Artículos de revistas: "CHIMICA ORGANICA"

1

Wirz, Jakob. "Mechanistic Organic Photochemistry". CHIMIA International Journal for Chemistry 61, n.º 10 (24 de octubre de 2007): 638–40. http://dx.doi.org/10.2533/chimia.2007.638.

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2

Herdlitschka, Andreas, Bartosz Lewandowski y Helma Wennemers. "Organic Molecular Weaves". CHIMIA International Journal for Chemistry 73, n.º 6 (26 de julio de 2019): 450–54. http://dx.doi.org/10.2533/chimia.2019.450.

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3

Heilbronner, Edgar y M. Volkan Kisakürek. "75 YEARS OFHELVETICA CHIMICA ACTA". Helvetica Chimica Acta 75, n.º 1 (5 de febrero de 1992): 1–20. http://dx.doi.org/10.1002/hlca.19920750102.

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4

Fürst, Andor, Georg Brubacher, Werner Meier y August Rüttimann. "DieHelvetica Chimica Actaund die Vitamine". Helvetica Chimica Acta 76, n.º 1 (10 de febrero de 1993): 1–59. http://dx.doi.org/10.1002/hlca.19930760102.

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5

HEIMGARTNER, H. y H. J. HANSEN. "ChemInform Abstract: Organic Photochemistry in the Mirror of Helvetica Chimica Acta". ChemInform 24, n.º 33 (20 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199333309.

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6

Huang, Hsin-Hua y Tomáš Šolomek. "Photochemistry Meets Porous Organic Cages". CHIMIA International Journal for Chemistry 75, n.º 4 (28 de abril de 2021): 285–90. http://dx.doi.org/10.2533/chimia.2021.285.

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Chemistry of porous organic cages has developed in the past decade as an alternative to the wellknown nanoporous materials based on extended networks, such as metal organic frameworks (MOFs) or covalent organic frameworks (COFs). Unlike these extended polymeric materials, the molecular nature of organic cages offers important advantages, such as solubility of the material in common organic solvents. However, a simultaneous combination of porosity and additional optoelectronic properties, common in MOFs and COFs, is still quite rare. Therefore, porous organic cages are relatively underdeveloped when compared to MOFs and COFs. Here, we highlight the rich possibilities the porous organic cages offer and discuss the recent development where interesting photophysical properties augment the porosity, including our own work.

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7

Borduas-Dedekind, Nadine, Sergey Nizkorodov y Kristopher McNeill. "UVB-irradiated Laboratory-generated Secondary Organic Aerosol Extracts Have Increased Cloud Condensation Nuclei Abilities: Comparison with Dissolved Organic Matter and Implications for the Photomineralization Mechanism". CHIMIA International Journal for Chemistry 74, n.º 3 (25 de marzo de 2020): 142–48. http://dx.doi.org/10.2533/chimia.2020.142.

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During their atmospheric lifetime, organic compounds within aerosols are exposed to sunlight and undergo photochemical processing. This atmospheric aging process changes the ability of organic aerosols to form cloud droplets and consequently impacts aerosol–cloud interactions. We recently reported changes in the cloud forming properties of aerosolized dissolved organic matter (DOM) due to a photomineralization mechanism, transforming high-molecular weight compounds in DOM into organic acids, CO and CO2. To strengthen the implications of this mechanism to atmospheric aerosols, we now extend our previous dataset and report identical cloud activation experiments with laboratory-generated secondary organic aerosol (SOA) extracts. The SOA was produced from the oxidation of α-pinene and naphthalene, a representative biogenic and anthropogenic source of SOA, respectively. Exposure of aqueous solutions of SOA to UVB irradiation increased the dried organic material's hygroscopicity and thus its ability to form cloud droplets, consistent with our previous observations for DOM. We propose that a photomineralization mechanism is also at play in these SOA extracts. These results help to bridge the gap between DOM and SOA photochemistry by submitting two differently-sourced organic matter materials to identical experimental conditions for optimal comparison.

