作者: avulsion 時間: 2025-3-21 22:26 作者: Figate 時間: 2025-3-22 04:03 作者: 跳動 時間: 2025-3-22 07:32 作者: 嚙齒動物 時間: 2025-3-22 10:37
Organocatalysis978-3-540-73495-6Series ISSN 0947-6075 作者: accomplishment 時間: 2025-3-22 14:25 作者: 破裂 時間: 2025-3-22 17:36 作者: 要求比…更好 時間: 2025-3-22 22:38
Chiral Organocatalysts for Enantioselective Photochemical Reactions,eed for enantioselective photochemical reactions is immediately linked to the challenge of establishing the first stereogenic centre in a?molecule by organic photochemistry. Hydrogen bonds were identified as ideal means to embed a?prochiral substrate into a?chiral environment. The combination of a?b作者: 木質(zhì) 時間: 2025-3-23 03:43 作者: 發(fā)現(xiàn) 時間: 2025-3-23 06:41 作者: Figate 時間: 2025-3-23 11:06 作者: TRUST 時間: 2025-3-23 14:55
,-Heterocyclic Carbenes: Organocatalysts Displaying Diverse Modes of Action,riety of different transformations. Starting from the early investigations on benzoin, and later Stetter reactions, the mechanistic diversity of .-heterocyclic carbenes, depending on their properties, has led to the development of several unprecedented catalytic reactions. This article will provide 作者: Increment 時間: 2025-3-23 20:18 作者: Directed 時間: 2025-3-24 01:45
Nucleophilic Carbenes as Organocatalysts,d umpolung reactions, thiazolium salt-derived NHC have been used successfully for decades. Even so, during recent years there has been an increased interest in NHC-catalyzed transformations and many new reactions have been developed. This article focuses on the use of NHC in the conjugate umpolung o作者: 暫時休息 時間: 2025-3-24 03:56 作者: FAR 時間: 2025-3-24 08:43
,New Developments in Enantioselective Br?nsted Acid Catalysis: Chiral Ion Pair Catalysis and Beyond,arch area has resulted in substantial progress, particularly in the field of metal catalyzed transformations. In recent years small organic molecules have been used as organocatalysts for a?variety of enantioselective reactions. Among these, secondary amine catalysts are the most widely applied and 作者: 劇毒 時間: 2025-3-24 11:02 作者: 砍伐 時間: 2025-3-24 18:51 作者: archetype 時間: 2025-3-24 19:52
,Biomimetic Organocatalytic C–C-Bond Formations,active species is a?nucleophilic carbene. Mimicking this approach, organocatalytic carbene catalysis has emerged to an exceptionally fruitful research area, which is used in asymmetric C–C bond formations.作者: Mendicant 時間: 2025-3-25 01:35
Controlling the Selectivity and Stability of Proteins by New Strategies in Directed Evolution: The of addressing this crucial question. This chapter reviews the concept of ISM and its application in controlling the enantioselectivity and thermostability of enzymes, specifically those that have an organocatalytic mechanism. Illustrative examples include the directed evolution of lipases, Baeyer-Villigerases and epoxide hydrolases.作者: 天氣 時間: 2025-3-25 03:30 作者: formula 時間: 2025-3-25 08:37 作者: 使痛苦 時間: 2025-3-25 13:37 作者: 不規(guī)則 時間: 2025-3-25 15:53 作者: 進入 時間: 2025-3-25 20:12
Recoverable, Soluble Polymer-Supported Organic Catalysts, ligands and catalysts. This chapter highlights the more recent results obtained by our group in the field of poly(ethylene glycol) (PEG)-supported chiral and achiral organic catalysts. A?few considerations on the methodologies, the future and the problems related to the immobilization of chiral organic catalysts are also briefly discussed.作者: COM 時間: 2025-3-26 01:55
Organocatalysis by Hydrogen Bonding Networks,ctones, affording enantiomerically pure α-amino acids; and kinetic resolution of oxazinones, affording enantiomerically pure β-amino acids. All four types of transformations are of preparative value, and their mechanisms are discussed.作者: cluster 時間: 2025-3-26 06:27
,-Heterocyclic Carbenes: Organocatalysts Displaying Diverse Modes of Action,erocyclic carbenes, depending on their properties, has led to the development of several unprecedented catalytic reactions. This article will provide an overview of the versatile reactivity of .-heterocyclic carbenes.作者: Morbid 時間: 2025-3-26 10:06
