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|Title:||Epoxidation of (E,E)-Cinnamylideneacetophenones Using Salen Mn(III) as Catalyst|
|Authors:||Santos, Clementina M.M.|
|Publisher:||Universidade de Aveiro|
|Citation:||Santos, Clementina; Silva, Artur; Cavaleiro, José; Patonay, Támas; Lévai, Albert (2006) - Epoxidation of (E,E)-Cinnamylideneacetophenones Using Salen Mn(III) as Catalyst. In 4th Transmediterranean Colloquim on Heterocyclic Chemistry. Aveiro|
|Abstract:||Salen Mn(III) complexes are efficient and practical catalysts for the epoxidation of various α,β-unsaturated carbonyl compounds. Among common oxidants used are iodosylbenzene, sodium hipochlorite, oxone, peracids and dimethyldioxirane . Although the epoxidation of cinnamylideneacetophenones have already been reported in literature (by Julia’s epoxidation using hydrogen peroxide as oxidant  and by oxidation with dimethyldioxirane ), no studies were performed using these kind of salen Mn(III) complexes as catalysts. On these basis, we developed a study on the epoxidation of cinnamylideneacetophenones 1, catalyzed by commercially available Jacobsen’s catalyst [salen Mn(III)] and using iodosylbenzene and hydrogen peroxide as oxidants. Several experimental conditions have been used and the γ,δ-monoepoxides 2 and, in same cases, the diasteriomeric mixture of α,β:γ,δ-diepoxides 3 have been obtained. In this communication, we report the synthetic details and structural characterisation of the mono 2 and diepoxides 3 obtained.|
|Appears in Collections:||PTV - Resumos em Proceedings Não Indexados ao ISI/Scopus|
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