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8

Mazet, Clément, Andreas Zumbuehl, Damien Jeannerat, Jiri Mareda, Alexandre Alexakis, E. Peter Kündig, Jérôme Lacour y Stefan Matile. "Organic Chemistry à la Genevoise". CHIMIA International Journal for Chemistry 63, n.º 12 (1 de diciembre de 2009): 816–21. http://dx.doi.org/10.2533/chimia.2009.816.

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9

Gryn'ova, Ganna y Clémence Corminboeuf. "Conceptual Framework of Organic Electronics". CHIMIA International Journal for Chemistry 73, n.º 4 (24 de abril de 2019): 245–51. http://dx.doi.org/10.2533/chimia.2019.245.

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10

Müller, Klaus. "Organic Fluorine: The Mighty Mite". CHIMIA International Journal for Chemistry 73, n.º 5 (29 de mayo de 2019): 417–19. http://dx.doi.org/10.2533/chimia.2019.417.

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11

jack, Thomas, Jonathan Simonin, Suradech Singhanat y Christian G. Bochet. "41th CUSO Summer School in Organic Chemistry, 29.8–2.9.2010 'Unconventional Methods in Organic Synthesis'". CHIMIA International Journal for Chemistry 65, n.º 1 (23 de febrero de 2011): 97–99. http://dx.doi.org/10.2533/chimia.2011.97.

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12

Venanzi, Luigi M. "Helvetica Chimica Acta and Coordination Chemistry". Helvetica Chimica Acta 75, n.º 1 (5 de febrero de 1992): 21–61. http://dx.doi.org/10.1002/hlca.19920750103.

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13

Würfel, Peter. "Photovoltaic Principles and Organic Solar Cells". CHIMIA International Journal for Chemistry 61, n.º 12 (19 de diciembre de 2007): 770–74. http://dx.doi.org/10.2533/chimia.2007.770.

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14

Siegel, Jay S. y Heinz Heimgartner. "Institute of Organic Chemistry: 1983–2008". CHIMIA International Journal for Chemistry 62, n.º 3 (26 de marzo de 2008): 114–21. http://dx.doi.org/10.2533/chimia.2008.114.

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15

Ley, Steven V. y Ian R. Baxendale. "The Changing Face of Organic Synthesis". CHIMIA International Journal for Chemistry 62, n.º 3 (26 de marzo de 2008): 162–68. http://dx.doi.org/10.2533/chimia.2008.162.

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16

Hermes, Jens Peter, Fabian Sander, Torsten Peterle y Marcel Mayor. "Nanoparticles to Hybrid Organic-Inorganic Superstructures". CHIMIA International Journal for Chemistry 65, n.º 4 (27 de abril de 2011): 219–22. http://dx.doi.org/10.2533/chimia.2011.219.

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17

Bopp, Charlotte E., Hans-Peter E. Kohler y Thomas B. Hofstetter. "Enzyme Kinetics of Organic Contaminant Oxygenations". CHIMIA International Journal for Chemistry 74, n.º 3 (25 de marzo de 2020): 108–14. http://dx.doi.org/10.2533/chimia.2020.108.

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Enzymatic oxygenations initiate biodegradation processes of many organic soil and water contaminants. Even though many biochemical aspects of oxygenation reactions are well-known, quantifying rates of oxidative contaminant removal as well as the extent of oxygenation remains a major challenge. Because enzymes use different strategies to activate O2, reactions leading to substrate oxygenation are not necessarily limiting the rate of contaminant removal. Moreover, oxygenases react along unproductive pathways without substrate metabolism leading to O2 uncoupling. Here, we identify the critical features of the catalytic cycles of selected oxygenases that determine rates and extents of biodegradation. We focus most specifically on Rieske dioxygenases, a subfamily of mononuclear non-heme ferrous iron oxygenases, because of their ability to hydroxylate unactivated aromatic structures and thus initiate the transformation of the most persistent organic contaminants. We illustrate that the rate-determining steps in their catalytic cycles range from O2 activation to substrate hydroxylation, depending on the extent of O–O cleavage that is required for generating the reactive Fe-oxygen species. The extent of O2 uncoupling, on the other hand, is highly substrate-specific and potentially modulated by adaptive responses to oxidative stress. Understanding the kinetic mechanisms of oxygenases will be key to assess organic contaminant biotransformation quantitatively.

