Bibliografías temáticas / Encol S.A

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Literatura académica sobre el tema "Encol S.A"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 9 de febrero de 2022

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Artículos de revistas sobre el tema "Encol S.A"

1

Gueyrard, David. "Extension of the Modified Julia Olefination on Carboxylic Acid Derivatives: Scope and Applications". Synlett 29, n.º 01 (16 de octubre de 2017): 34–45. http://dx.doi.org/10.1055/s-0036-1590916.

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This account relates our work in the field of modified Julia olefination to extend this very useful olefination method to carboxylic acid derivatives. Since our preliminary results on lactones in 2005, the reaction has been extended to a large range of derivatives (lactams, imides and anhydrides) through an intra- or intermolecular process leading to a great variety of structures (enol ethers, enamides and exo enol esters). This article will also focus on the application of this methodology for the preparation of biologically interesting compounds and/or total syntheses of natural products such as C-disaccharide, bistramide A, jaspine B and maculalactone B.1 Introduction2 Modified Julia Olefination on Lactones2.1 Methylene Enol Ether Synthesis2.2 Substituted Enol Ether Synthesis2.3 Monofluorinated Enol Ether Synthesis2.4 Difluorinated Enol Ether Synthesis3 Applications3.1 Spiroketal Synthesis3.2 Spirocompound Synthesis3.3 Pseudodisaccharide Synthesis3.4 Total Synthesis of Jaspine B4 Modified Julia Olefination on Other Carboxylic Acid Derivatives4.1 Lactam Olefination and Spiroaminal Synthesis4.2 Bicyclic Enamide Synthesis by Intramolecular Modified Julia Olefination on Imides4.3 Modified Julia Olefination on Anhydrides5 Conclusion
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Zhang, Meixia, Qiao Zhou, Can Du, Yong Ding y Peng Song. "Detailed theoretical investigation on ESIPT process of pigment yellow 101". RSC Advances 6, n.º 64 (2016): 59389–94. http://dx.doi.org/10.1039/c6ra11140h.

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The ESIPT scheme amongenol–enol,enol–ketoandketo–keto: The equilibrium ESIPT process exists in the S1state. And following with the radiative transition, the reversed GSIPT can also occur in the S0state.
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Okano, Kentaro, Ryo Nakura, Kazuki Inoue y Atsunori Mori. "Practical Synthesis of Precursors of Cyclohexyne and 1,2-Cyclohexadiene". Synthesis 51, n.º 07 (11 de enero de 2019): 1561–64. http://dx.doi.org/10.1055/s-0037-1610356.

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This study investigated a practical method for regiocontrolled synthesis of precursors of strained cyclohexynes and 1,2-cyclohexadienes, which is a one-pot procedure consisting of a rearrangement of silyl enol ether and subsequent formation of the enol triflates. Triethylsilyl enol ether, derived from cyclohexanone, was treated with a combination of LDA and t-BuOK in n-hexane/THF to encourage the migration of the silyl group to generate an α-silyl enolate. Subsequently, the α-silyl enolate was reacted with Comins’ reagent to yield the corresponding enol triflate. Finally, the α-silylated trisubstituted lithium enolate for the synthesis of 1,2-cyclohexadiene precursor was isomerized in the presence of a stoichiometric amount of water for one hour at room temperature to exclusively provide tetrasubstituted lithium enolate for the synthesis of cyclohexyne precursor in one pot.
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Saculsan, Phoebe Grace J. y Akihisa Mori. "What Can the Philippines Learn from Thailand`s ENCON Fund in Overcoming the Barriers to Developing Renewable Energy Resources". Journal of Clean Energy Technologies 6, n.º 4 (julio de 2018): 278–83. http://dx.doi.org/10.18178/jocet.2018.6.4.474.

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Yang, Jinghui y Yan Xia. "Mechanochemical generation of acid-degradable poly(enol ether)s". Chemical Science 12, n.º 12 (2021): 4389–94. http://dx.doi.org/10.1039/d1sc00001b.

