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Dissertations / Theses on the topic 'Benzoquinones'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Vaysse, Lucile. "Synthese de benzoquinones et de naphtoquinones à activité cutanée potentielle." Université Louis Pasteur (Strasbourg) (1971-2008), 1990. http://www.theses.fr/1990STR13206.

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2

Ahmad, F. B. H. "Synthesis and reactions of benzoyl-1,4-benzoquinones : an approach to anthracyclinones." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376238.

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3

Berger, John Michael. "Isolation, Characterization, and Synthesis of Bioactive Natural Products from Rainforest Flora." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28086.

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As part of our ongoing investigations for anticancer drugs from rainforestflora, five plant extracts were determined to contain interesting bioactivity. These extracts were subjected to various separation techniques, affording a number of bioactive compounds that were then characterized by spectral and degradative methods. A methanol extract of Cestrum latifolium Lam. yielded the known compound parissaponin Pb. Hydrolysis afforded its aglycone, the known spirostanol diosgenin. GCMS analysis characterized the derivatized, hydrolyzed sugars. Previous investigations of Albizia subdimidiata pr
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4

Farard, Julien Duflos Muriel Logé Cédric. "Conception rationnelle, synthèse et évaluation de dérivés hétérocycliques oxygénés à potentialité antitumorale." [S.l.] : [s.n.], 2008. http://castore.univ-nantes.fr/castore/GetOAIRef?idDoc=52276.

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5

Dassonville, Alexandra. "Synthèse et évaluation pharmacologique de 3,6-diaryl-2,5-dihydroxy-1,4-benzoquinones à activité insulinomimétique." Nantes, 2003. http://archive.bu.univ-nantes.fr/pollux/show.action?id=90b76ad2-9f9a-4712-8e65-3490fc45bb5d.

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La déméthylasterriquinone B1 est une molécule naturelle, non peptidique, récemment découverte, après screening, pour ses propriétés insulinomimétiques. C'est dans ce cadre que nous avons développé une stratégie de synthèse pour la préparation de 3,6-diaryl-2,5-dihydroxy-1,4-benzoquinones, analogues de ce composé. Ainsi, l'accès à ces benzoquinones peut-être envisagé à partir de 3-aryl-1-hydroxypropan-2-ones via des 4-aryl-6-arylméthylidène-3-hydroxypyrane-2,5-diones, produits provenant de la condensation de 4-aryl-3-hydroxypyrane-2,5-diones et de dérivés aromatiques formylés. Aussi, de nombreu
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6

Dassonville, Alexandra Le Baut Guillaume. "Synthèse et évaluation pharmacologique de 3,6-diaryl-2,5-dihydroxy-1,4-benzoquinones à activité insulinomimétique." [S.l.] : [s.n.], 2003. http://theses.univ-nantes.fr/thesemed/DOCdassonville.pdf.

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7

SUFI, BIANCA da S. "Utilização de cocultura de melanócitos e queratinócitos para avaliação da ação do líquido da castanha de caju (LCC) na pigmentação epidérmica." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10197.

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Made available in DSpace on 2014-10-09T12:35:54Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:26Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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8

Farard, Julien. "Conception rationnelle, synthèse et évaluation de dérivés hétérocycliques oxygénés à potentialité antitumorale." Nantes, 2008. https://archive.bu.univ-nantes.fr/pollux/show/show?id=f40d012d-692b-402b-99de-c93d12be5595.

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Malgré la découverte de nouvelles molécules antitumorales et l'application de nouveaux traitements, le cancer reste une des principales causes de décès dans les pays développés. Des travaux antérieurs réalisés au laboratoire ont montré que des composés à structure 1,4-benzoquinone possédaient des activités sur la protéine anti-apoptotique Bcl-XL et sur la protéine tyrosine kinase Src, toutes deux impliquées dans des pathologies cancéreuses. Dans le prolongement de ces travaux, des pharmacomodulations ont été réalisées autour du noyau benzoquinone, sans permettre l'amélioration des activités ex
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9

Béarnais-barbry, Stéphane. "Etude de photoréactivité de la méthoxy-p-quinone et de phényl-p-benzoquinones en solution." Bordeaux 1, 2001. http://www.theses.fr/2001BOR12394.

