Assessment and funding

Dupont, J.

doi:10.1590/s0103-50532007000700001

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Eur.J.2017, 23,7287-7296 www.chemeurj.org role in balancing/stabilizing the negatively charged monomeric peroxotantalate anion. Furthermore, the presence of the "nano-inhomogeneity" in the ionic liquid could allow substrate molecules to reside in less polar regions and ionic speciest o undergo faster diffusion, [35] which might facilitatet he accessibility of organic substrates to the active sites on anionsa nd thus enhancet he reaction rate. In the present catalytic system, there is not ad irect coordination interaction between the substrate molecules and the Ta site and the catalytic reactionp roceeded through the hydrogen-bonding interactionm echanism, where the peroxide species around the Ta site can be transformed reversibly.This implied that the structure of the catalytically activeanions can be regenerated easily.…”

Section: Reactionm Echanismmentioning

confidence: 99%

Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

Chen

Kong

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

The efficient and environmentally benign epoxidation of allylic alcohols has been attained by using new kinds of monomeric peroxotantalate anion-functionalized ionic liquids (ILs=[P ] [Ta(O) (η-O )], P =quaternary phosphonium cation, n=4, 8, and 14), which have been developed and their structures determined accordingly. This work revealed the parent anions of the ILs underwent structural transformation in the presence of H O . The formed active species exhibited excellent catalytic activity, with a turnover frequency for [P ] [Ta(O) (η-O )] of up to 285 h , and satisfactory recyclability in the epoxidation of various allylic alcohols under very mild conditions by using only one equivalent of hydrogen peroxide as an oxidant. NMR studies showed the reaction was facilitated through a hydrogen-bonding mechanism, in which the peroxo group (O-O) of the peroxotantalate anion served as the hydrogen-bond acceptor and hydroxyl group in the allylic alcohols served as the hydrogen-bond donor. This work demonstrates that simple monomeric peroxotantalates can catalyze epoxidation of allylic alcohols efficiently.

show abstract

Section: Reactionm Echanismmentioning

confidence: 99%

Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

Chen

Kong

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…Even though ILs are not considered to be distilled because of their low volatility, Earle et al [8] showed that many ILs, especially bistriflamide ILs, can be distilled at 200-300°C at low pressure without decomposition. Dupont et al [9] showed that the solvent properties of ILs are mainly determined by the ability of the salt to act as a hydrogen bond donor, acceptor, and the degree of localization of the charges on the anions. For example, imidazolium-based ILs are highly ordered hydrogenbonded solvents, and they have strong effects on chemical reactions and processes.…”

Section: Solvent Property Of Ionic Liquidsmentioning

confidence: 99%

Microwave‐Assisted Organic Synthesis in Ionic Liquids

Pathak

Ameta

et al. 2015

Journal of Heterocyclic Chem

View full text Add to dashboard Cite

Revolution in organic compound synthesis has been promoted by microwave‐assisted organic syntheses (MAOS) by which small molecules are built up into large polymers in a fraction of time. Ionic liquids (ILs), considered being a relatively recent magical chemical due to their unique properties, have a large variety of applications in all areas of the chemical industries. Nonvolatility and nonflammability are their common characteristics giving them an advantageous edge in various applications. This common advantage, when considered with the possibility of tuning the chemical and physical properties of ILs by changing anion–cation combination, is a great opportunity to obtain task‐specific ILs for a multitude of specific applications. In previous reviews on this subject, the focus of MAOS has been on the process of MAOS reactions rather than the importance given to the related applications. This review focuses on properties of ILs and their use in organic synthesis of heterocyclic compounds under microwave exposure. In this review, a general description of ILs and historical background are given; basic properties of ILs such as solvent properties are discussed; structure of ILs, cation, anion types, and synthesis methods in the related literature and synthesis of different heterocyclic compounds in ILs are briefly summarized.

show abstract

“…Apesar da ampla discussão teórica acerca da avaliação, existe consenso sobre a sua importância, tanto para os dirigentes, como para os alunos, para o poder público e para a sociedade (Dupont, 2007). Em termos estratégicos, a avaliação poderia fornecer informações fundamentais para uma adequação do posicionamento competitivo da instituição.…”

Section: Análise Do Casounclassified

Casos para Ensino: Qualidade e Estratégia no Ensino Superior: O Caso da UniItalo

Duarte¹,

Paixão²

2014

TAC

View full text Add to dashboard Cite

Assessment and funding

Cited by 3 publications

References 0 publications

Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

Microwave‐Assisted Organic Synthesis in Ionic Liquids

Casos para Ensino: Qualidade e Estratégia no Ensino Superior: O Caso da UniItalo

Contact Info

Product

Resources

About