Post-synthesis organo-sylanation of mesostructured FSM-16 for chiral Mn(III) salen catalyst anchoring

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Pankaj Das (Author) Other; Ana Rosa Silva (Author) Other; Ana P Carvalho (Author) Other; Joao Pires (Author) Other; Cristina Freire (Author) FCUP

Journal

Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects

Vol. 329

Pages: 190-197

ISSN: 0927-7757

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 8 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-TY7

DOI: 10.1016/j.colsurfa.2008.07.008

Abstract (EN): The mesoporous FSM-16 material was chemically modified with two spacers, namely 3-aminopropyltriethoxysilane (APTES) or 4-triethoxysilylaniline (TESA) to anchor the Jacobsen catalyst derivative (CAT 1) through coordinative bond of the amine group of the spacer to the metal centre. The resulting heterogeneous catalysts were tested in the asymmetric epoxidation at low temperature, of three alkenes - styrene, alpha-methyl-styrene and 6-cyano-2,2-dimethylchromene - using m-CPBA/NMO as oxygen source. The nitrogen elemental analysis showed that a much higher amount of APTES than TESA was anchored onto the FSM-16. The FSM-16 material with grafted APTES has the double amount of CAT I anchored than the FSM-16 material with grafted TESA. The pore size distribution analysis of the nitrogen adsorption isotherms shows that TESA, APTES and CAT I catalyst are anchored inside the pores of the FSM-16 material. Under the same experimental condition in the asymmetric epoxidation of styrene, alpha-methyl-styrene and 6-cyano-2,2-dimethylchromene, the APTES based materials showed better activity in both, conversion and enantiomeric excess, than TESA based materials.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8