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L'étude de la photoréactivité du couple méthoxy-p-quinone/méthoxyhydroquinone en solution a permis d'appréhender son importance dans la photodégradation des pâtes à papier à haut rendement. Le mécanisme de la photocyclisation de diverses phényl-p-benzoquinones et d'un analogue, la 4,4'-diméthoxyhydroquinone, a été déterminé par irradiation continue et spectroscopie résolue dans le temps.
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10

Gan, Daqing. "Aqueous photochemistry of 1,4-benzoquinones and their possible role in the photochemistry of natural organic matter." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2180.

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Thesis (Ph. D.)--University of Maryland, College Park, 2005.<br>Thesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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11

BEARNAIS-BARBRY, Stéphane. "Etude de la photoréactivité de la méthoxy-p-quinone et de phényl-p-benzoquinones en solution." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2001. http://tel.archives-ouvertes.fr/tel-00006202.

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L'étude de la photoréactivité du couple méthoxy-p-quinone/méthoxyhydroquinone en solution a permis d'appréhender son importance dans la photodégradation des pâtes à papier à haut rendement. Le mécanisme de la photocyclisation de phényl-p-benzoquinones et d'un analogue, la 4,4'-diméthoxybiphényle-2,5,2',5'-diquinone issue du couplage entre la méthoxy-p-quinone et la méthoxyhydroquinone, a été déterminée par irradiation continue et spectroscopie résolue dans le temps.
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12

Lardic, Morgane. "Synthèse et évaluation pharmacologique de 3,6-diaryl-2,5-dihydroxy-1,4-benzoquinones et de 2 (ou 3)-arylméthylènenaphtofuran-3 (ou 2)-ones modulateurs de protéines kinases." Nantes, 2004. http://www.theses.fr/2004NANT16VS.

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Ce mémoire présente la synthèse de deux familles de composés et leur évaluation pharmacologique sur l'activation ou l'inhibition de protéines kinases, cibles thérapeutiques potentielles dans de nombreuses pathologies comme le diabète ou le cancer. La première partie décrit la synthèse de 3,6-diaryl-2,5-dihydroxy-1,4-benzoquinones, analogues de la déméthylasterriquinione. Deux stratégies de synthèse ont été exploitées : la première via des 4-aryl-6-arylméthylène-3-hydroxypyrane-2,5-diones ; la seconde approche s'appuie sur des réactions d'arylation sélectives d'un noyau benzoquinone. Les benzoq
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13

Moussa, Jamal. "Architectures métallo-supramoléculaires photoluminescentes à ligands organométalliques quinoïdes et thioquinonoïdes : une nouvelle classe de réseaux de coordination." Paris 6, 2007. http://www.theses.fr/2007PA066481.

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L’originalité de ce travail réside dans l’utilisation de complexes organométalliques comme ligands assembleurs, les organométalloligands. Ces organométalloligands peuvent coordonner des briques inorganiques de métaux de transition via les oxygènes et les soufres pour construire de nouvelles architectures métallo-supramoléculaires. A cet égard, nous avons isolé pour la première fois l’o- et la p-dithiobenzoquinone, deux intermédiaires très instables, sous forme de complexes d’Ir(I). L’utilisation de briques inorganiques d’Ag(I), Cu(I) et Cu(II) a permis d’obtenir des polymères de coordination.
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14

Zhang, Yun Zhi. "C-Glycosyl-Hydro-, and -Benzoquinones substitued with amino, halogeno, or formyl groups : synthesis and preliminary biological evaluation." Lyon 1, 2007. http://www.theses.fr/2007LYO10207.

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Les C-Glycosides sont des glycomimétiques résistants à l'hydrolyse et utiles pour l'étude des glyco-enzymes. Le couplage de Friedel-Crafts entre le 1,4-diméthoxybenzène et des sucres peracétylés (D-gluco, D-galacto) en présence d'acides de Lewis conduit à des motifs C-glycosylés convertis en benzoquinones par oxydation, puis en hydroquinones par réduction, donnant des motifs C-glycosylés nouveaux. Pour élargir l'étude de l'inhibition de la clycogène phosphorylase (GP), la synthèse d'hydroquinones et benzoquinones halogénées, par substitution électrophile aromatique ou addition sur le motif ben
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15

Campos, Ivan Persio de Arruda. "Estudos sobre a síntese e a fotociclização de adutos de Diels-Alder entre ciclopentadieno e alguns benzoquinonas 2-mono-substituídas." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-15062015-122641/.

