Results 131 to 140 of about 104,664 (293)

Gold‐Einzelatomkatalysatoren ermöglichen die selektive Shuttle‐Hydrochlorierung von Alkinen

Angewandte Chemie, EarlyView.
Gold‐Einzelatomkatalysatoren auf Aktivkohle ermöglichen dank des Zusammenwirkens zwischen Au(I)‐Zentren und dem Träger die heterogene Shuttle‐Hydrochlorierung von terminalen Alkinen zu Vinylchloriden mit hoher Chemo‐ und Stereoselektivität. Das katalytische System vereint breite Substratverträglichkeit, vereinfachte Abtrennung und Wiederverwertbarkeit ...
Marc‐Eduard Usteri, Eva J. Meeus, Christian Zachau, Seung‐Eun Choi, Aram Bugaev, Milivoj Plodinec, Sharon Mitchell, Bill Morandi, Javier Pérez‐Ramírez   +8 more
wiley   +1 more source

Cobalt‐Catalyzed [2σ+2π] Cycloaddition via Site‐Selective Capture of Bicyclobutane Diradical

Angewandte Chemie, EarlyView.
We report a Co(II)‐catalyzed strategy that combines thermal activation of bicyclo[1.1.0]butane (BCBs) with site‐selective radical capture to furnish head‐to‐head fused bicyclo[2.1.1]hexanes via [2σ+2π] cycloaddition with indoles. Detailed mechanistic studies (31P NMR, EPR, CV, and DFT) support the catalytic pathway, while phosphine‐oxide trapping and X‐
Tanmayee Nanda, Alexander Umanzor, Julia Gartzke, Jeremy T. Maddigan‐Wyatt, Philipp Thielert, Stefan Weber, Sabine Richert, Shuming Chen, Daniel B. Werz   +8 more
wiley   +2 more sources

Deuterium Labelling of L-Tyrosine with Raney Alloys in Alkaline Deuterium Oxide Solutions

, 1997
The synthesis of deuteriated L-tyrosines with Raney alloys in alkaline deuterium oxide solutions, involving reductive debromination of brominated L-tyrosines and hydrogen-deuterium (H-D) exchange of L-tyrosines, without causing racemization, is ...
宇田川, 潤, Tsuzuki, Hirohisa, Mataka, Shuntaro, 又賀, 駿太郎, Tashiro, Masashi, 田代, 昌士, Mukumoto, Mamoru, 都築, 廣久, Udagawa, Jun   +8 more
core  

A study of beam ion and deuterium–deuterium fusion-born triton transports due to energetic particle-driven magnetohydrodynamic instability in the large helical device deuterium plasmas [PDF]

0000-0003-4555-1837Understanding energetic particle transport due to magnetohydrodynamic instabilities excited by energetic particles is essential to apprehend alpha particle confinement in a fusion burning plasma. In the large helical device (LHD), beam
TAKADA, Eiji, JO, J., SANGAROON, Siriyaporn, YAMAGUCHI, Hiroyuki, FUJIWARA, Yutaka, NUGA, Hideo, KOBAYASHI, Makoto, SEKI, Ryosuke, OSAKABE, Masaki, KAMIO, Shuji, MURAKAMI, Sadayoshi, OGAWA, Kunihiro, ISOBE, Mitsutaka   +12 more
core  

Neutron Production Analysis on Inertial Electrostatic Deuterium-Deuterium Fusion [PDF]

, 2009
The basic principle of fusion is combining two light nuclei to form one nucleus that is lighter than the combination of the original two. This loss of mass is converted into energy (E=mc2 ) which can be harnessed for various applications. Fusion can take
Franzel, Louis
core  

Aggravated blistering and increased deuterium retention in iron-damaged tungsten after exposure to deuterium plasma with various surface temperatures

, 2018
Effects of iron ion pre-irradiation with energy of 1 MeV on deuterium retention and blistering in tungsten has been investigated after exposure to low-energy (40 eV) and high flux (~1022 D m−2 s−1) deuterium plasma under high fluence of 1  ×  1026 D m−2 ...
Linsmeier, Christian, Lu, Guang-Hong, Shi, Li-Qun, Zhu, Xiu-Li, Kreter, Arkadi, Zhang, Ying, Cheng, Long, Yuan, Yue   +7 more
core   +1 more source

Eine Sesterterpensynthase für Tibonen und ein Cytochrom P450 für Dessen Oxidation zu Tibonon aus Streptomyces sp. YIM 121038

Angewandte Chemie, EarlyView.
Ein Biosynthese‐Gencluster aus Streptomyces sp. YIM 121038 wurde untersucht, wobei die Produktion des Sesterterpens Tibonen A und seines Oxidationsprodukts Tibonon nachgewiesen wurde. Der Cyclisierungsmechanismus zu Tibonen A wurde mittels Isotopenmarkierungsexperimenten, DFT‐Berechnungen und Eingriffen in die Enzym‐Substrat‐Wechselwirkung durch ...
Min Wang, Zhiyuan Ren, Mengyao Zhang, Heng Li, Bernd Goldfuss, Jeroen S. Dickschat, Anwei Hou   +6 more
wiley   +1 more source

β‐C(sp3)—H Arylierung Aliphatischer Sulfonamide

Angewandte Chemie, EarlyView.
Das erste Protokoll zur β‐C(sp3)—H‐Aktivierung/Funktionalisierung aliphatischer Sulfonamide wird beschrieben. Die Arylierung solcher Substrate wird durch den Einsatz von N‐Acetylthioether‐Liganden ermöglicht und zeichnet sich durch ein breites Substratspektrum sowohl hinsichtlich des Sulfonamid‐Substrats als auch des Arylierungsreagenzes aus.
Friedrich Jurk, Isaac G. Sonsona, Manuel van Gemmeren   +2 more
wiley   +1 more source

Cluster dynamics modeling of hydrogen retention and desorption in tungsten with saturation and multi-trapping effect of sinks

Nuclear Fusion
Hydrogen (H) retention and desorption in tungsten (W)-based plasma-facing materials are still not well understood, largely due to the limitations of ex-situ observations in experimental detection methods like thermal desorption spectroscopy (TDS).
Xiaoru Chen, Yuanyuan Zhang, Liuming Wei, Qirong Zheng, Chuanguo Zhang, Yonggang Li   +5 more
doaj   +1 more source

Gold Single‐Atom Catalysts Enable Selective Shuttle Hydrochlorination of Alkynes

Angewandte Chemie International Edition, EarlyView.
Gold single‐atom catalysts on activated carbon enable heterogeneous shuttle hydrochlorination of terminal alkynes to vinyl chlorides with high chemo‐ and stereo‐selectivity thanks to cooperation between Au(I) sites and the support. The catalytic system combines broad substrate compatibility, simplified separation, and recoverability, paving the way for
Marc‐Eduard Usteri, Eva J. Meeus, Christian Zachau, Seung‐Eun Choi, Aram Bugaev, Milivoj Plodinec, Sharon Mitchell, Bill Morandi, Javier Pérez‐Ramírez   +8 more
wiley   +1 more source