https://repositorio.ufba.br/handle/ri/5999
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Santos, Edeilza Lopes dos | - |
dc.contributor.author | Gomes Jr, Walter Alves | - |
dc.contributor.author | Ribeiro, Núbia Moura | - |
dc.contributor.author | Andrade, Heloysa Martins Carvalho | - |
dc.creator | Santos, Edeilza Lopes dos | - |
dc.creator | Gomes Jr, Walter Alves | - |
dc.creator | Ribeiro, Núbia Moura | - |
dc.creator | Andrade, Heloysa Martins Carvalho | - |
dc.date.accessioned | 2012-05-30T18:40:23Z | - |
dc.date.issued | 2008 | - |
dc.identifier.issn | 1381-1169 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/5999 | - |
dc.description | Acesso restrito: Texto completo. p. 18-23 | pt_BR |
dc.description.abstract | The dioxolane ketals of isatin and 5-chloroisatin were prepared using an efficient and cleaner procedure than the usual synthetic routes. Keggin heteropolyacids, namely, heteropolyphosphotungstic acid (HPW), HPW/SiO2 and Cs2.2HPW, have proven to be useful catalysts, allowing to the fast, selective and solvent-less preparation of ketals, with high yields and 100% selectivity. The homogeneous HPW catalyst may be successfully heterogenized by partial exchange of H+ for Cs+ but some evidenceswere found of significant homogeneous contributions of leachedHPWwhen the silica supported catalysts (HPW/SiO2) was used in the ketalization reaction. The Cs2.2HPW (Cs2.2H0.8PW12O40) catalysts may be repeatedly used but a progressive activity losswas assigned to residual organic materials that could not be removed after several dichloromethane washings. | pt_BR |
dc.language.iso | en | pt_BR |
dc.source | http://dx.doi.org/10.1016/j.molcata.2008.08.011 | pt_BR |
dc.subject | Keggin heteropolycompounds | pt_BR |
dc.subject | Heteropolyphosphotungstic acid | pt_BR |
dc.subject | Isatin | pt_BR |
dc.subject | Ketalization | pt_BR |
dc.title | Ecofriendly ketalization of isatin using heteropolycompounds as catalysts | pt_BR |
dc.title.alternative | JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.identifier.number | v. 295, n. 1-2 | pt_BR |
dc.embargo.liftdate | 10000-01-01 | - |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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