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  1. Article ; Online: The Synthesis and Reactivity of Naphthoquinonynes.

    de Carvalho, Renato L / Wood, James M / Almeida, Renata G / Berry, Neil G / da Silva Júnior, Eufrânio N / Bower, John F

    Angewandte Chemie (International ed. in English)

    2024  Volume 63, Issue 18, Page(s) e202400188

    Abstract: The first systematic exploration of the synthesis and reactivity of naphthoquinonynes is described. Routes to two regioisomeric Kobayashi-type naphthoquinonyne precursors have been developed, and the reactivity of the ensuing 6,7- and 5,6-aryne ... ...

    Abstract The first systematic exploration of the synthesis and reactivity of naphthoquinonynes is described. Routes to two regioisomeric Kobayashi-type naphthoquinonyne precursors have been developed, and the reactivity of the ensuing 6,7- and 5,6-aryne intermediates has been investigated. Remarkably, these studies have revealed that a broad range of cycloadditions, nucleophile additions and difunctionalizations can be achieved while maintaining the integrity of the highly sensitive quinone unit. The methodologies offer a powerful diversity oriented approach to C6 and C7 functionalized naphthoquinones, which are typically challenging to access. From a reactivity viewpoint, the study is significant because it demonstrates that aryne-based functionalizations can be utilized strategically in the presence of highly reactive and directly competing functionality.
    Language English
    Publishing date 2024-03-25
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202400188
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  2. Article ; Online: Special issue: The Brazilian Meeting on Organic Synthesis.

    de Fátima, Ângelo / da Silva Júnior, Eufrânio N

    Chemical record (New York, N.Y.)

    2021  Volume 21, Issue 10, Page(s) 2602–2603

    Abstract: The 18th Brazilian Meeting on Organic Synthesis (18th BMOS) was planned to be held in Tiradentes, Brazil from October 2020. Due to the pandemic caused by the new coronavirus, the event was initially postponed until 2021 and will finally take place in ... ...

    Abstract The 18th Brazilian Meeting on Organic Synthesis (18th BMOS) was planned to be held in Tiradentes, Brazil from October 2020. Due to the pandemic caused by the new coronavirus, the event was initially postponed until 2021 and will finally take place in late 2022. This Special Collection of The Chemical Record is organized together with Guest Editors Ângelo de Fátima and Eufrânio N. da Silva Júnior from Federal University of Minas Gerais and features contributions by present and previous participants of the conferene in the field of Organic Synthesis.
    Language English
    Publishing date 2021-10-11
    Publishing country United States
    Document type Editorial
    ZDB-ID 2044646-9
    ISSN 1528-0691 ; 1527-8999
    ISSN (online) 1528-0691
    ISSN 1527-8999
    DOI 10.1002/tcr.202100247
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  3. Article ; Online: Multi-conformational Luminescence and Phosphorescence of Few Phenazine 1,2,3-triazole Molecules.

    Pinto, Pablo B / da Cruz, Kimberly C T / da Silva Júnior, Eufrânio N / Cury, Luiz A

    Journal of fluorescence

    2022  Volume 32, Issue 4, Page(s) 1299–1308

    Abstract: Dropcast films produced from blends solutions of phenazine 1,2,3-triazole molecules in very low concentrations in a 1,3-Bis (N-carbazolyl) benzene (mCP) matrix were investigated at room tem-perature. The mCP acts as an optically inert matrix, having no ... ...

    Abstract Dropcast films produced from blends solutions of phenazine 1,2,3-triazole molecules in very low concentrations in a 1,3-Bis (N-carbazolyl) benzene (mCP) matrix were investigated at room tem-perature. The mCP acts as an optically inert matrix, having no influence on the emission properties of the guest molecules. Its conductive properties ensure the blend films as completely organic active layers. The fluorescent and phosphorescent emissions of the guest molecules in blue, green, red and also in white are relatively intense, without the need to mix different organic materials. The excitation of the system occurs directly by the incident laser beam on the films. The steady-state spectroscopy for the blue monomer and green dimer singlet fluorescence emissions were investigated. The analysis of their temporal decays was done using a different approach based on the Exponentially Modified Gaussian function. The phosphorescent emissions of the triplet steady-states, in the orange or in the red wavelength regions, were observed to be correlated, respectively, to the formation of guest monomers or to the guest dimers singlet states.
    Language English
    Publishing date 2022-04-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2016892-5
    ISSN 1573-4994 ; 1053-0509
    ISSN (online) 1573-4994
    ISSN 1053-0509
    DOI 10.1007/s10895-022-02939-w
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  4. Article ; Online: Solvent-free hydroboration of alkenes and alkynes catalyzed by rhodium-ruthenium nanoparticles on carbon nanotubes.

    Nunes, Mateus P / Jawale, Dhanaji V / Delolo, Fábio G / Araujo, Maria H / Gravel, Edmond / Doris, Eric / da Silva Júnior, Eufrânio N

    Chemical communications (Cambridge, England)

    2023  Volume 59, Issue 19, Page(s) 2763–2766

    Abstract: A heterogeneous catalyst consisting of bimetallic rhodium-ruthenium particles immobilized on carbon nanotubes was used in the hydroboration reaction and proved highly effective for a variety of alkenes and alkynes. The reactions were carried out with low ...