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A presente tese apresenta: I - Uma revislo bibliográfica sobre os adutos de Diels-Alder entre benzoquinonas 2-mono-substituídas ou benzoquinona não-substituída e ciclopentadieno; II - Uma visão mecanística, de literatura, sobre as reações de ciclo-adição; III - A síntese, por nós efetuada, de uma série de adutos de Diels-Alder entre ciclopentadieno e benzoquinonas 2-mono-substituídas por cloro, bromo, ou ainda, substituintes contendo nitrogênio, oxigênio, enxofre ou selênio; IV - O estudo que empreendemos sobre a fotociclização dos adutos acima mencionados. Na obtenção dos adutos, foram empreg
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16

Ben, Rabha Fatma Mohammed. "Mechanistic studies on aziridinyl-benzoquinones and CCNU [1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea] in cultured tumour cells." Thesis, University of Salford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490259.

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17

Guo, Wenchang. "The role of NQO1 in the metabolism of benzoquinone ansamycin HSP90 inhibitors and development of Novel HSP90 inhibitors as anticancer agents /." Connect to full text via ProQuest. Limited to UCD Anschutz Medical Campus, 2007.

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Thesis (Ph.D. in Toxicology) -- University of Colorado Denver, 2007.<br>Typescript. Includes bibliographical references (leaves 158-180). Free to UCD affiliates. Online version available via ProQuest Digital Dissertations;
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18

Duval, Romain. "Benzène et leucémies : étude de l'effet des métabolites réactifs du benzène sur l'histone acétyltransférase CBP." Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC091.

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Le benzène (BZ) est un polluant environnemental classé comme cancérogène avéré pour l'Homme et plus particulièrement leucémogène. Son pouvoir leucémogène repose sur sa métabolisation dans la moelle osseuse en métabolites réactifs. La benzoquinone (BQ) est le métabolite toxique principal du BZ et son hématotoxité repose principalement sur des réactions d'adduction des macromolécules et par l'induction de stress oxydatifs. Les mécanismes moléculaires sous-jacents sont ne pas entièrement élucidés. CBP est une enzyme épigénétique qui joue un rôle crucial dans l'hématopoïèse. La perte de son activi
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19

Vitta, Claudio Di. "Adutos de diels-alder entre 2,3-dialquiltio e diariltio - benzoquinonas e ciclopentadieno." Universidade de São Paulo, 1985. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-03092012-092750/.

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Esta tese apresenta as reações entre o aduto de Diels-Alder 2,3-diclorobenzoquinona-ciclopentadieno e alguns nucleófilos, não descritas na literatura, conforme pode ser verificado pela revisão bibliográfica apresentada no primeiro capítulo. Assim, dezenove novos adutos dialquiltio- e diariltio-substituídos, bem como o correspondente difenilseleno derivado, foram sintetizados e caracterizados. As reações com alguns nucleófilos de oxigênio e nitrogênio falharam, fornecendo o aduto diclorado aromatizado. O aduto dimetiltio-substituído aromatizado foi obtido pela reação do aduto diclorado com exce
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20

Valega, Mackenzie Fidel Orlando. "Estrutura eletrônica de precursores de alomelaninas." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277613.

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Orientador: Douglas Soares Galvão<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-12T10:36:43Z (GMT). No. of bitstreams: 1 ValegaMackenzie_FidelOrlando_M.pdf: 2711520 bytes, checksum: 6eef4b8eb7c976af1efdb0f0bb711dd0 (MD5) Previous issue date: 2008<br>Resumo: Nesta dissertação foram estudados, utilizando um enfoque semiempírico e de primeiros princípios, a estrutura e as propriedades eletrônicas de alguns precursores de alomelaninas. As alomelaninas fazem parte de uma classe de pigmentos escuros presentes
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21

Carvalho, Paulo Sergio de 1966. "Ciclizações oxidativas de 3-hidróxi-benzenopropanóis promovidas por reagentes de iodo(III) hipervalente." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250616.

