Browsing by Title
Now showing items 4180-4199 of 40250
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Asymmetric a-functionalization of cyclid ketones promoted by bronsted base/H-bond catalysts.
(2019-11-18)En esta tesis doctoral se han desarrollado nuevas metodologías para la -funcionalización regio- y estereoselectiva de cetonas cíclicas. Para ello se han empleado catalizadores con carácter bifuncional base de Brønsted/dador ... -
Asymmetric a-functionatlization of barbituric acids via bronsted base catalysis.
(2019-01-18)El objetivo de esta tesis ha sido lograr la ¿-desimetrización de amidas por medio de la organocatálisis.Este estudio ha sido enfocado a dos subconjuntos de amidas: derivados del ácido barbitúrico y ¿-iminoamidas, debido a ... -
Asymmetric catalytic approach to a-functionalized amides.
(2020-02-28)En la presente Tesis Doctoral, se han desarrollado dos nuevos pronucleófilos para reacciones catalíticas promovidas por bases de Brønsted (BB) quirales bifuncionales.Por un lado se ha demostrado la utilidad de las ... -
Asymmetric Dual Enamine Catalysis/Hydrogen Bonding Activation
(MDPI, 2023-07-11)Asymmetric enamine base activation of carbonyl compounds is a well-known and widely used strategy for providing functionalization of organic compounds in an efficient way. The use of solely organic substances, which in ... -
Asymmetric flow networks
(Departamento de Fundamentos del Análisis Económico I, UPV-EHU, 2012-06-22)This paper provides a new model of network formation that bridges the gap between the two benchmark models by Bala and Goyal, the one-way flow model, and the two-way flow model, and includes both as particular extreme ... -
Asymmetric Mannich reactions of (S)-N-tert-butylsulfinyl-3,3,3-trifluoroacetaldimines with yne nucleophiles
(Beilstein-Institut, 2020-10-29)In the present work, arylethynes were studied as new C-nucleophiles in the asymmetric Mannich addition reactions with (S)-N-tert-butylsulfinyl-3,3,3-trifluoroacetaldimine. The reactions were conducted under operationally ... -
Asymmetric Michael Addition in Synthesis of β-Substituted GABA Derivatives
(MDPI, 2022)γ-Aminobutyric acid (GABA) represents one of the most prolific structural units widely used in the design of modern pharmaceuticals. For example, β-substituted GABA derivatives are found in numerous neurological drugs, ... -
Asymmetric Organocatalysis: A Survival Guide to Medicinal Chemists
(MDPI, 2022-12-29)Majority of drugs act by interacting with chiral counterparts, e.g., proteins, and we are, unfortunately, well-aware of how chirality can negatively impact the outcome of a therapeutic regime. The number of chiral, non-racemic ... -
Asymmetric organocatalytic cascade reactions
(2014-03-12)[ES]En la presente memoria se recoge el trabajo de investigación enmarcado en elempleo de aminas secundarias quirales como organocatalizadores para el diseño dereacciones en cascada con el fin de obtener compuestos de ... -
Asymmetric quantum devices and heat transport
(2021-05-19)Motivada por el impacto tecnológico del diodo eléctrico, esta tesis se dedica a explorar la física y los posibles diseños de dispositivos que tienen una respuesta asimétrica a estímulos externos. Se estudian dispositivos ... -
Asymmetric Switch Costs in Numeral Naming and Number Word Reading: Implications for Models of Bilingual Language Production
(Frontiers in Psychology, 2016)One approach used to gain insight into the processes underlying bilingual language comprehension and production examines the costs that arise from switching languages. For unbalanced bilinguals, asymmetric switch costs are ... -
Asymmetric Synthesis of Adjacent Tri- and Tetrasubstituted Carbon Stereocenters: Organocatalytic Aldol Reaction of an Hydantoin Surrogate with Azaarene 2-Carbaldehydes
(Wiley-VCH, 2019-07-18)A bifunctional amine/squaramide catalyst promoted direct aldol addition of an hydantoin surrogate to pyridine 2-carbaldehyde N-oxides to afford adducts bearing two vicinal tertiary/quaternary carbons in high diastereo- and ... -
Asymmetric Synthesis of N-Fmoc-(S)-7-aza-tryptophan via Alkylation of Chiral Nucleophilic Glycine Equivalent
(Wiley, 2021-06-07)Ni(II)-complexes, derived from glycine Schiff bases with chiral tridentate ligands, have been used as powerful tools for the synthesis of structurally diverse tailor-made amino acids. In this manuscript, asymmetric alkylation ... -
Asymmetric Synthesis of Tailor-Made Amino Acids Using Chiral Ni(II) Complexes of Schiff Bases. An Update of the Recent Literature
(MDPI, 2020-06-12)Tailor-made amino acids are indispensable structural components of modern medicinal chemistry and drug design. Consequently, stereo-controlled preparation of amino acids is the area of high research activity. Over last ... -
Asymmetric Synthesis of Tetrasubstituted α-Aminophosphonic Acid Derivatives
(MDPI, 2021-05-27)Due to their structural similarity with natural α-amino acids, α-aminophosphonic acid derivatives are known biologically active molecules. In view of the relevance of tetrasubstituted carbons in nature and medicine and the ... -
Asymmetric transformations of donor-acceptor cyclopropanes under bronsted acid catalysis
(2019-10-10)Los ciclopropanos dadores-aceptores, son considerados importantes estructuras en la construcción de moleculas más complejas, debido a su tendencia termodinámica a sufrir apertura de anillo impulsada por la liberación de ... -
Asymmetric transformations under chiral bronsted acid catalysis: (4+3) cycloaddition and allylboration of imines
(2017-05-19)La memoria recoge el estudio y desarrollo de diversas reacciones organocatalíticas enantioselectivas. Explorando, en primer lugar, la utilización de alenamidas como precursores de cationes oxaalílicos en la cicloadición ... -
Asymmetries in Hungarian
(Servicio Editorial de la Universidad del País Vasco/Euskal Herriko Unibertsitatearen Argitalpen Zerbitzua, 1991)In this thesis I would like to defend the hypothesis that Hungarian is a configurational language. There has been much discussion in recent years concerning the question whether Hungarian is a configurational language or ... -
Asymptotic Comparison of the Solutions of Linear Time-Delay Systems with Point and Distributed Lags with Those of Their Limiting Equations
(Hindawi Publishing Corporation, 2009)This paper investigates the relations between the particular eigensolutions of a limiting functional differential equation of any order, which is the nominal (unperturbed) linear autonomous differential equations, and the ... -
Asymptotic Hyperstability and Input–Output Energy Positivity of a Single-Input Single-Output System Which Incorporates a Memoryless Non-Linear Device in the Feed-Forward Loop
(MDPI, 2022)This paper visualizes the role of hyperstable controllers in the closed-loop asymptotic stability of a single-input single-output system subject to any nonlinear and eventually time-varying controller within the hyperstable ...