    Abstract A heterogeneous catalyst consisting of bimetallic rhodium-ruthenium particles immobilized on carbon nanotubes was used in the hydroboration reaction and proved highly effective for a variety of alkenes and alkynes. The reactions were carried out with low catalytic loadings (0.04 mol%), under solvent-free conditions, and at room temperature. In addition, to demonstrate its recyclability, the catalyst was recovered by a simple centrifugation process and reused over 5 consecutive cycles without losing any activity.
    Language English
    Publishing date 2023-03-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d2cc06864h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The crucial role of silver(I)-salts as additives in C-H activation reactions: overall analysis of their versatility and applicability.

    de Carvalho, Renato L / Diogo, Emilay B T / Homölle, Simon L / Dana, Suman / da Silva Júnior, Eufrânio N / Ackermann, Lutz

    Chemical Society reviews

    2023  Volume 52, Issue 18, Page(s) 6359–6378

    Abstract: Transition-metal catalyzed C-H activation reactions have been proven to be useful methodologies for the assembly of synthetically meaningful molecules. This approach bears intrinsic peculiarities that are important to be studied and comprehended in order ...

    Abstract Transition-metal catalyzed C-H activation reactions have been proven to be useful methodologies for the assembly of synthetically meaningful molecules. This approach bears intrinsic peculiarities that are important to be studied and comprehended in order to achieve its best performance. One example is the use of additives for the
    Language English
    Publishing date 2023-09-18
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/d3cs00328k
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  6. Article ; Online: Bypassing Ammonia: From N

    Weber, Marco / Kupfer, Thomas / Arrowsmith, Merle / Dewhurst, Rian D / Rang, Maximilian / Ritschel, Benedikt / Titlbach, Sven / Ernst, Martin / Rodrigues, Marieli O / da Silva Júnior, Eufrânio N / Braunschweig, Holger

    Angewandte Chemie (International ed. in English)

    2024  Volume 63, Issue 21, Page(s) e202402777

    Abstract: Diboradiazene compounds, derived in one step from the boron-mediated reduction of dinitrogen ( ... ...

    Abstract Diboradiazene compounds, derived in one step from the boron-mediated reduction of dinitrogen (N
    Language English
    Publishing date 2024-04-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202402777
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  7. Article: Synthesis of β-triazolylenones via metal-free desulfonylative alkylation of

    Pati, Soumyaranjan / Almeida, Renata G / da Silva Júnior, Eufrânio N / Namboothiri, Irishi N N

    Beilstein journal of organic chemistry

    2021  Volume 17, Page(s) 762–770

    Abstract: Desulfonylative alkylation ... ...

    Abstract Desulfonylative alkylation of
    Language English
    Publishing date 2021-03-31
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2192461-2
    ISSN 1860-5397
    ISSN 1860-5397
    DOI 10.3762/bjoc.17.66
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  8. Article ; Online: The Different Facets of Metal-Catalyzed C-H Functionalization Involving Quinone Compounds.

    Wood, James M / de Carvalho, Renato L / da Silva Júnior, Eufrânio N

    Chemical record (New York, N.Y.)

    2021  Volume 21, Issue 10, Page(s) 2604–2637

    Abstract: Metal-catalysed C-H functionalization has emerged as a powerful platform for the derivatization of quinones, a class of compounds with wide-ranging applications. This review organises and discusses the evolution of this chemistry from early Fujiwara- ... ...

    Abstract Metal-catalysed C-H functionalization has emerged as a powerful platform for the derivatization of quinones, a class of compounds with wide-ranging applications. This review organises and discusses the evolution of this chemistry from early Fujiwara-Moritani reactions, through to modern directing-group assisted C-H functionalization processes, including C-H functionalization reactions directed by the quinone ring itself. Mechanistic details of these reactions are provided to afford insight into how the unique reactivity of quinoidal compounds has been leveraged in each example.
    Language English
    Publishing date 2021-01-08
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2044646-9
    ISSN 1528-0691 ; 1527-8999
    ISSN (online) 1528-0691
    ISSN 1527-8999
    DOI 10.1002/tcr.202000163
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  9. Article ; Online: Raman spectra-based structural classification analysis of quinoidal and derived molecular systems.

    Pena, Arthur P / Almeida, Renata G / Campos, João Luiz / Dos Santos, Hélio F / da Silva Júnior, Eufrânio N / Jorio, Ado

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 2, Page(s) 1183–1190

    Abstract: This work reports a classification analysis method based on the vibrational Raman spectra of 38 quinones and related structures, spectrally ordering and classifying the compounds. The molecular systems are relevant for chemical and biological processes, ... ...

    Abstract This work reports a classification analysis method based on the vibrational Raman spectra of 38 quinones and related structures, spectrally ordering and classifying the compounds. The molecular systems are relevant for chemical and biological processes, with applications in pharmacology, toxicology and medicine. The classification strategy uses a combination of principal component analysis with K-means clustering methods. Both theoretical simulations and experimental data are analysed, thus establishing their spectral characteristics, as related to their chemical structures and properties. The protocol introduced here should be broadly applicable in other molecular and solid state systems.
    Language English
    Publishing date 2022-01-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp04261k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Rh-Catalyzed [2 + 2 + 2] Cycloadditions with Benzoquinones: De Novo Access to Naphthoquinones for Lignan and Type II Polyketide Synthesis.

    Wood, James M / da Silva Júnior, Eufrânio N / Bower, John F

    Organic letters

    2019  Volume 22, Issue 1, Page(s) 265–269

    Abstract: The first examples of Rh-catalyzed [2 + 2 + 2] cycloadditions between diynes and benzoquinones are described. The method enables de novo and step-economical access to challenging naphthoquinones that are of relevance to lignan and type II polyketide ... ...

    Abstract The first examples of Rh-catalyzed [2 + 2 + 2] cycloadditions between diynes and benzoquinones are described. The method enables de novo and step-economical access to challenging naphthoquinones that are of relevance to lignan and type II polyketide synthesis. The value of the chemistry is demonstrated by a short total synthesis of justicidone.
    Language English
    Publishing date 2019-12-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.9b04266
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