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Orientador: Jose Augusto Rosário Rodrigues<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química<br>Made available in DSpace on 2018-08-24T08:17:01Z (GMT). No. of bitstreams: 1 Carvalho_PauloSergiode_D.pdf: 14146737 bytes, checksum: cce704fa63bb067ebc25618dac57ceb6 (MD5) Previous issue date: 2013<br>Resumo: Este trabalho descreve uma metodologia para a síntese de 1,2- e 1,4-benzoquinona-monocetais através da oxidação de fenóis contendo uma cadeia hidróxi-alquílica lateral promovida por reagentes de iodo(III) hipervalente. 3-Hidróxi-?-metil-benzenopropanol e três deriv
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22

Aguiar, Allan Carlos dos Santos. "Estudo eletroquímico do contaminante emergente 2,6-dicloro- 1,4-benzoquinona em solução aquosa e avaliação da sua interação com DNA." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1752.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-07-19T19:36:29Z No. of bitstreams: 1 AllanAguiar.pdf: 1217972 bytes, checksum: 8d901c39af9d9a55e5fe7dbfb88a0ea9 (MD5)<br>Made available in DSpace on 2017-07-19T19:36:29Z (GMT). No. of bitstreams: 1 AllanAguiar.pdf: 1217972 bytes, checksum: 8d901c39af9d9a55e5fe7dbfb88a0ea9 (MD5) Previous issue date: 2017-05-30<br>The 2,6-dichloro-1,4-benzoquinone (DCBQ), a subproduct of the water disinfection process, is a highly reactive molecule and has a redox cycle with its semiquinone radicals that lead to the formation of reactive oxygen speci
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23

Zaia, Dimas Augusto Morozin. "Uso da p-benzoquinona para determinação de proteínas totais em diversas matrizes e amino grupos livres em síntese de peptídeos em fase sólida." Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-25112014-164611/.

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O presente trabalho apresenta metodologias utilizando a p-benzoquinona (PBQ) para a determinação de proteínas totais em diversas matrizes. As metodologias propostas foram comparadas com os métodos recomendados ou os mais utilizados, conforme o caso. O método aqui proposto, para determinação de proteínas totais em plasma sangüíneo, foi comparado com o método de biureto, mostrando-se adequado e com sensibilidade dez vezes maior que a do biureto. Para a determinação de proteínas totais em diversos tecidos de rato, o método proposto foi comparado com os métodos de Hartree e FFDW, e apresentou resu
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24

Santos, Amauri da Paixão. "A ação de nucleófilos sobre o aduto cloranil-ciclopentadieno." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-02072008-130027/.

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Efetuaram-se as reações de nucleófilos de oxigênio (MeONa, EtONa, PhONa e t-BuOK) com o aduto de Diels-Alder cloranil-ciclopentadieno, com o objetivo de se obterem os correspondentes adutos poli-substituídos. Nas reações com MeONa e EtONa foram empregadas tanto quantidades estequiométricas como excesso destes alcóxidos. Nestes últimos casos, foram obtidos dois produtos. Um destes, quando se empregou MeONa, apresentou a mesma estrutura que o aduto cis,endo-2,5-dicloro- 3,6-dimetóxi-p-benzoquinona-ciclopentadieno. O outro produto (B), isolado na forma de óleo, apresentou dados de RMN e de
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25

Costa, Julio Cesar Ruivo. "Estados aniônicos da para-Benzoquinona." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-10112016-140105/.

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Este trabalho apresenta o primeiro estudo dos estados aniônicos de baixa energia da para-Benzoquinona (p-BQ) por meio de cálculos de espalhamento elástico de elétrons pela molécula neutra. Foi utilizado o método multicanal de Schwinger implementado com pseudopotenciais de Bachelet, Hamann e Schlüter, na aproximação de núcleos fixos, e nas aproximações estático-troca e estático-troca mais polarização. As seções de choque integrais foram calculadas em duas geometrias do alvo, otimizadas para o estado fundamental da molécula neutra e do ânion. Os estados aniônicos encontrados foram aracterizados
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26

Mohsen, Oftadeh, and Barati Bahman. "Theoretical study of 1 and 4 benzoquinone and difluoro derivatives of benzoquinone on zinc oxide nano particles by dft method." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20545.

