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001-es BibID:	BIBFORM001228
Első szerző:	Santos, Clementina M. M.
Cím:	Epoxidation of (E,E)-cinnamylideneacetophenones with hydrogen peroxide and iodosylbenzene with Salen-MnIII as the catalyst / Clementina M. M. Santos, Artur M. S. Silva, José A. S. Cavaleiro, Albert Lévai, Tamás Patonay
Dátum:	2007
Megjegyzések:	(E,E)-Cinnamylideneacetophenones 3a?j were epoxidized under mild conditions with Jacobsen's catalyst 4 and hydrogen peroxide or iodosylbenzene as oxidants. gamma,delta-Monoepoxides and a diastereomeric mixture of alpha,beta:gamma,delta-diepoxides were obtained in each case, and only the alpha,beta-monoepoxide of 4-nitrocinnamylideneacetophenone (3d) was isolated. The presence of a methyl group in the vinylic moiety of substrates 3i,j allowed the formation of two gamma,delta-monoepoxide diastereomers. The epoxidation of (E,E)-2'-hydroxycinnamylid eneacetophenones 3h,j led to the formation of the corresponding gamma,delta-monoepoxides as well as (E)-2,3-trans-3-hydroxy-2-styryl-4-chromanones, which originated from the in situ cyclisation of 2,3-epoxy-1-(2-hydroxyphenyl)-5-phenyl-4-penten-1-ones. The structures of all new compounds and the stereochemistry of the mono- and diepoxide diastereomers were established by NMR studies.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban cinnamylideneacetophenones epoxidation Jacobsen's catalyst hydrogen peroxide iodosylbenzene
Megjelenés:	European Journal of Organic Chemistry. - 17 (2007), p. 2877-2887. -
További szerzők:	Silva, Artur M. S. Cavaleiro, José A. S. Lévai Albert (1941-) (kémikus) Patonay Tamás (1951-2015) (vegyész)
Internet cím:	DOI elektronikus változat
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