Poly (vinylpyrrolidone)-Grafted Silica as a Polymeric Cosolvent Catalyst for Organic Transformations in Organic and Aqueous Media

Ghasemi, S.; Tamami, B.; Teymoori, R.; Allahyari, H.

Poly (vinylpyrrolidone)-Grafted Silica as a Polymeric Cosolvent Catalyst for Organic Transformations in Organic and Aqueous Media

Document Type : Original Research Articles

Authors

S. Ghasemi

B. Tamami

R. Teymoori

H. Allahyari

Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 7194684795, Islamic Republic of Iran

Abstract

Poly (vinylpyrrolidone)-grafted silica as an organic-inorganic hybrid material was used as an effective heterogeneous polymeric cosolvent catalyst in organic reactions. This modified silica catalyzed nucleophilic displacement of alkyl halides for easy preparation of alkyl thiocyanates, alkyl cyanides, alkyl azides and alkyl aryl ethers. Furthermore, the catalyst was applied for the conversion of epoxides to thiranes, thiocyanohydrins and azidohydrins. These reactions were performed in acetonitrile and aqueous media to produce the corresponding products in high yields and short reaction times. The catalyst can be recovered and reused several times.

Keywords

Polymeric cosolvent

Poly (vinylpyrrolidone)

Nucleophilic substitution reactions

Ring opeing of epoxides