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This study investigates some aspects of interaction between 1 and 4 benzoquinone (BQ) and fluoro derivatives of 1, 4-BQ on surface of zinc oxide nanopatricles theoretically with using density functional method (B3LYP) and 6-31G as basis set. The significant quantities include HOMO, LUMO, chemistry potential, hardness and dipole moment have been computed and compared. The highest gap energy and the most hardness can be referred to the 1, 4- difluoro benzoquinone compared with two another derivatives, 2,5- and 2,6- difluoro benzoquinone. This interaction showed that these groups stabilize the r
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Miranda, Roqueline Rodrigues Silva de. "Síntese e fitotoxicidade de novas p-benzoquinonas substituídas." Universidade Federal de Viçosa, 2003. http://www.locus.ufv.br/handle/123456789/8710.

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Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2016-10-03T17:03:27Z No. of bitstreams: 1 texto completo.pdf: 683009 bytes, checksum: 20390e69efc884e36da1964a74945dcf (MD5)<br>Made available in DSpace on 2016-10-03T17:03:27Z (GMT). No. of bitstreams: 1 texto completo.pdf: 683009 bytes, checksum: 20390e69efc884e36da1964a74945dcf (MD5) Previous issue date: 2003-02-28<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Objetivou-se neste trabalho sintetizar e avaliar a atividade herbicida de compostos análogos à sorgoleona, quinona encontrada em exsuda
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Mbiya, Wilbes. "Substituent Effects on Reactivity and Allergenicity of Benzoquinone." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1406.

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Benzoquinone (BQ) is an extremely potent electrophilic contact allergen that haptenates endogenous proteins through Michael addition (MA). It is also hypothesized that BQ may haptenate proteins via free radical formation. The objective of this study was to assess the inductive effects (activating and deactivating) of substituents on BQ reactivity and the mechanistic pathway of covalent binding to nucleophilic thiols. The BQ binding by Cys34 on human serum albumin was studied, and for reactivity studies, nitrobenzenethiol (NBT) was used as a surrogate for protein binding of the BQ and benzoquin
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29

Moreira, Maria Manuela Nunes de Castro. "Benzoquinonas existentes em espécies de Cyperus da flora portuguesa : contribuição para o seu conhecimento." Doctoral thesis, Porto : [Edição do Autor], 1990. http://hdl.handle.net/10216/64014.

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Moreira, Maria Manuela Nunes de Castro. "Benzoquinonas existentes em espécies de Cyperus da flora portuguesa : contribuição para o seu conhecimento." Tese, Porto : [Edição do Autor], 1990. http://catalogo.up.pt/F?func=find-b&local_base=UPB01&find_code=SYS&request=000105011.

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31

Gonçalves, Taís Maria de Nazareth. "Custos da defesa química em opiliões (Arachnida: Opiliones)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-15032016-144120/.

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As formas de defesa encontradas na natureza são incrivelmente diversas e envolvem estratégias que minimizam as chances de encontro com o predador ou as chances de escape diante de um ataque. A liberação de substâncias químicas é uma forma de defesa amplamente difundida entre artrópodes e vários estudos já demonstraram sua eficiência contra o ataque de predadores. Apesar de trazerem benefícios óbvios em termos de defesa, a produção de vários desses compostos químicos deve ser custosa para as presas. Esta tese teve como objetivo geral explorar os custos da produção de defesas químicas em um grup
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32

Filho, José Eduardo Pandini Cardoso. "Estudos de diastereosseletividade facial em reações de Diels-Alder de sulfinil benzoquinonas e em adições nucleofílicas a sulfinil cicloexanonas sulfaniladas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-19122008-114737/.

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Calcando-se na bem conhecida capacidade que os sulfóxidos apresentam em induzir a quiralidade em uma vasta gama de reações, foram preparadas as (±)-2-p-tolilsulfinil-3,6-dimetil- e a (S)-2-p-tolilsulfinil-3-metil-1,4-benzoquinonas e estudadas as suas reações de Diels-Alder com alguns 1,3-dienos. Bons resultados de quimio- e regiosseletividade foram obtidos no caso da primeira quinona com o trans-piperileno e com o 1-vinil-cicloexeno, mas a eliminação espontânea de ácido sulfênico gerou produtos que não puderam ser utilizados posteriormente. O grupo sulfinila, no caso da segunda quinona prepara
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33

Vieira, Ygor Willian. "A reação de Diels-Alder de p-Benzoquinonas em versão multicomponente." Universidade Federal de São Carlos, 2005. https://repositorio.ufscar.br/handle/ufscar/6621.

