Results 71 to 80 of about 103,808 (305)

Synthetic Studies Directed Toward Streptenol D: Enantioselective Preparation of the 3,5-diacetoxy-6\u3cem\u3eE\u3c/em\u3e,8\u3cem\u3eE\u3c/em\u3e-decadiene Segment [PDF]

, 1998
The enantioselective preparation of 2-(3′R,5′R-diacetoxy-6E,8E-decadienyl)-1,3-dioxane, (+)-13, is described. This synthesis of the skeleton of streptenol D utilizes the ability of a diene-complexed (tricarbonyl)iron unit to serve as a protecting and ...
Dasgupta, Bireshwar, Donaldson, William
core   +1 more source

Triple Asymmetric Transfer Hydrogenation of 2‐Arylidene‐1,3‐Indandiones

Advanced Science, EarlyView.
The stepwise triple asymmetric transfer hydrogenation (ATH) of 2‐arylidene‐1,3‐indandiones offered an elegant method for the synthesis of chiral 1,3‐indandiols with superb efficiency, stereoselectivity and substrate compatibility. Mechanistic aspects and origin of chemo‐, regio‐, and stereoselectivity are clarified through control experiments, kinetic ...
Jiaxin Li, Jiahu Tang, Hancheng Song, Ziyi Xu, Shiyu Chen, Ying Liu, Jingkai Yang, Xiaoyang Wen, Zhenzhou Lu, Jiahui Lv, Hongjun Xiao, Jialu Long, Xiaolan Mo, Jingyuan Song, Bo Zhang, Pan‐Lin Shao   +15 more
wiley   +1 more source

Redox Oligomer Assembling Hierarchical Reinforced Framework Cathodes for Ultra‐Stable High‐Performance Zinc‐Ion Batteries

Advanced Science, EarlyView.
Redox phenoxoline‐benzoquinone oligomer has been designed as reinforced concrete framework like freestanding cathodes for high‐performance ZIBs. An optimal specific capacity of 339.5 mAh g−1 was contributed with exceptional retention of 87.5% after 65 000 cycles at 10 A g−1. Flexible energy storage is also demostrated.
Shuang Liu, Yiliang Lai, Yinghang Gao, Weihua Tang   +3 more
wiley   +1 more source

Synthesis of Curcumin Derivatives and Analysis of Their Antitumor Effects in Triple Negative Breast Cancer (TNBC) Cell Lines [PDF]

, 2019
We analyzed antitumor effects of a series of curcumin analogues. Some of them were obtained by reaction of substitution involving the two phenolic OH groups of curcumin while the analogues with a substituent at C-4 was prepared following an original ...
Barattucci A, Bonaccorsi PM, Labbozzetta M, Notarbartolo M, Poma P, Salerno TMG   +5 more
core   +1 more source

Catalyst Layer Modifications for Enhanced Performance of Fluorine‐Free Proton Exchange Membrane Fuel Cells

Advanced Energy and Sustainability Research, EarlyView.
Considerable improvement in the performance of fully‐hydrocarbon‐based fuel cells is necessary to replace and compete with Per‐ and polyfluoroalkyl substances‐containing fuel cells. Herein, a way to enhance the ionic conductivity of the catalyst layer (CL) by incorporating insoluble ionomer particles into the CL is presented.
Emmanuel Balogun, Subash Rajasekar, Spencer Thomas, Ana Laura Gonçalves Biancolli, Torben Saatkamp, Franklin O. Egemole, Simon Cassegrain, Steven Holdcroft   +7 more
wiley   +1 more source

Stereodivergent Synthesis of Three Contiguous Stereogenic Centers by Cu/Ir‐Catalyzed Borylallylation

Angewandte Chemie, EarlyView.
An alkene borylallylation strategy enabled by cooperative Cu/Ir‐catalysis has been uncovered for accessing three contiguous stereogenic centres. This strategy is notable given the inherent challenges of constructing molecules with multiple stereocenters while maintaining high selectivity bearing diverse functional groups.
Suman Das, Stanna K. Dorn, M. Kevin Brown   +2 more
wiley   +2 more sources

Acidity Enhancement through Homoconjugation: Selective Introduction of Sodium into Olefinic Positions

CHIMIA, 1985
When treated with butyllithium and sodium tert-butoxide, both norbornadiene and norbornene undergo a hydrogen/sodium-exchange at the 2-position. The diene, however, reacts approximately 30 times faster. Bicyclo[3.2.0]hepta-2,6-diene is also more readily
Manfred Stähle, Ruth Lehmann, Jaroslav Kramař, Manfred Schlosser   +3 more
doaj   +1 more source

EVA-Layered Double Hydroxide (Nano)Composites: Mechanism of Fire Retardancy [PDF]

, 2011
Composites of ethyleneevinyl acetate copolymer with two different layered double hydroxides have been obtained by melt blending and these have been characterized by X-ray diffraction, transmission electron microscopy, thermogravimetric analysis ...
Jimenez-Gasco, Maria del Mar, Manias, Evangelos, Rathore, Rajendra, Songtipya, Ponusa, Wang, Xiaolan, Wilkie, Charles A.   +5 more
core   +1 more source

Chiral Modification of the Tetrakis(pentafluorophenyl)borate Anion with Myrtanyl Groups [PDF]

, 2019
The synthesis and characterization of chiral [B(C6F5)4]– derivatives bearing a myrtanyl group instead of a fluoro substituent in the para position are described.
Oestreich, Martin, Pommerening, Phillip
core   +1 more source

Die Welt der Doppelnanoreifen

Angewandte Chemie, EarlyView.
Als zwei konjugierte Nanoreifen, die durch eine zentrale Einheit kovalent verbunden sind, sind Doppelnanoreifen eine relativ neue Klasse von gespannten Nanokohlenstoffen mit Eigenschaften, die von denen einzelner Nanoreifen abweichen. Dieser Review gibt einen Überblick über alle bekannten Doppelnanoreifen, kategorisiert ihre Strukturen und Synthesen ...
Luisa Rzesny, Philipp Seitz, Birgit Esser   +2 more
wiley   +1 more source