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Deng, Wei, Jiannan Xiang, Niannian Yi, Yi Xiong, De Chen, Sheng Zeng, Chaozhihui Cheng y Pengjie Wang. "Synthesis of β-CF3 Ketones through Copper/Silver Cocatalyzed Oxidative Coupling of Enol Acetates with ICH2CF3". Synlett 29, n.º 17 (22 de agosto de 2018): 2279–82. http://dx.doi.org/10.1055/s-0037-1610257.

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A simple method for the synthesis of β-CF3 ketones through copper/silver cocatalyzed oxidative coupling of enol acetates with ICH2CF3 has been developed. Enol acetates were chosen as the source of carbonyl group, giving the β-CF3 ketones in moderate yields. Control experiments imply that a radical process maybe involved in this reaction.
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Kumar, Manjeet. "Enol Acetates". Synlett 2011, n.º 15 (12 de agosto de 2011): 2272–73. http://dx.doi.org/10.1055/s-0030-1261159.

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Yang, Jinghui y Yan Xia. "Correction: Mechanochemical generation of acid-degradable poly(enol ether)s". Chemical Science 12, n.º 13 (2021): 4986. http://dx.doi.org/10.1039/d1sc90053f.

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Lanari, Daniela, Chiara Morozzi, Ornelio Rosati y Massimo Curini. "A Solvent-Free Reaction for Silyl Enol Ethers Synthesis". Synlett 29, n.º 01 (22 de agosto de 2017): 126–30. http://dx.doi.org/10.1055/s-0036-1590876.

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Silyl enol ethers are extremely useful nucleophilic intermediates for chemical transformations because they are synthetically versatile substrates for a wide range of C–C bond-forming reactions. Here, we present a new, mild, and solvent-free procedure for the synthesis of silyl enol ethers that employs a catalytic amount of solid-supported base and an equimolar amount of N,O-(bistrimethylsilyl)acetamide as a silylating agent.
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10

Fan, Ying-Ju, Jian-Ping Ma y Zhong-Xi Sun. "Bis{(E)-1-[1-(2-pyridyl)ethylidene]thiosemicarbazonato-κ3 N,N′,S}gallium(III) nitrate". Acta Crystallographica Section E Structure Reports Online 63, n.º 11 (5 de octubre de 2007): m2663. http://dx.doi.org/10.1107/s160053680704799x.

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Reaction of gallium(III) nitrate with (E)-1-[1-(2-pyridyl)ethylidene]thiosemicarbazide (petc) afforded the title complex, [Ga(C8H9N4S)2]NO3. The title complex contains one GaIII cation and two enol-form petc anions, accompanied by one charge-balancing disordered nitrate anion. The petc is in the enol form, coordinating to the GaIII centre via one S atom and two N atoms. Thus, the GaIII centre assumes a distorted octahedral coordination geometry.
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Tesis sobre el tema "Encol S.A"

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Barros, Thiago Medeiros. "Supervis?rio Inteligente de Processos na Id?stria do Petr?leo e G?s :Aplica??o em uma Coluna de Destila??o Simulada Integrada a Instrumenta??o Real". Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15204.

