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76 Aktuelle Fachpublikationen zum Thema Additive


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Conversion of Olefins to Ketones by an Iron‐Catalyzed Wacker‐type Oxidation Using Oxygen as Sole Oxidant

05.12.2017 | Florian Puls, Hans-Joachim Knölker, Angewandte Chemie, 2017

We describe a mild and operationally simple protocol for the oxidation of olefins to ketones. The reaction is catalyzed by the hexadecafluorinated iron‐phthalocyanine complex FePcF16 using stoichiometric amounts of triethylsilane as additive under oxygen to give ketones in good to high yields ...


Subporpholactone, Subporpholactam, Imidazolosubporphyrin, and Iridium Complexes of Imidazolosubporphyrin: Formation of Iridium Carbene Complexes

15.11.2017 | Atsuhiro Osuka, Kota Yoshida, Angewandte Chemie, 2017

Pyrrole‐modified subporphyrins bearing a non‐pyrrolic cyclic unit, subporpholactone, subporpholactam, and imidazolosubporphyrin were newly synthesized. They show subporphyrin‐like absorption and fluorescence spectra that are red‐shifted in the order of subporpholactam


Lithium Azide as an Electrolyte Additive for All‐Solid‐State Lithium–Sulfur Batteries

25.10.2017 | Gebrekidan Gebreslase Eshetu, Xabier Judez, Chunmei Li, Alex Bondarchuk, Lide Mercedes Rodriguez-Martinez, Heng Zh ..., Angewandte Chemie, 2017

Abstract Of the various beyond‐lithium‐ion battery technologies, lithium–sulfur (Li–S) batteries have an appealing theoretical energy density and are being intensely investigated as next‐generation rechargeable lithium‐metal batteries. However, the stability of the lithium‐metal (Li°) anode is ...


Black Phosphorus Quantum Dots Used for Boosting Light Harvesting in Organic Photovoltaics

25.09.2017 | Shenghua Liu, Shenghuang Lin, Peng You, Charles Surya, Shu Ping Lau, Feng Yan; Shenghua Liu, Shenghuang Lin, Peng Yo ..., Angewandte Chemie, 2017

Abstract Although organic photovoltaic devices (OPVs) have been investigated for more than two decades, the power conversion efficiencies of OPVs are much lower than those of inorganic or perovskite solar cells. One effective approach to improve the efficiency of OPVs is to introduce additives ...


Liquid Tubule Formation and Stabilization Using Cellulose Nanocrystal Surfactants

10.08.2017 | Xubo Liu, Shaowei Shi, Yanan Li, Joe Forth, Dong Wang, Thomas P. Russell, Angewandte Chemie, 2017

Structured liquids, generated by the in situ interfacial generation, assembly and jamming of nanoparticle (NP)‐surfactants at liquid interfaces, maintain all the desirable characteristics of each liquid, while providing a spatially structured frame work. Here, we show that rod‐like cellulose ...


The Effect of Additives on the Early Stages of Growth of Calcite Single Crystals

02.08.2017 | Yi-Yeoun Kim, Colin Freeman, Xiuquing Gong, Mark A Levenstein, Yunwei Wang, Alexander Kulak, Clara Anduix Canto, Sh ..., Angewandte Chemie, 2017

As crystallization processes are often occur rapid, it can be difficult to monitor the growth mechanisms. Here, we use the fact that crystallization proceeds more slowly in small volumes than in bulk solution, to investigate the effects of the soluble additives Mg2+ and poly(styrene sulfonate) ...


Understanding the Role of Additive Leads to an Improved Synthetic Protocol Obviating Additive: Organocatalytic Synthesis of Chiral Diarylmethyl Alkynes

19.07.2017 | Min Chen, Jianwei Sun, Angewandte Chemie, 2017

The use of additives for organic synthesis has become a common tactic to improve organic reaction outcomes. In this report, using an organocatalytic process for the synthesis of chiral diarylmethyl alkynes as a platform, we describe how an additive is involved in the improvement of the process. ...


Pd(II)‐Catalyzed Site‐Selective C(sp3)‐H Alkynylation of Oligopeptides: A Linchpin Approach for Oligopeptide‐Drug Conjugation

17.07.2017 | Tao Liu, Jennifer X Qiao, Michael A Poss, Jin-Quan Yu, Angewandte Chemie, 2017

The palladium(II)‐catalyzed C(sp3)‐H alkynylation of oligopeptides was developed with tetrabutylammonium acetate as a key additive. Through molecular design, the acetylene motif serves as a linchpin to introduce a broad range of carbonyl‐containing pharmacophores onto oligopeptides, thus ...


Hydroformylation of Alkenes in a Planetary Ball Mill: from Additive‐Controlled Reactivity to Supramolecular Control of Regioselectivity

03.07.2017 | Kévin Cousin, Stéphane Menuel, Eric Monflier, Frederic Hapiot, Angewandte Chemie, 2017

The Rh‐catalyzed hydroformylation of aromatic‐substituted alkenes is efficiently performed in a planetary ball mill under CO/H2 pressure. The dispersion of the substrate molecules and the Rh‐catalyst into the grinding jar is ensured by saccharides, namely, methyl‐α‐D‐glucopyranoside, ...


The effect of ultrasonic excitation on the microstructure of selective laser melted 304 L stainless steel

24.05.2017 | G.A. Tilita, W. Chen, C.C.F. Kwan, M.M.F Yuen, Materialwissenschaft und Werkstofftechnik, 2017

Abstract Selective laser melting is an additive manufacturing technology capable of creating near‐net‐shape products using a variety of materials. Parts made by selective laser melting have shortcomings in material behavior such as anisotropy, residual stresses, low ductility, and low fatigue ...


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