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E-Z isomerization in Suzuki cross-couplings of haloenones: Ligand effects and evidence for a separate catalytic cycle.

24.01.2018 | Navneet Chehal; Peter H M Budzelaar; Philip Hultin, Organic & Biomolecular Chemistry, 2018

Suzuki cross-coupling of haloalkenes is generally assumed to occur with retention of the alkene stereochemistry. While studying Suzuki cross-couplings on E-1,2-dichlorovinyl phenyl ketone, we were surprised to observe extensive isomerization. More surprisingly, the ligand employed strongly ...

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Development of a novel scoring system for identifying emerging chemical risks in the food chain

24.01.2018 | Jan Oltmanns; Oliver Licht; Annette Bitsch; Marie-Leonie Bohlen; Sylvia Escher; Vittorio Silano; Matthew MacLeod; Ro ..., Journal of Environmental Monitoring, 2018

The European Food Safety Authority (EFSA) is responsible for risk assessment of all aspects of food safety, including the establishment of procedures aimed at the identification of emerging risks to food safety. Here, a scoring system was developed for identifying chemicals registered under the ...

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Central-metal effect on intramolecular vibrational energy transfer of M(CO)5Br (M = Mn, Re) probed by two-dimensional infrared spectroscopy

24.01.2018 | Fan Yang; Xueqian Dong; Minjun Feng; Juan Zhao; Jianping Wang, Physical Chemistry Chemical Physics, 2018

Vibrational energy transfer in transition metal complexes with flexible structures in condensed phases is of central importance to catalytical chemistry processes. In this work, two molecules with different metal atoms, M(CO)5Br (where M = Mn, Re), were used as model systems, and their axial and ...

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A Multinuclear NMR Perspective on the Complexation between Bisboronic acids and Bisbenzoxaboroles with cis-Diols

24.01.2018 | Adele Larcher; Aurélien Lebrun; Mike Smietana; Danielle Laurencin, New Journal of Chemistry, 2018

The interaction between boronic acids and cis-diols is an intense area of research, with numerous applications in sensing, separation, drug delivery, and materials science. Several analytical tools have been proposed over the past 20 years to probe these interactions, but most of them are limited ...

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Catalytic Hydrogenation of N-4-nitrophenyl Nicotinamide in a Micro-Packed Bed Reactor

24.01.2018 | Cuixian Yang; Andrew R Teixeira,; Yanxiang Si; Stephen Born; Hongkun Lin; Yunfei Li Song; Maryam Peer; Benjamin M ..., Green Chemistry, 2018

Recent advancements in micro-flow technologies and a drive toward more efficient, greener and safer processes have led to aincreased focus on flow-chemistry for pharmaceutical production. In this work, we demonstrate the use of a stabilized Pd nanoparticle-organic-silica catalyst to selectively ...

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Hot off the press

24.01.2018 | Robert A. Hill; Andrew Sutherland, Natural Product Reports, 2018

A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as illisimonin A from Illicium simonsii.

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Lignin nanoparticles: Synthesis, characterization and their corrosion protection performance

24.01.2018 | Obaid ur Rahman; Shubin Shi; jiheng ding; Dondlin Wang; Sharif Ahmad; Haibin Yu, New Journal of Chemistry, 2018

Conversion of micro lignin to lignin nanoparticles (LNP) and their application in engineering and technology is a potential step towards global sustainability because lignin obtained from industrial and agricultural waste, and green chemistry stimulate their utilization. Present work reports the ...

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X-ray photochemistry of carbon hydride molecular ions

23.01.2018 | Alessandra Puglisi; Tsveta Miteva; Eugene Kennedy; Jean-Paul Mosnier; Jean-Marc Bizau; Denis Cubaynes; Nicolas Sisou ..., Physical Chemistry Chemical Physics, 2018

Hydride molecular ions are key ingredients of the interstellar chemistry since they are precursors of more complex molecules. In regions located near a soft x-ray source these ions may resonantly absorb an x-ray photon which triggers a complex chain of reactions. In this work, we simulate {\it ab ...

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Synthesis and characterization of zinc carboxy-porphyrin complexes for dye sensitized solar cells

23.01.2018 | Claude P Gros; Clément Michelin; Léo Bucher; Nicolas Desbois; Charles Hugo Devillers; Athanassios G. G Cou ..., New Journal of Chemistry, 2018

Two zinc porphyrins, 2 and 8, have been synthesized. Porphyrin 8 displays better electronic communication between the dye and the TiO2 electrode. Photophysical measurements and electrochemistry experiments suggest that both porphyrins are very promising sensitizers for dye-sensitized solar cells ...

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Tuning the nucleophilicity of electron-rich diborane(4) compounds with bridging guanidinate substituents by substitution

23.01.2018 | Julian Horn; Anna Widera; Sebastian Litters; Elisabeth Kaifer; Hans-Jörg Himmel, Dalton Transactions, 2018

Diborane(4) compounds are versatile reagents in synthetic chemistry. Generally, diboranes(4) with sp2-hybridized boron atoms react as electrophiles. By contrast, the chemistry of nucleophilic diborane(4) compounds with two sp3-hybridized boron atoms is very much underdeveloped. In this work, we ...

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