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Made available in DSpace on 2016-06-02T20:36:57Z (GMT). No. of bitstreams: 1 796.pdf: 1560242 bytes, checksum: 0ce7599e0b4f067631bd025f14b2400a (MD5) Previous issue date: 2005-08-24<br>Financiadora de Estudos e Projetos<br>A study of the multicomponent version of the Diels-Alder reaction of para-benzoquinones has been proposed, with the idea of uniting the versatility of the reaction with the simplicity of the methodology. The key step involves the condensation of &#945;,&#946;-unsaturated aldehydes (R2 = H, Me and i-Pr) with primary amides (R = Me and Ph) and subsequent [4+2] cycloaddition
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34

Bogle, Katherine Mary. "An organocatalytic oxidative coupling strategy for the synthesis of arylated quaternary stereocentres and its application in the total synthesis of powelline and buphanidrine." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/an-organocatalytic-oxidative-coupling-strategy-for-the-synthesis-of-arylated-quaternary-stereocentres-and-its-application-in-the-total-synthesis-of-powelline-and-buphanidrine(4038d899-f157-4ac5-904b-128553be92ff).html.

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The synthesis of compounds containing α-arylated quaternary stereogenic centres is a significant synthetic challenge. This thesis describes the development of an organocatalytic methodology for the direct construction of this motif through the Michael addition of carbon-centered pro-nucleophiles to highly reactive and unstable ortho-benzoquinones. Proof-of-principle for the base catalysed Michael addition to ortho-quinones was established with stable 1,2-naphthoquinone (Chapter 2), however typical orthobenzoquinones were found to be too unstable to use in this process. Accordingly an oxidative
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35

Donatoni, Maria Carolina. "A Reação de Diels - Alder de p-benzoquinonas sob efeito de microondas." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/6442.

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Made available in DSpace on 2016-06-02T20:36:21Z (GMT). No. of bitstreams: 1 2041.pdf: 7286853 bytes, checksum: 5d9880838eb2486c513e5c444b5de019 (MD5) Previous issue date: 2008-08-08<br>Financiadora de Estudos e Projetos<br>In this work it was done a study of the microwave effect on Diels - Alder reaction of the p-benzoquinones thymoquinone (A1), 2,5-dimethyl-p-benzoquinone (A2) and 2,6-dimethyl-pbenzoquinone (A3) with the dienes cyclopentadiene (BB1), 2,3-dimethyl-1,3- butadiene (B2B ), isoprene (BB3) and trans-pyperilene (B4B ) (Figure &#921;). These reactions were also held under conventi
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36

Finelli, Fernanda Gadini. "A reação de Diels-Alder entre p-Benzoquinonas 1,3-Pentadienos-1-Substituídos." Universidade Federal de São Carlos, 2004. https://repositorio.ufscar.br/handle/ufscar/6552.

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Made available in DSpace on 2016-06-02T20:36:44Z (GMT). No. of bitstreams: 1 DissFGF.pdf: 9650909 bytes, checksum: e08cf6dfae53cd623a5b128765a3fc86 (MD5) Previous issue date: 2004-07-23<br>Universidade Federal de Minas Gerais<br>In this dissertation, studies are described on the cycloaddition of 1-silyloxypentadiene- 1,3 and 1-acylamino-pentadiene-1,3 with alkylated para-benzoquinones. The first methodology involves cycloaddition reactions of dienes 51, 115 and 116, under catalysis and thermolysis conditions, with para-benzoquinones 37, 42 and 43.The second methodology involves the preparati
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37

Hilário, Carolina Correia. "Interação entre Tribolium castaneum (Herbst) e fungos produtores de micotoxinas." Master's thesis, ISA, 2020. http://hdl.handle.net/10400.5/21517.