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18

Yamamoto, Hisashi y Matthew B. Boxer. "Super Brønsted Acid Catalysis in Organic Synthesis". CHIMIA International Journal for Chemistry 61, n.º 5 (30 de mayo de 2007): 279–81. http://dx.doi.org/10.2533/chimia.2007.279.

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19

Benmansour, Hadjar, Fernando A. Castro, Matthias Nagel, Jakob Heier, Roland Hany y Frank Nüesch. "Ionic Space Charge Driven Organic Photovoltaic Devices". CHIMIA International Journal for Chemistry 61, n.º 12 (19 de diciembre de 2007): 787–91. http://dx.doi.org/10.2533/chimia.2007.787.

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20

Zhou, Shengze, Hardeep Farwaha y John A. Murphy. "The Development of Organic Super Electron Donors". CHIMIA International Journal for Chemistry 66, n.º 6 (27 de junio de 2012): 418–24. http://dx.doi.org/10.2533/chimia.2012.418.

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21

Kalvoda, Jaroslav. "60 Jahre Steroid-Chemie inHelvetica Chimica Acta". Helvetica Chimica Acta 75, n.º 8 (16 de diciembre de 1992): 2341–446. http://dx.doi.org/10.1002/hlca.19920750802.

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22

Heimgartner, Heinz y Hans-J�rgen Hansen. "Organische Photochemie im Spiegel vonHelvetica Chimica Acta". Helvetica Chimica Acta 76, n.º 3 (12 de mayo de 1993): 1027–114. http://dx.doi.org/10.1002/hlca.19930760302.

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23

Bürgi, Hans-Beat y Jack D. Dunitz. "Structural chemistry inHelvetica Chimica Acta, 1917-1992". Helvetica Chimica Acta 76, n.º 3 (12 de mayo de 1993): 1115–66. http://dx.doi.org/10.1002/hlca.19930760303.

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24

Abele, Stefan. "Organic Chemistry: At the Core of Idorsia's Business". CHIMIA 75, n.º 12 (29 de diciembre de 2021): 1085. http://dx.doi.org/10.2533/chimia.2021.1085.

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25

Wang, Mei-Xiang. "Progress of Enantioselective Nitrile Biotransformations in Organic Synthesis". CHIMIA International Journal for Chemistry 63, n.º 6 (24 de junio de 2009): 331–33. http://dx.doi.org/10.2533/chimia.2009.331.

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26

Némethová, Ivana, Leonidas-Dimitrios Syntrivanis y Konrad Tiefenbacher. "Molecular Capsule Catalysis: Ready to Address Current Challenges in Synthetic Organic Chemistry?" CHIMIA International Journal for Chemistry 74, n.º 7 (12 de agosto de 2020): 561–68. http://dx.doi.org/10.2533/chimia.2020.561.

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Self-assembled molecular capsules, host structures that form spontaneously when their building blocks are mixed, have been known since the 1990s. They share some basic similarities with enzyme pockets, as they feature defined hydrophobic binding pockets that are able to bind molecules of appropriate size and shape. The potential to utilize such host structures for catalysis has been explored since their discovery; however, applications that solve current challenges in synthetic organic chemistry have remained limited. In this short article, we discuss the challenges associated with the use of molecular capsules as catalysts, and highlight some recent applications of supramolecular capsules to overcome challenges in synthetic organic chemistry.

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27

Bojarová, Pavla y Vladimír Kren. "Glycosidases in Carbohydrate Synthesis: When Organic Chemistry Falls Short". CHIMIA International Journal for Chemistry 65, n.º 1 (23 de febrero de 2011): 65–70. http://dx.doi.org/10.2533/chimia.2011.65.

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28

Hofstetter, Thomas B., Jakov Bolotin, Sarah G. Pati, Marita Skarpeli-Liati, Stephanie Spahr y Reto S. Wijker. "Isotope Effects as New Proxies for Organic Pollutant Transformation". CHIMIA International Journal for Chemistry 68, n.º 11 (26 de noviembre de 2014): 788–92. http://dx.doi.org/10.2533/chimia.2014.788.

