*, PARVANAK BORUJENY K.
 
* Department of Chemistry, College of Sciences, Shiraz University, Shiraz-71454, I.R. Iran
 
Abstract: 

Cross-linked polystyrene supported AlCl3 and FeCl3 and silica gel supported AlCl3 have shown to be mild and chemoselective heterogeneous catalysts for dithioacetalization of carbonyl compounds. 1,3-Dithiolanes are obtained in excellent yields in the presence of Ps-AlCl3, Ps-FeCl3 and SiO2-AlCl3 from various aldehydes and ketones containing electron donating and withdrawing groups. The chemoselectivity of these catalysts toward aldehydes and ketones is successfully employed in the chemoselective dithioacetalization. The results show that these catalysts are able to discriminate between aldehydes and ketones, and aliphatic and aromatic ketones. The order of catalytic activities of these catalysts was SiO2- AlCl3> Ps-FeCl3> Ps-Fecl3 These polymeric catalysts are stable (as a bench top catalyst) and can be easily regenerated and used.

 
Keyword(s): POLYMER SUPPORTED LEWIS ACIDS, DITHIOACETALIZATION, CARBONYL COMPOUND, ALUMINIUM CHLORIDE, IRON(III) CHLORIDE
 
References: 
  • ندارد
 
  pdf-File tarjomyar Persian Abstract Yearly Visit 75
 
Latest on Blog
Enter SID Blog