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Mestrado em Engenharia Alimentar / Instituto Superior de Agronomia. Universidade de Lisboa<br>A contaminação de cereais e derivados por insetos e fungos é uma problemática atual pois estes organismos, através não só do consumo dos cereais, mas também a partir da contaminação por substâncias excretadas por fungos e insetos, podem causar avultados prejuízos quantitativos e qualitativos durante o armazenamento dos cereais e derivados. O Tribolium castaneum (Herbst) é considerado uma praga secundária de cereais e derivados armazenados. Os adultos excretam benzoquinonas, que conferem proteção
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38

Pietsch, Inga-Marlene. "Studies towards the total synthesis of the ansamycin benzoquinone antibiotic herbimycin A." Thesis, University of Sussex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496799.

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39

Lavaud, Lucien. "Des diamino-benzoquinone-diimines aux azacalixphyrines : développement de colorants émergents du proche infrarouge." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0404/document.

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Les colorants organiques du proche infrarouge présentent un intérêt majeur dans différent secteurs technologiques. Les travaux présentés dans cette thèse portent sur le développement de ce type de chromophores à partir d’unités quinones possédant une conjugaison électronique particulière : les 2,5-diamino-1,4-benzoquinone-diimines (DABQDI). De nouvelles DABQDI ont pu être synthétisées et leur utilisation comme ligand a notamment permis d’obtenir des complexes absorbant du domaine visible jusqu’à celui du proche infrarouge. Ces unités DABQDI ont également pu être incorporées au sein de macrocyc
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40

Lavaud, Lucien. "Des diamino-benzoquinone-diimines aux azacalixphyrines : développement de colorants émergents du proche infrarouge." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0404.

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Les colorants organiques du proche infrarouge présentent un intérêt majeur dans différent secteurs technologiques. Les travaux présentés dans cette thèse portent sur le développement de ce type de chromophores à partir d’unités quinones possédant une conjugaison électronique particulière : les 2,5-diamino-1,4-benzoquinone-diimines (DABQDI). De nouvelles DABQDI ont pu être synthétisées et leur utilisation comme ligand a notamment permis d’obtenir des complexes absorbant du domaine visible jusqu’à celui du proche infrarouge. Ces unités DABQDI ont également pu être incorporées au sein de macrocyc
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41

Nain, Pérez Amalyn. "Síntese de 2,5-bis-(alquilamino)-1,4-benzoquinonas e avaliação das atividades inseticida e fitotóxica." Universidade Federal de Viçosa, 2014. http://www.locus.ufv.br/handle/123456789/7621.

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Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2016-05-04T17:19:18Z No. of bitstreams: 1 texto completo.pdf: 3424866 bytes, checksum: d688d819f774636b526f8ed6fb78f454 (MD5)<br>Made available in DSpace on 2016-05-04T17:19:18Z (GMT). No. of bitstreams: 1 texto completo.pdf: 3424866 bytes, checksum: d688d819f774636b526f8ed6fb78f454 (MD5) Previous issue date: 2014-07-29<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>As quinonas constituem uma classe de compostos de produtos naturais e apresentam ampla gama de propriedades biológicas. Várias aminoq
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42

Barjesteh, Hengameh. "Studies of complexes derived from 5-acetylamino-1,2-benzoquinone 2-oxime and related ligands." Thesis, London Metropolitan University, 1991. http://repository.londonmet.ac.uk/3334/.

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5-Acatylamino-l,2-benzoquinone 2-oxine [5-AcqoH] results from the direct nitrosation of 3-acatylaminophenol together with its isomer 3-acetylamino-l,4-benzoquinone 4-oxine [3-AcqoH]. The quinone oximic structure of the former has been indicated by i.r. and n.m.r. studies. In the case of 3-AcqoH this type of structure has been established by X-ray crystallography. Following a brief review of quinone oxinic complexes, a study of the synthesis, properties and structure of Cu(II), Ni(II), Co(III), and Mn(III) complexes of 5-AcqoH is presented. The complexes Ni(5-Acqo)2.nH2O (n = 2-6), Cu(5-Acqo)2,
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43

Servilha, Bruno Moraes. "Químio-, régio- e estereosseletividades das reações de Diels-Alder de para-benzoquinonas: um estudo teórico." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/6598.

