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Master's Dissertation
DOI
https://doi.org/10.11606/D.46.2008.tde-23092008-111520
Document
Author
Full name
Alexsandra Cristina Scalfo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Longo Junior, Luiz Sidney (President)
Coelho, Fernando Antonio Santos
Gruber, Jonas
Title in Portuguese
Estudo das condições reacionais da clivagem oxidativa de β-hidróxi-ésteres promovida por tetróxido de rutênio
Keywords in Portuguese
Clivagem oxidativa
Lactonas de anel médio
Oxidação
Reações orgânicas
Sintese orgânica
Tetróxido de rutênio
Abstract in Portuguese
Esta dissertação descreve os resultados obtidos no estudo da clivagem oxidativa de beta-hidróxi-éteres bicíclicos promovida por RuO4 catalítico visando à obtenção de ceto-lactonas de anel médio (9 e 10 membros). Um dos objetivos deste trabalho foi verificar o uso de solventes não clorados, uma vez que as condições clássicas para reações com RuO4 envolvem o uso de CCl4. Foram utilizados dois sistemas solventes: um homogêneo composto por MeCN e H2O (1:1) e um sistema bifásico composto por AcOEt/MeCN/H2O (2:2:3). Ambos os sistemas solventes mostraram-se viáveis para estas reações, levando a obtenção de ceto-lactonas de 9 e 10 membros em rendimentos moderados, mas inferiores aos rendimentos obtidos quando empregada a mistura CCl4/MeCN/H2O (2:2:3). Além disso, foi estudado o uso de Oxone como co-oxidante nas reações de clivagem oxidativa promovidas por RuO4, em substituição ao NaIO4 amplamente empregado nestas reações de oxidação. Contudo, o uso de Oxone levou a resultados insatisfatórios em comparação com aqueles obtidos com NaIO4.
Title in English
Study of reacional conditions of oxidative cleavage of beta-hydroxyethers promoted by ruthenium tetroxide
Keywords in English
Medium ring lactones
Organic reactions
Organic synthesis
Oxidation
Oxidative cleavage
Ruthenium tetroxide
Abstract in English
This dissertation presents the results obtained during the study of oxidative cleavage of bicyclic beta-hydroxyethers promoted by catalytic RuO4 aiming at obtention of medium ring keto-lactones (9 and 10 members). One of the aims of this work was to verify the use of non chlorinated solvents since the classic conditions for the RuO4 reactions involve the use of CCl4. Two solvents systems were used: a homogeneous one composed of MeCN and H2O (1:1) and a biphasic one composed by AcOEt/MeCN/H2O (2:2:3). Both solvents systems were useful in these reactions, leading to 9 and 10 membered keto-lactones in moderate yields. However, the yields were lower than those observed when the mixture CCl4/MeCN/H2O (2:2:3) was employed. Moreover, the use of Oxone as co-oxidant in the reactions of oxidative cleavage promoted by RuO4 was investigated in replacement of NaIO4, widely employed in these oxidation reactions. However, the use of Oxone led to unsatisfactory results in comparison with those obtained with NaIO4.
 
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Publishing Date
2008-10-07
 
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