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Made available in DSpace on 2014-12-17T14:55:08Z (GMT). No. of bitstreams: 1 ThiagoMB_DISSERT.pdf: 1745996 bytes, checksum: af67dc28800011b16eb3931959630ac2 (MD5) Previous issue date: 2012-11-12
Funda??o Norte-Riograndense de Pesquisa e Cultura
The need to implement a software architecture that promotes the development of a SCADA supervisory system for monitoring industrial processes simulated with the flexibility of adding intelligent modules and devices such as CLP, according to the specifications of the problem, it was the motivation for this work. In the present study, we developed an intelligent supervisory system on a simulation of a distillation column modeled with Unisim. Furthermore, OLE Automation was used as communication between the supervisory and simulation software, which, with the use of the database, promoted an architecture both scalable and easy to maintain. Moreover, intelligent modules have been developed for preprocessing, data characteristics extraction, and variables inference. These modules were fundamentally based on the Encog software
A necessidade de desenvolver uma arquitetura de software que promovesse o desenvolvimento de supervis?rio SCADA para monitora??o de processos industriais simulados, com flexibilidade de agregar m?dulos inteligentes e equipamentos como CLP, de acordo com as especifica??es do problema, foi a for?a motriz desse trabalho. No presente estudo foi desenvolvido um supervis?rio inteligente sobre uma simula??o de uma coluna de destila??o modelada no Unisim. Foi utilizado como comunica??o entre o supervis?rio e o software de simula??o o OLE Automation, o qual, junto ao uso de banco de dados, promoveu uma arquitetura de f?cil manuten??o e escal?vel. Foram desenvolvidos ainda m?dulos inteligentes para pr?processamento, extra??o de caracter?sticas dos dados e infer?ncia de vari?veis. Estes m?dulos tiveram como base principal o software Encog.
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2

Denys, Goument Colombe. "Dicétones-1,4 thiosubstituées". Rouen, 1988. http://www.theses.fr/1988ROUES023.

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3

George, Nicolas. "Étude de la synthèse totale de tétrahydroisoquinoléines naturelles : quinocarcine, Tétrazomine et Lémonomycine. : rapide accés aux α-amidosulfures et leur utilisation en tant que précurseurs de N-acylimines dans la réaction de Friedel-Crafts". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00980348.

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La quinocarcine, la tétrazomine et la lémonomycine constituent une sous-famille appartenant à la famille des tétrahydroisquinoléines trisubstituées naturelles. Ce sont des puissants agents cytotoxiques et possèdent de nombreuses activités biologiques telles qu'antitumorales et antibiotiques. Leur complexité structurale, leurs intérêts biologiques ainsi que leur faible rendement d'extraction du milieu naturel font de ces molécules des cibles attrayantes pour les chimistes de synthèse.Ces trois molécules sont constituées d'une tétrahydroisoquinoléine différemment substitué fusionnée avec un diazabicycle[3.2.1]octane commun. Le but de ce projet était de mettre au point une stratégie commune à cette sous-famille et divergente grâce à la synthèse du diazabicyclooctane en premier. Une première stratégie faisant intervenir une aziridine n'a pas permis de construire le bicycle. Cet objectif a été réalisé grâce à une seconde stratégie. Elle repose sur une première cyclisation d'un hémiaminal puis d'une cyclisation par addition nucléophile d'un éther d'énol silylé sur un N-acylimmonium formé in situ au départ d'un N,S-acétal.Parallèlement à cette étude synthétique, nous avons mis au point une réaction multicomposant séquentielle qui permet l'accès rapide et général aux a-amidosulfures, comblant un manque dans la littérature. Ensuite nous avons étudié la réactivité de ces composés en tant que précurseurs simples de N-acylimines en conditions acides douces. Trois conditions réactionnelles, nous ont permis d'accéder à cette objectif : l'utilisation stœchiométrique d'acétate d'argent, catalytique d'acide phosphorique ainsi que le NIS en quantité stœchiométrique et catalytique. Cette dernière réaction est très attrayante. En effet, ce réactif doux et neutre permet l'élimination efficace du thiol formant la N-acylimine puis son activation pour se faire piéger in situ par un nucléophile. Les rendements atteints sont très hauts en moins de 5 minutes.
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Huang, Pu-Hang y 黃普航. "Rhodium/Chiral Diene-catalyzed Enantioselective Additionof Potassium Enol Ether Trifluoroborates to N-TosylAldimines: Synthesis of (S)-Dapoxetine". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/52611925905923444581.

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Libros sobre el tema "Encol S.A"

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Tobin, John B. The effect of gas-silicon substitution on keto-enol equilibrium in aqueous solution. Ottawa: National Library of Canada, 1990.