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Made available in DSpace on 2016-06-02T20:36:53Z (GMT). No. of bitstreams: 1 6231.pdf: 5609017 bytes, checksum: 03af95024b0b6c67c4e19ade0e886624 (MD5) Previous issue date: 2014-07-23<br>Financiadora de Estudos e Projetos<br>In this work, some computational theoretical studies on the reactivity of para-benzoquinones and their derivatives in Diels-Alder reactions were proposed These studies were done in order to compliment the corresponding experimental studies ongoing in our laboratory. The Diels-Alder reactions between carbomethoxy-parabenzoquinones 16, 17 e 19 and cyclopentadiene furnished
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44

Cantó, Vallverdú Mariona. "Síntesi de productes naturals a partir d'un monoacetal enantiopur de p-benzoquinona." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/3219.

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45

Chesneau, Bertrand. "Synthèse de systèmes donneur-accepteur associant le tétrathiafulvalène à la p-benzoquinone ou la 1,10-phénanthroline." Phd thesis, Université d'Angers, 2008. http://tel.archives-ouvertes.fr/tel-00435091.

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Les systèmes donneur-accepteur suscitent un intérêt croissant car l'interaction électronique entre les deux partenaires est un paramètre essentiel pour l'élaboration de nouveaux matériaux organiques fonctionnels. Ce travail est consacré à la synthèse d'assemblages moléculaires incorporant le donneur d'électron tétrathiafulvalène associé à l'accepteur d'électron p-benzoquinone ou 1,10-phénanthroline. L'introduction d'un espaceur conjugué entre les moitiés 1,3-dithiole du tétrathiafulvalène conduit à de nouveaux systèmes à grande extension spatiale portant à chaque extrémité le motif p-benzoquin
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46

Ekcan, Ismail. "Metal complexes of selected 5-alkylamino-1,2-benzoquinone-2-oximes and their applicability in solvent extraction." Thesis, London Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341731.

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47

Uliana, Marciana Pierina. "A regioquímica das reações de Diels-Alder de N-tosil para-benzoquinona iminas." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/6232.

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Made available in DSpace on 2016-06-02T20:34:35Z (GMT). No. of bitstreams: 1 4418.pdf: 6477704 bytes, checksum: 72f25d5bf40ac9df2022ceac5de9ac13 (MD5) Previous issue date: 2012-02-29<br>Universidade Federal de Minas Gerais<br>In this work it was done a comparative study on the reactivity of a variety of dienophiles including para-benzoquinones, their mono-oximes, their N-tosyl mono-oximes and their N-tosylimines on the Diels-Alder reactions with simple dienes. The synthesis of the dienophiles was performed through chemical modifications from the corresponding phenols as represented in Scheme
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48

Ngcobo, N. Mlondi. "Synthesis of prenylated benzoquinones." Thesis, 2010. http://hdl.handle.net/10413/640.

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The research presented in this study demonstrates the critical role that organic synthesis plays in natural product chemistry. The biological activity demonstrated by 2-methyl-6-(3-methyl-2- butenyl)benzo-1,4-quinone prompted an investigation into the synthesis of this compound. This natural product showed significant activity against Staphylococcus epidermidis. Therefore the aim of this study was to synthesise 2-methyl-6-(3-methyl-2-butenyl)benzo-1,4- quinone and structural analogues. The regioselective synthetic route formulated for the synthesis of 2-methyl-6-(3-methyl-2- butenyl)benzo-1,4-
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49

Hsieh, Ming-Fang, and 謝明芳. "The Reactions of Masked o-Benzoquinones." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/08804300571390351684.

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博士<br>國立清華大學<br>化學系<br>88<br>The studies on the reaction of masked o-benzoquinones (MOBs) 2 with enamines, pyrroles and indoles are described. This thesis consists of three parts: the first part is concerned with the cycloaddition reactions of MOBs with enamines. The second part deals with the cycloaddition reaction of MOBs with pyrroles. The last part describes the reactions of MOBs with indoles. In the first part, bicyclo[2.2.2]octenone derivatives 42-48 were obtained in the cycloaddition reactions of MOBs 2 and enamines. The results showed that these reactions are highly regi
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50

Chu, Chrong-Shyua, and 朱崇玄. "Synthetic Applications of Masked o-Benzoquinones." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/21417582665584500206.

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