Results 71 to 80 of about 43,175 (307)

Zn Mediated Regioselective Barbier Reaction of Propargylic Bromides in THF/aq. NH4Cl Solution

Molecules, 2001
The reaction of substituted and unsubstituted propargylic bromides with butanal in presence of zinc power in THF/saturated aqueous NH4Cl solution gave corresponding allenic and propargylic alcohols with high selectivity.
Uno Mäeorg, Artur Jõgi
doaj   +1 more source

2-Nitroanilinium bromide [PDF]

Acta Crystallographica Section E Structure Reports Online, 2011
The title compound, C(6)H(7)N(2)O(2) (+)·Br(-), is isomorphous with 2-nitro-anilinium chloride and contains an characteristic intra-molecular N-H⋯O hydrogen bond, forming an S(6) motif. Inter-molecular N-H⋯Br hydrogen bonds occur in the crystal structure. Two zigzag chains of C(2) (1)(4) motifs extend along the b-axis direction.
R. Anitha, S. Athimoolam, S. Asath Bahadur, M. Gunasekaran   +3 more
openaire   +3 more sources

MnI‐Functionalized Covalent Organic Framework as Efficient Electrocatalyst for CO2 Reduction in a Catholyte‐Free Zero‐Gap Electrolyzer

Advanced Functional Materials, EarlyView.
This work demonstrates the successful integration of a phenanthroline‐based 2D COF with MnI catalytic sites into a catholyte‐free membrane‐electrode‐assembly cell for CO2 electroreduction. The crystalline COF actively suppresses Mn⁰–Mn⁰ dimerization, achieving a turnover frequency of 617 h⁻¹ at 2.8 V (full‐cell potential), and enabling stable operation.
Laura Spies, Marcos Eduardo G. Carmo, Gonçalves J. Marrenjo, Stephan Reuther, Patrick Ganswindt, Antonio Otavio T. Patrocinio, Thomas Bein, Osmando F. Lopes, Jenny Schneider   +8 more
wiley   +1 more source

Direct Introduction of a Dimesitylboryl Group Using Base-Mediated Substitution of Aryl Halides with Silyldimesitylborane [PDF]

, 2016
The first dimesitylboryl substitution of aryl halides with a silylborane bearing a dimesitylboryl group in the presence of alkali-metal alkoxides is described.
Albrecht, Barluenga, Baron, Bonet, Bonnefon, Bose, Bose, Brown, Brown, Carlos Araujo Da Silva, Charlot, Cheng, Cheung, Cho, Del Grosso, Dewar, Dombray, Doty, Entwistle, Entwistle, Fürstner, Genaev, Gilman, Gu, Hall, Iida, Ishiyama, Ishiyama, Jia, Kaim, Kleeberg, Kleeberg, Liu, Liu, Liu, Légaré, Mazzacano, Menzel, Miyata, Mo, Morgan, Muetterties, Murata, Nagashima, Niu, Noda, Obligacion, Oestreich, Ohmura, Pintaric, Rosen, Segawa, Shimada, Uematsu, Wade, Wang, Wang, Weber, Yamaguchi, Yamaguchi, Yamamoto, Yamamoto, Yuan, Yuan, Yuan, Yuan, Zhao, Zhao, Zhu   +68 more
core   +1 more source

Biodegradable and Recyclable Luminescent Mixed‐Matrix‐Membranes, Hydrogels, and Cryogels based on Nanoscale Metal‐Organic Frameworks and Biopolymers

Advanced Functional Materials, EarlyView.
The study presents biodegradable and recyclable mixed‐matrix membranes (MMMs), hydrogels, and cryogels using luminescent nanoscale metal‐organic frameworks (nMOFs) and biopolymers. These bio‐nMOF‐MMMs combine europium‐based nMOFs as probes for the status of the materials with the biopolymers agar and gelatine and present alternatives to conventional ...
Moritz Maxeiner, Julian Burkhart, Kateryna Borysova, Chiara Mazzariol, Klaus Müller‐Buschbaum   +4 more
wiley   +1 more source

Oxidative monobromination of electron-​rich arenes by concentrate H2SO4​/alkali metal bromides [PDF]

, 2004
The reaction of electron-​rich arenes with alkali metal bromides such as sodium and potassium bromides in the presence of conc. H2SO4 to give p-​bromoarenes is reported. The reaction is possible in the absence of any specialized oxidizing agents and the
Myint Yi Yi, ., Pasha, M.A.
core   +1 more source

Palladium-catalysed cross-coupling reaction of ultra-stabilised 2-aryl-1,3-dihydro-1H-benzo[d]1,3,2-diazaborole compounds with aryl bromides: A direct protocol for the preparation of unsymmetrical biaryls

Beilstein Journal of Organic Chemistry, 2014
There has been a significant interest in organoboron compounds such as arylboronic acids, arylboronate esters and potassium aryltrifluoroborate salts because they are versatile coupling partners in metal-catalysed cross-coupling reactions.
Siphamandla Sithebe, Ross S. Robinson
doaj   +1 more source

Highly Sensitive Electrochemical Biosensor Based on Hairy Particles with Controllable High Enzyme Loading and Activity

Advanced Functional Materials, EarlyView.
For the first time, a highly sensitive electrochemical biosensor based on SiO2‐based hairy particles with a grafted PDMAEMA polymer brush containing a quantifiable and large amount of immobilized Laccase is reported. The fabricated biosensor exhibits a sensitivity of 0.14 A·m⁻¹, a limit of detection (LOD) of 0.1 µm, and a detection range of 0.3–750 µm,
Pavel Milkin, Anila Antony, Hongtao Cai, Antonia Debevc, Ceyda Topal, Anne Linhardt, Alla Synytska, Leonid Ionov   +7 more
wiley   +1 more source

Synthesis and Diels-Alder Reactions of 1,2-Dimethylene- and 1,2,9,10-Tetramethylene-[2.2]paracyclophane: New Routes to Bridge-Anellated[2.2]Paracyclophanedienes [PDF]

, 1992
The title compounds 8 and 1 have been synthesized in three steps each from 1,2-dibromo[2.2]paracyclophan-1-ene (2) and 1,2,9,10-tetrabromo[2.2]paracyclophane-1,9-diene (4), respectively. Copper-mediated coupling of vinyl bromides 2 and 4 with methyl- and
Bailey, Beletskaya, Blatter, Blatter, Cava, Chan, Dalton, de Meijere, de Meijere, GröUtzmacher, Hopf, Hopf, Jenekhe, Keehn, Kohnke, KöUnig, Pollmann, Posner, Reiser, Sato, Scharf, SchlöUter, Stoddart, Stoddart, Stoddart, VöUgtle, Wagner, Wegner, Wong   +28 more
core   +2 more sources

Copper-promoted C5-selective bromination of 8-aminoquinoline amides with alkyl bromides

Beilstein Journal of Organic Chemistry
An efficient and practical method for the synthesis of C5-brominated 8-aminoquinoline amides via a copper-promoted selective bromination of 8-aminoquinoline amides with alkyl bromides was developed.
Changdong Shao, Chen Ma, Li Li, Jingyi Liu, Yanan Shen, Chen Chen, Qionglin Yang, Tianyi Xu, Zhengsong Hu, Yuhe Kan, Tingting Zhang   +10 more
doaj   +1 more source