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47 Aktuelle Fachpublikationen zum Thema temperature

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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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Simple and rapid hydrogenation of p-nitrophenol with aqueous formic acid in catalytic flow reactors

14.06.2013 | Rahat Javaid, Shin-ichiro Kawasaki, Akira Suzuki and Toshishige M. Suzuki, Beilstein Journal of Organic Chemistry, 2013

Abstract The inner surface of a metallic tube (i.d. 0.5 mm) was coated with a palladium (Pd)-based thin metallic layer by flow electroless plating. Simultaneous plating of Pd and silver (Ag) from their electroless-plating solution produced a mixed distributed bimetallic layer. Preferential acid ...

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Substituent effect on the energy barrier for σ-bond formation from π-single-bonded species, singlet 2,2-dialkoxycyclopentane-1,3-diyls

14.05.2013 | Jianhuai Ye, Yoshihisa Fujiwara and Manabu Abe, Beilstein Journal of Organic Chemistry, 2013

Abstract Background: Localized singlet diradicals are in general quite short-lived intermediates in processes involving homolytic bond-cleavage and formation reactions. In the past decade, long-lived singlet diradicals have been reported in cyclic systems such as cyclobutane-1,3-diyls and ...

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Ring-opening reaction of 2,5-dioctyldithieno[2,3-b:3',2'-d]thiophene in the presence of aryllithium reagents

19.04.2013 | Hao Zhong, Jianwu Shi, Jianxun Kang, Shaomin Wang, Xinming Liu and Hua Wang, Beilstein Journal of Organic Chemistry, 2013

Abstract In this paper, the ring-opening reaction of 2,5-dioctyldithieno[2,3-b:3',2'-d]thiophene with aryllithium in THF at low temperature to generate 2'-arylthio-3,3'-bithiophene-2-carbaldehydes is studied. Nine examples are explored and all the products are characterized by 1H NMR, 13C NMR ...

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Reductions of aldehydes and ketones with a readily available N-heterocyclic carbene borane and acetic acid

08.04.2013 | Vladimir Lamm, Xiangcheng Pan, Tsuyoshi Taniguchi and Dennis P. Curran, Beilstein Journal of Organic Chemistry, 2013

Abstract Acetic acid promotes the reduction of aldehydes and ketones by the readily available N-heterocyclic carbene borane, 1,3-dimethylimidazol-2-ylidene borane. Aldehydes are reduced over 1–24 h at room temperature with 1 equiv of acetic acid and 0.5 equiv of the NHC-borane. Ketone ...

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Synthesis and stability study of a new major metabolite of γ-hydroxybutyric acid

02.04.2013 | Ida Nymann Petersen, Jesper Langgaard Kristensen, Christian Tortzen, Torben Breindahl and Daniel Sejer Pedersen, Beilstein Journal of Organic Chemistry, 2013

Abstract γ-Hydroxybutanoic acid (GHB) is used as a date-rape drug, which renders the victims unconscious and defenceless. Intoxications are very difficult to detect for forensic scientists due to rapid metabolism to endogenous levels of GHB. We recently discovered a new major metabolite, 2, of ...

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