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60 Aktuelle Fachpublikationen zum Thema temperature

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Diradical reaction mechanisms in [3 + 2]-cycloadditions of hetaryl thioketones with alkyl- or trimethylsilyl-substituted diazomethanes

14.04.2016 | Grzegorz Mlostoń, Paulina Pipiak and Heinz Heimgartner, Beilstein Journal of Organic Chemistry, 2016

Abstract Reactions of dihetaryl and aryl/hetaryl thioketones with 2-diazopropane, diazoethane, and (trimethylsilyl)diazomethane were studied at variable temperature. The experiments showed that reactions with 2-diazopropane carried out at –75 °C occur mainly via the initially formed, relatively ...


Supramolecular structures based on regioisomers of cinnamyl-α-cyclodextrins – new media for capillary separation techniques

19.01.2016 | Gabor Benkovics, Ondrej Hodek, Martina Havlikova, Zuzana Bosakova, Pavel Coufal, Milo Malanga, Eva Fenyvesi, Andras ..., Beilstein Journal of Organic Chemistry, 2016

Abstract This work focuses on the preparation and application of supramolecular structures based on mono-cinnamyl-α-cyclodextrins (Cin-α-CD). Pure regioisomers of Cin-α-CD having the cinnamyl moiety at the 2-O- or at the 3-O-position, respectively, were prepared, characterized and applied in ...


Carbon–carbon bond cleavage for Cu-mediated aromatic trifluoromethylations and pentafluoroethylations

18.12.2015 | Tsuyuka Sugiishi, Hideki Amii, Kohsuke Aikawa and Koichi Mikami, Beilstein Journal of Organic Chemistry, 2015

Abstract This short review highlights the copper-mediated fluoroalkylation using perfluoroalkylated carboxylic acid derivatives. Carbon–carbon bond cleavage of perfluoroalkylated carboxylic acid derivatives takes place in fluoroalkylation reactions at high temperature (150–200 °C) or under ...


Conformational equilibrium in supramolecular chemistry: Dibutyltriuret case

05.11.2015 | Karina Mroczyńska, Małgorzata Kaczorowska, Erkki Kolehmainen, Ireneusz Grubecki, Marek Pietrzak and Borys Ośmiałowski, Beilstein Journal of Organic Chemistry, 2015

Abstract The association of substituted benzoates and naphthyridine dianions was used to study the complexation of dibutyltriuret. The title molecule is the simplest molecule able to form two intramolecular hydrogen bonds. The naphthyridine salt was used to break two intramolecular hydrogen ...


Investigation on the reactivity of α-azidochalcones with carboxylic acids: Formation of α-amido-1,3-diketones and highly substituted 2-(trifluoromethyl)oxazoles

29.10.2015 | Kandasamy Rajaguru, Arumugam Mariappan, Rajendran Suresh, Periasamy Manivannan and Shanmugam Muthusubramanian, Beilstein Journal of Organic Chemistry, 2015

Abstract The reaction of α-azidochalcones with carboxylic acids has been investigated resulting in the formation of α-amido-1,3-diketones under microwave irradiation via in situ formation of 2H-azirine intermediates. An interesting reaction is described wherein, with trifluoroacetic acid at ...


Hexacoordinate Ru-based olefin metathesis catalysts with pH-responsive N-heterocyclic carbene (NHC) and N-donor ligands for ROMP reactions in non-aqueous, aqueous and emulsion conditions

21.10.2015 | Shawna L. Balof, K. Owen Nix, Matthew S. Olliff, Sarah E. Roessler, Arpita Saha, Kevin B. Müller, Ulrich Behrens, Ed ..., Beilstein Journal of Organic Chemistry, 2015

Abstract Three new ruthenium alkylidene complexes (PCy3)Cl2(H2ITap)Ru=CHSPh (9), (DMAP)2Cl2(H2ITap)Ru=CHPh (11) and (DMAP)2Cl2(H2ITap)Ru=CHSPh (12) have been synthesized bearing the pH-responsive H2ITap ligand (H2ITap = ...


Synthesis of racemic and chiral BEDT-TTF derivatives possessing hydroxy groups and their achiral and chiral charge transfer complexes

08.09.2015 | Sara J. Krivickas, Chiho Hashimoto, Junya Yoshida, Akira Ueda, Kazuyuki Takahashi, John D. Wallis and Hatsumi Mori, Beilstein Journal of Organic Chemistry, 2015

Abstract Chiral molecular crystals built up by chiral molecules without inversion centers have attracted much interest owing to their versatile functionalities related to optical, magnetic, and electrical properties. However, there is a difficulty in chiral crystal growth due to the lack of ...


The chemical behavior of terminally tert-butylated polyolefins

24.07.2015 | Dagmar Klein, Henning Hopf, Peter G. Jones, Ina Dix and Ralf Hänel, Beilstein Journal of Organic Chemistry, 2015

Abstract The chemical behavior of various oligoenes 2 has been studied. The catalytic hydrogenation of diene 3 yielded monoene 4. Triene 7 was hydrogenated to diene 8, monoene 9 and saturated hydrocarbon 10. Bromine addition to 3 and 7 yielded the dibromides 17 and 18, respectively, i.e., the ...


Copper ion salts of arylthiotetrathiafulvalenes: synthesis, structure diversity and magnetic properties

20.05.2015 | Longfei Ma, Jibin Sun, Xiaofeng Lu, Shangxi Zhang, Hui Qi, Lei Liu, Yongliang Shao and Xiangfeng Shao, Beilstein Journal of Organic Chemistry, 2015

Abstract The combination of CuBr2 and arylthio-substituted tetrathiafulvalene derivatives (1–7) results in a series of charge-transfer (CT) complexes. Crystallographic studies indicate that the anions in the complexes, which are derived from CuBr2, show diverse configurations including linear ...


Hetero-Diels–Alder reactions of hetaryl and aryl thioketones with acetylenic dienophiles

28.04.2015 | Grzegorz Mlostoń, Paulina Grzelak, Maciej Mikina, Anthony Linden and Heinz Heimgartner, Beilstein Journal of Organic Chemistry, 2015

Abstract Selected hetaryl and aryl thioketones react with acetylenecarboxylates under thermal conditions in the presence of LiClO4 or, alternatively, under high-pressure conditions (5 kbar) at room temperature yielding thiopyran derivatives. The hetero-Diels–Alder reaction occurs in a chemo- ...


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