Issue 7, 2004

Epoxidation of styrene by a manganese(iii) salen complex encapsulated in an aluminium pillared clay

Abstract

The manganese(III) complex—carboxylate-[N,N′-bis(salicylaldehyde)cyclohexanediaminate]manganese(III), [Mn(salhd)CH3COO]—was encapsulated into an aluminium pillared clay (denoted as Al-WYO) using a two-step liquid phase methodology: (i) adsorption of manganese(II) acetate in ethanolic solution within Al-WYO, followed by (ii) diffusion of N,N′-bis(salicylaldehyde)cyclohexanediamine in ethanolic solution. The new material was characterised by several techniques (ICP-AES, XPS, FTIR, UV–Vis and low temperature nitrogen adsorption) which showed that in situ synthesis of the manganese(III) complex took place within the aluminium pillared clay porous structure.

The catalytic activity of the heterogenised [Mn(salhd)CH3COO] in the epoxidation of styrene was studied in acetonitrile, at room temperature, using iodosylbenzene or sodium hypochlorite as oxygen source. With PhIO the new heterogeneous catalyst showed high styrene epoxide chemoselectivity and could be reused at least 3 times without significant loss in styrene epoxide yield, suggesting that no complex leaching took place under the reaction conditions used. When sodium hypochlorite was used as oxidant, high selectivity in by-products was observed, as well as extensive leaching of the catalyst into solution. XPS spectra of the catalyst after the catalytic reaction confirm manganese complex leaching and also show a significant decrease in aluminium content, thus suggesting that partial damage of aluminium pillars took place in this reaction media, inducing complex leaching.

Graphical abstract: Epoxidation of styrene by a manganese(iii) salen complex encapsulated in an aluminium pillared clay

Article information

Article type
Paper
Submitted
06 Feb 2004
Accepted
21 Apr 2004
First published
14 Jun 2004

New J. Chem., 2004,28, 853-858

Epoxidation of styrene by a manganese(III) salen complex encapsulated in an aluminium pillared clay

I. Kuźniarska-Biernacka, A. Rosa Silva, R. Ferreira, A. Paula Carvalho, J. Pires, M. Brotas de Carvalho, C. Freire and B. de Castro, New J. Chem., 2004, 28, 853 DOI: 10.1039/B401830C

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