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Capítulos de libros sobre el tema "Encol S.A"

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Takeda, T. y A. Tsubouchi. "Enol Ethers". En Acetals: O/N, S/S, S/N, and N/N and Higher Heteroatom Analogues, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-030-00116.

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Leung, M. k. y T. Y. Luh. "Reactions with Enol Ethers". En Acetals: O/N, S/S, S/N, and N/N and Higher Heteroatom Analogues, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-030-00231.

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von Angerer, S. y S. L. Warriner. "From Enol Ethers". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00383.

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Ley, S. V., L. G. Milroy y R. M. Myers. "Silyl Enol Addition". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00560.

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Nakata, M. "Thioacetalization of Hemiacetals, ,-Acetals, ,-Acetals, and Enol Ethers". En Acetals: O/N, S/S, S/N, and N/N and Higher Heteroatom Analogues, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-030-00279.

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Chemla, F., F. Ferreira y B. Roy. "Synthesis from Enol Ethers". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00766.

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Benneche, T. "Formation of Enol Ethers". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00177.

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Benneche, T. "Bromination of Enol Ethers". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00204.

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von Angerer, S. y S. L. Warriner. "Synthesis from Enol Derivatives". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00381.

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von Angerer, S. y S. L. Warriner. "From Silyl Enol Ethers". En Acetals: Hal/X and O/O, S, Se, Te, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-029-00382.

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Actas de conferencias sobre el tema "Encol S.A"

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Mavuru, Lydia y Oniccah Koketso Pila. "PRE-SERVICE TEACHERS’ PREPAREDNESS AND CONFIDENCE IN TEACHING LIFE SCIENCES TOPICS: WHAT DO THEY LACK?" En International Conference on Education and New Developments. inScience Press, 2021. http://dx.doi.org/10.36315/2021end023.

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Pre-service teachers’ preparedness and confidence levels to teach is a topical subject in higher education. Previous studies have commented on the role of teacher in-service training in preparing teachers for provision of meaningful classroom experiences to their learners, but many researchers regard pre-service teacher development as the cornerstone. Whilst teacher competence can be measured in terms of different variables e.g. pedagogy, knowledge of the curriculum, technological knowledge etc., the present study focused on teacher competency in terms of Life Sciences subject matter knowledge (SMK). The study was framed by pedagogical content knowledge (PCK). The study sought to answer the research question: How do preservice teachers perceive their levels of preparedness and confidence in teaching high school Life Sciences topics at the end of their four years of professional development? In a qualitative study, a total of 77 pre-service teachers enrolled for the Methodology and Practicum Life Sciences course at a university in South Africa participated in the study. Each participant was tasked to identify topic(s)/concept(s) in Life Sciences they felt challenged to teach, provide a critical analysis of the reasons for that and map the way forward to overcome the challenges. This task was meant to provide the pre-service teachers with an opportunity to reflect and at the same time evaluate the goals of the learning programme they had gone through. Pre-service teachers’ perspectives show their attitudes, values and beliefs based on their personal experiences which therefore help them to interpret their teaching practices. The qualitative data was analysed using content analysis. The findings showed that whilst pre-service teachers were competent to teach other topics, the majority felt that they were not fully prepared and hence lacked confidence to teach the history of life on earth and plant and animal tissues in grade 10; excretion in animals particularly the functions of the nephron in grade 11; and evolution and genetics in grade 12. Different reasons were proffered for the lack of preparedness to teach these topics. The participants regarded some of these topics as difficult and complex e.g. genetics. Evolution was considered to be antagonistic to the participants’ and learners’ cultural and religious belief systems. Hence the participants had negative attitudes towards them. Some of the pre-service teachers indicated that they lacked interest in some of the topics particularly the history of life on earth which they considered to be more aligned to Geography, a subject they did not like. As remedies for their shortcomings in the content, the pre-service teachers planned to co-teach these topics with colleagues, and others planned to enrol for content enrichment programmes. These findings have implications for teacher professional development programmes.
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