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29

Stylianou, Kyriakos C. y Wendy L. Queen. "Recent Advances in Carbon Capture with Metal–Organic Frameworks". CHIMIA International Journal for Chemistry 69, n.º 5 (27 de mayo de 2015): 274–83. http://dx.doi.org/10.2533/chimia.2015.274.

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30

Mishra, Ratan K., Martin Weibel, Thomas Müller, Hendrik Heinz y Robert J. Flatt. "Energy-effective Grinding of Inorganic Solids Using Organic Additives". CHIMIA International Journal for Chemistry 71, n.º 7 (9 de agosto de 2017): 451–60. http://dx.doi.org/10.2533/chimia.2017.451.

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31

Reimann, Stefan, Martin K. Vollmer, Matthias Hill, Paul Schlauri, Myriam Guillevic, Dominik Brunner, Stephan Henne, Dominique Rust y Lukas Emmenegger. "Long-term Observations of Atmospheric Halogenated Organic Trace Gases". CHIMIA International Journal for Chemistry 74, n.º 3 (25 de marzo de 2020): 136–41. http://dx.doi.org/10.2533/chimia.2020.136.

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CFCs (chlorofluorocarbons) and other strong ozone-depleting halogenated organic trace gases were used in numerous industrial, household and agriculture applications. First atmospheric measurements of CFCs were performed in the 1970s, well ahead of the detection of the ozone hole in the 1980s. The continuous observation of these ozone-depleting substances (ODSs) is crucial for monitoring their global ban within the Montreal Protocol. In addition, also HFCs (fluorinated hydrocarbons) are measured, which were introduced as substitutes of ODSs and are potent greenhouse gases. Since 2000, Empa continuously measures more than 50 halogenated trace gases at the high-Alpine station of Jungfraujoch (3850 m asl) as part of the global AGAGE network (Advanced Global Atmospheric Gases Experiment). Jungfraujoch is the highest location worldwide where such measurements are performed, and the site where several of these compounds were measured in the atmosphere for the first time. The measurements at Jungfraujoch and at other globally well-positioned sites serve as an early warning system, i. e. before potentially harmful halogenated organic substances can accumulate and detrimentally affect the natural environment.

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32

Stieger, Bruno. "Transporters for Bile Formation in Physiology and Pathophysiology". CHIMIA 76, n.º 12 (21 de diciembre de 2022): 1025. http://dx.doi.org/10.2533/chimia.2022.1025.

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The liver fulfills many vital functions for the body, among them bile formation and detoxification. Bile salts are organic anions, are the major constituents of bile and are at high concentrations cytotoxic. Detoxification exposes the liver to many harmful compounds. This function is therefore potentially damaging to the liver. Impaired bile formation may lead to hepatic accumulation of bile salts and subsequently to liver disease. Diagnosis of liver diseases involves the measurement of so-called liver function parameters. This overview aims to characterize and summarize the role of organic anion transporters in bile formation at the protein level under normal physiologic conditions and in liver function tests used for diagnosing liver diseases in pathophysiologic situations.

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33

Zollinger, Heinrich. "Color Chemistry as Reflected in Helvetica Chimica Acta". Helvetica Chimica Acta 75, n.º 6 (2 de octubre de 1992): 1727–54. http://dx.doi.org/10.1002/hlca.19920750602.

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34

Milić, Jovana V. "Supramolecular Engineering of Hybrid Materials in Photovoltaics and Beyond". CHIMIA 76, n.º 9 (21 de septiembre de 2022): 784. http://dx.doi.org/10.2533/chimia.2022.784.

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Solar-to-electric energy conversion has provided one of the most powerful renewable energy technologies. In particular, hybrid organic-inorganic halide perovskites have recently emerged as leading thin-film semiconductors for new generation photovoltaics. However, their instability under operating conditions remains an obstacle to their application. To address this, we relied on supramolecular engineering in the development of organic systems that can interact with the surface of hybrid perovskites through different noncovalent interactions and enhance their operational stabilities. Moreover, we have utilized the uniquely soft yet crystalline structure of hybrid perovskites and their mixed ionic-electronic conductivity to provide a platform for advancing their functionality beyond photovoltaics. This account reviews our recent progress in supramolecular engineering of hybrid perovskites in photovoltaics and discusses their perspectives in the development of smart technologies.

