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42 Aktuelle Fachpublikationen zum Thema temperature
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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 ...
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 ...
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 ...
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 ...
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, ...
Intramolecular carbolithiation cascades as a route to a highly strained carbocyclic framework: competition between 5-exo-trig ring closure and proton transfer
14.03.2013 | William F. Bailey and Justin D. Fair, Beilstein Journal of Organic Chemistry, 2013
Abstract The preparation of fairly strained carbocyclic ring systems by intramolecular 5-exo-trig ring closure has been well documented, and the absence of proton transfers that would compromise such cyclizations is a hallmark of this chemistry. In an effort to explore the limitations of ...
Alkyne hydroarylation with Au N-heterocyclic carbene catalysts
05.02.2013 | Cristina Tubaro, Marco Baron, Andrea Biffis and Marino Basato, Beilstein Journal of Organic Chemistry, 2013
Abstract Mono- and dinuclear gold complexes with N-heterocyclic carbene (NHC) ligands have been employed as catalysts in the intermolecular hydroarylation of alkynes with simple unfunctionalised arenes. Both mono- and dinuclear gold(III) complexes were able to catalyze the reaction; ...
Removal of benzylidene acetal and benzyl ether in carbohydrate derivatives using triethylsilane and Pd/C
14.01.2013 | Abhishek Santra, Tamashree Ghosh and Anup Kumar Misra, Beilstein Journal of Organic Chemistry, 2013
Abstract Clean deprotection of carbohydrate derivatives containing benzylidene acetals and benzyl ethers was achieved under catalytic transfer hydrogenation conditions by using a combination of triethylsilane and 10% Pd/C in CH3OH at room temperature. A variety of carbohydrate diol ...
Synthesis of spiro[dihydropyridine-oxindoles] via three-component reaction of arylamine, isatin and cyclopentane-1,3-dione
03.01.2013 | Yan Sun, Jing Sun and Chao-Guo Yan, Beilstein Journal of Organic Chemistry, 2013
Abstract A fast and convenient protocol for the synthesis of novel spiro[dihydropyridine-oxindole] derivatives in satisfactory yields was developed by the three-component reactions of arylamine, isatin and cyclopentane-1,3-dione in acetic acid at room temperature. On the other hand the ...
Preparation of mixed trialkyl alkylcarbonate derivatives of etidronic acid via an unusual route
20.11.2012 | Petri A. Turhanen, Janne Weisell and Jouko J. Vepsäläinen, Beilstein Journal of Organic Chemistry, 2012
Abstract A method to prepare four (3a–d) trialkyl alkylcarbonate esters of etidronate from P,P'-dimethyl etidronate and alkyl chloroformate was developed by utilizing unexpected demethylation and decarboxylation reactions. The reaction with the sterically more hindered isobutyl ...
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