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52 Aktuelle Fachpublikationen zum Thema temperature

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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 ...

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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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Modification of physical properties of poly(L-lactic acid) by addition of methyl-β-cyclodextrin

16.12.2014 | Toshiyuki Suzuki, Ayaka Ei, Yoshihisa Takada, Hiroki Uehara, Takeshi Yamanobe and Keiko Takahashi, Beilstein Journal of Organic Chemistry, 2014

Abstract Poly(L-lactic acid) (PLLA) is a biodegradable plastic and one of the most famous plastics made from biobased materials. However, its physical strength is insufficient compared to general-purpose plastics. In this study, the effect of methylcyclodextrin (MeCD) addition on the structure ...

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Thermal and oxidative stability of the Ocimum basilicum L. essential oil/β-cyclodextrin supramolecular system

28.11.2014 | Daniel I. Hădărugă, Nicoleta G. Hădărugă, Corina I. Costescu, Ioan David and Alexandra T. Gruia, Beilstein Journal of Organic Chemistry, 2014

Abstract Ocimum basilicum L. essential oil and its β-cyclodextrin (β-CD) complex have been investigated with respect to their stability against the degradative action of air/oxygen and temperature. This supramolecular system was obtained by a crystallization method in order to achieve the ...

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Aspergiloid I, an unprecedented spirolactone norditerpenoid from the plant-derived endophytic fungus Aspergillus sp. YXf3

17.11.2014 | Zhi Kai Guo, Rong Wang, Wei Huang, Xiao Nian Li, Rong Jiang, Ren Xiang Tan and Hui Ming Ge, Beilstein Journal of Organic Chemistry, 2014

Abstract An unusual C18 norditerpenoid, aspergiloid I (1), was isolated from the culture broth of Aspergillus sp. YXf3, an endophytic fungus derived from Ginkgo biloba. Its structure was unambiguously established by analysis of HRMS–ESI and spectroscopic data, and the absolute configuration was ...

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New highlights of the syntheses of pyrrolo[1,2-a]quinoxalin-4-ones

14.10.2014 | Emilian Georgescu, Alina Nicolescu, Florentina Georgescu, Florina Teodorescu, Daniela Marinescu, Ana-Maria Macsim an ..., Beilstein Journal of Organic Chemistry, 2014

Abstract The one-pot three-component reactions of 1-substituted benzimidazoles with ethyl bromoacetate and electron-deficient alkynes, in 1,2-epoxybutane, gave a variety of pyrrolo[1,2-a]quinoxalin-4-ones and pyrrolo[1,2-a]benzimidazoles. The influence of experimental conditions on the course ...

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Flow Giese reaction using cyanoborohydride as a radical mediator

03.09.2013 | Takahide Fukuyama, Takuji Kawamoto, Mikako Kobayashi and Ilhyong Ryu, Beilstein Journal of Organic Chemistry, 2013

Abstract Tin-free Giese reactions, employing primary, secondary, and tertiary alkyl iodides as radical precursors, ethyl acrylate as a radical trap, and sodium cyanoborohydride as a radical mediator, were examined in a continuous flow system. With the use of an automated flow microreactor, flow ...

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Efficient continuous-flow synthesis of novel 1,2,3-triazole-substituted β-aminocyclohexanecarboxylic acid derivatives with gram-scale production

29.07.2013 | Sándor B. Ötvös, Ádám Georgiádes, István M. Mándity, Lóránd Kiss and Ferenc Fülöp, Beilstein Journal of Organic Chemistry, 2013

Abstract The preparation of novel multi-substituted 1,2,3-triazole-modified β-aminocyclohexanecarboxylic acid derivatives in a simple and efficient continuous-flow procedure is reported. The 1,3-dipolar cycloaddition reactions were performed with copper powder as a readily accessible Cu(I) ...

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Dipolar addition to cyclic vinyl sulfones leading to dual conformation tricycles

15.07.2013 | Steven S. Y. Wong, Michael G. Brant, Christopher Barr, Allen G. Oliver and Jeremy E. Wulff, Beilstein Journal of Organic Chemistry, 2013

Abstract Dipolar addition of cyclic azomethine imines with cyclic vinyl sulfones gave rise to functionalized tricycles that exhibited fluxional behavior in solution at room temperature. The scope of the synthetic methodology was explored, and the origin of the fluxional behavior was probed by ...

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α-Bromodiazoacetamides – a new class of diazo compounds for catalyst-free, ambient temperature intramolecular C–H insertion reactions

11.07.2013 | Åsmund Kaupang and Tore Bonge-Hansen, Beilstein Journal of Organic Chemistry, 2013

Abstract In this work, we introduce a new class of halodiazocarbonyl compounds, α-halodiazoacetamides, which through a metal-free, ambient-temperature thermolysis perform intramolecular C–H insertions to produce α-halo-β-lactams. When carried out with α-bromodiazoacetamides bearing cyclic side ...

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