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35

Sekar, Arvindh y Kevin Sivula. "Organic Semiconductors as Photoanodes for Solar-driven Photoelectrochemical Fuel Production". CHIMIA International Journal for Chemistry 75, n.º 3 (31 de marzo de 2021): 169–79. http://dx.doi.org/10.2533/chimia.2021.169.

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The direct conversion of solar energy into chemical fuels, such as hydrogen, via photoelectrochemical (PEC) water splitting requires the efficient oxidation of water at a photoanode. While transition metal oxides have shown a significant success as photoanodes, their intrinsic limitations make them the bottleneck of PEC water splitting. Recently, initial research reports suggest that organic semiconductors (OSCs) could be possible alternative photoanode materials in both dye-sensitized and thin film photoelectrode configurations. Herein we review the progress to date, with a focus on the major issues faced by OSCs: stability and low photocurrent density in aqueous photoelectrochemical conditions. An outlook to the future of OSCs in photoelectrochemistry is also given.

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36

Canonica, Silvio. "Oxidation of Aquatic Organic Contaminants Induced by Excited Triplet States". CHIMIA International Journal for Chemistry 61, n.º 10 (24 de octubre de 2007): 641–44. http://dx.doi.org/10.2533/chimia.2007.641.

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37

Snowden, RogerL. "Thirty-three Years of Synthetic Organic Chemistry in Geneva: Reminiscences". CHIMIA International Journal for Chemistry 63, n.º 12 (1 de diciembre de 2009): 855–57. http://dx.doi.org/10.2533/chimia.2009.855.

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38

Sureshkumar, Devarajulu, Purushothaman Gopinath y Srinivasan Chandrasekaran. "Tetraethylammonium Tetraselenotungstate: A Versatile Selenium Transfer Reagent in Organic Synthesis". CHIMIA International Journal for Chemistry 66, n.º 12 (19 de diciembre de 2012): 921–29. http://dx.doi.org/10.2533/chimia.2012.921.

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39

Banerji, Natalie. "Structure–Property Relations in Polymer:Fullerene Blends for Organic Solar Cells". CHIMIA International Journal for Chemistry 70, n.º 7 (24 de agosto de 2016): 512–17. http://dx.doi.org/10.2533/chimia.2016.512.

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40

Santi, Claudio, Cristina Tomassini y Luca Sancineto. "Organic Diselenides: Versatile Reagents, Precursors, and Intriguing Biologically Active Compounds". CHIMIA International Journal for Chemistry 71, n.º 9 (27 de septiembre de 2017): 592–95. http://dx.doi.org/10.2533/chimia.2017.592.

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41

Jaun, Bernhard y Carlo Thilgen. "Challenges in Creating Online Exercises and Exams in Organic Chemistry". CHIMIA International Journal for Chemistry 72, n.º 1 (1 de febrero de 2018): 48–54. http://dx.doi.org/10.2533/chimia.2018.48.

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42

Matile, Stefan. "Organic Chemistry for First Year Medical Students: Addressing the 'Grand Public'". CHIMIA International Journal for Chemistry 75, n.º 1 (28 de febrero de 2021): 27–32. http://dx.doi.org/10.2533/chimia.2021.27.

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Experiences from 20 years of teaching organic chemistry at the Medical School of the University of Geneva are recollected. Emphasis is on the question how to address a large audience without particular passion for chemistry. The key lesson learned is to offer a substantial justification for every topic right at the beginning, before the basics are covered. For instance, the course opens with vancomycin resistance, achieved by changing one functional group, even one atom into another, and introductory topics are then developed literally on the structure of a beautifully complex natural product (relation of molecules, functional groups and atoms, introduction of functional groups, the octet rule, hybridization, later on also peptide chemistry, stereochemistry, etc.). Tamiflu is launched right afterwards as a possible justification why medical students should learn reaction mechanisms, long before the concerned reaction, the transformation of an acetal into a hemiacetal, is discussed. Not all classical teaching topics are compatible with such ' relevance-triggered teaching ' (nomenclature certainly not, nor halogenoalkanes, aromatic substitutions, alkynes, most of alkenes, spectroscopy, etc.). Other topics deserve more attention, like the more complex cyclic structures of sugars and steroids in the structural part and carbonyl chemistry, including catalysis, as the center of the reactivity part of the course. Difficult to measure, such ' relevance-triggered ' course restructuring, inconceivable from a classical educational point of view, has been overall surprisingly well received, although definitely not by all students.