Chiral Organocatalysts for Enantioselective Photochemical Reactions,its almost quantitative recovery and its reuse, it has so far been used in a?catalytic sense only in a?single case. For the development of photochemical organocatalysts it was proposed to prepare modified templates, in which a?light-collecting device acts simultaneously as sensitiser and as a?steric作者: delta-waves 時間: 2025-3-26 14:56
,New Developments in Enantioselective Br?nsted Acid Catalysis: Chiral Ion Pair Catalysis and Beyond,ctivation of an electrophile or nucleophile by use of a?chiral Br?nsted acid. Compared to amino-, carbene-, pyridine- and hydrogen-bonding catalyzed transformations, enantioselective Br?nsted acid catalysis has only recently emerged as important and promising area of research. In the course of our r作者: Lacerate 時間: 2025-3-26 17:19 作者: 含糊 時間: 2025-3-26 23:35 作者: labile 時間: 2025-3-27 04:45 作者: 歡呼 時間: 2025-3-27 06:03 作者: 沉積物 時間: 2025-3-27 11:55
Critical Discourse Analysis in Educationturned to CDA. This chapter provides a consolidated overview of the state of CDA in education by drawing on a literature review that surveys 30 years of scholarship. It presents three interrelated qualities of research design that continue to be salient for literacy researchers using CDA: reflexivit作者: 樹膠 時間: 2025-3-27 15:45 作者: 從容 時間: 2025-3-27 18:20
Protein Structure,o-tail arrangement through substituted amide linkages called peptide bonds. Each protein molecule has a precise length composed of an exact sequence of amino acids which are arranged in a linear, unbranched fashion.作者: NIL 時間: 2025-3-27 23:24 作者: 躺下殘殺 時間: 2025-3-28 02:39
Stuart Marshall Bender,Mick Broderickerforming an online shopping task. Results show that anxious shoppers have lower perceptions of the dimensions of flow, believe online shopping websites are less useful, and believe they are less likely to use the system in the future compared to the other three groups of online shoppers.作者: PANEL 時間: 2025-3-28 09:57
Reminiscing About the Golden Age: An Analysis of Efforts to Revive the Hong Kong Film Industry Throuspite those laudable efforts, success has been limited. The key to restoring the film industry to its former glory lies in reforming the traditional Hong Kong copyright framework, including reconstructing the copyright ownership rule, providing breathing space for secondary creation, and decriminalizing individual, noncommercial online sharing.作者: 心神不寧 時間: 2025-3-28 12:40
Ayn Rand’s ,: “Laissez-Faire” Fiction?isimilitude. The novel’s wider popularity may testify to its deep “Americanness,” but its “democratic deficit” prevents it from qualifying as a Great American Novel in terms of Lawrence Buell’s recent exploration of the concept.作者: acclimate 時間: 2025-3-28 15:30 作者: 不開心 時間: 2025-3-28 19:15
Ricardo Zugaib Abdalla,Thiago Nogueira Costato the cognitive sciences is a relatively recent idea. Prior to the 1990s, phenomenology was employed in a critique of the first wave of cognitivist and computational approaches to the mind (see Dreyfus 1972). What some consider a second wave in cognitive science, with emphasis on connectionism and 作者: Decongestant 時間: 2025-3-28 23:44
Corporate Responsibility and Gender: Failing Women Workers in Global Productionponsibility, focusing on social compliance as one of its most pervasive tenets. It highlights the main gender risks in GVCs and examines why social audits have failed to address gender issues (with examples from apparel). It considers why some MNCs are beginning to focus on gender within corporate r作者: THE 時間: 2025-3-29 04:09
Dynamic Traffic Assignment in Congested Networks,dem Mitfühlen erschlie?en, zu erfassen und zu verstehen versucht. Mit dem Begriff der Lebensbewegungen soll a priori einer unpsychologischen Festschreibung oder Zerstückelung des Seelischen vorgebeugt und von Beginn an das Ganze sich entwickelnder Erlebnis- oder Handlungseinheiten beachtet werden.作者: 詞根詞綴法 時間: 2025-3-29 09:14 作者: promote 時間: 2025-3-29 15:17
Book 2018eoretisch eine materialistische mit einer idealistischen Auffassung. Der vorliegende Band. .erg?nzt die bereits erschienenen .essentials .?Umweltgeschichte im überblick“ und ?Umweltgeschichte in Beispielen“ desselben Autorenteams..作者: 松果 時間: 2025-3-29 16:43