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43

Bode, Jeffrey W. "Organic Synthesis without Stoichiometric Reagents: A Guiding Principle for Reaction Development". CHIMIA International Journal for Chemistry 65, n.º 3 (30 de marzo de 2011): 150–56. http://dx.doi.org/10.2533/chimia.2011.150.

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44

Wenger, Oliver S. "Photoinduced Electron and Proton Transfer with Metal Complexes and Organic Molecules". CHIMIA International Journal for Chemistry 67, n.º 5 (29 de mayo de 2013): 337–39. http://dx.doi.org/10.2533/chimia.2013.337.

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45

Barylyuk, Konstantin, Vladimir Frankevich, Alfredo J. Ibáñez, Pablo Martinez-Lozano Sinues y Renato Zenobi. "Mass Spectrometry Research at the Laboratory for Organic Chemistry, ETH Zurich". CHIMIA International Journal for Chemistry 68, n.º 3 (26 de marzo de 2014): 119–23. http://dx.doi.org/10.2533/chimia.2014.119.

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46

Rickhaus, Michel, Lukas Jundt y Marcel Mayor. "Determining Inversion Barriers in Atrop- isomers – A Tutorial for Organic Chemists". CHIMIA International Journal for Chemistry 70, n.º 3 (30 de marzo de 2016): 192–202. http://dx.doi.org/10.2533/chimia.2016.192.

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47

Weesepoel, Yannick, Samuel Heenan, Rita Boerrigter-Eenling, Tjerk Venderink, Marco Blokland y Saskia van Ruth. "Protocatechuic Acid Levels Discriminate Between Organic and Conventional Wheat from Denmark". CHIMIA International Journal for Chemistry 70, n.º 5 (25 de mayo de 2016): 360–63. http://dx.doi.org/10.2533/chimia.2016.360.

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48

HEIMGARTNER, H. y H. J. HANSEN. "ChemInform Abstract: Structure and Mechanism in Organic Chemistry in the Mirror of Helvetica Chimica Acta". ChemInform 23, n.º 26 (21 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199226315.

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49

Dhankhar, Jyoti y Ilija Čorić. "Direct C–H Arylation". CHIMIA 76, n.º 9 (21 de septiembre de 2022): 777. http://dx.doi.org/10.2533/chimia.2022.777.

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Bonds between hydrogen and carbon atoms are the most frequent type of bonds in organic molecules. The ability to replace hydrogen atoms by making other types of bonds to carbon atoms can enable simpler access to complex organic molecules by substituting multistep synthetic sequences. The use of transition metal catalysts to activate C–H bonds is particularly attractive as it offers control over the reactivity and selectivity through catalyst design. However, such functionalization includes the difficult breaking of strong C–H bonds that are not activated by the presence of other groups. Additionally, the common presence of a number of C–H bonds in a molecule raises the issue of site-selectivity because differentiation of C–H bonds that are in sterically and electronically similar environments is a challenge. We discuss selected recent developments that are a part of the long-term research interest in mild and selective C–H activation reactions with a focus on the replacement of C–H bonds with C–aryl groups and an emphasis on the work of our group.

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50

Nüesch, Frank A. "Interface Dipoles for Tuning Energy Level Alignment in Organic Thin Film Devices". CHIMIA International Journal for Chemistry 67, n.º 11 (27 de noviembre de 2013): 796–803. http://dx.doi.org/10.2533/chimia.2013.796.

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Artículos de revistas sobre el tema "CHIMICA ORGANICA"

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