Results 141 to 150 of about 23,430 (289)

A Low‐Symmetry FeII Tetrahedron From a Flexible Tritopic Ligand

Chemistry – A European Journal, EarlyView.
A highly symmetric and flexible tris‐bidentate tritopic ligand forms an S4 meso homoleptic face‐capped FeII tetrahedron near‐quantitatively in acetonitrile. The addition of nitromethane solvent causes partial isomerization of this meso cage to the racemic homochiral tetrahedron, with the complexity of the system being moderated through solvophobic ...
Rosemary J. Goodwin, Nina R. Lawson, Michael G. Gardiner, Jack D. Evans, Paul E. Kruger, Dan Preston   +5 more
wiley   +1 more source

Polarity on Demand: Nucleophilic, Electrophilic, and Ambiphilic Reactivity at a 9,10‐Dihydro‐9,10‐Disilaanthracene Platform

Chemistry – A European Journal, EarlyView.
A 9,10‐dihydro‐9,10‐disilaanthracene platform was efficiently synthesized and features intrinsically electrophilic Si sites. Upon stepwise reductive Si─H bond cleavage, these Si sites are converted into nucleophilic centers. This controlled polarity switching also enables ambiphilic reactivity within a homo‐heteroelement framework.
Moritz Schmidt, Alexander Virovets, Eugenia Peresypkina, Hans‐Wolfram Lerner, Matthias Wagner   +4 more
wiley   +1 more source

Covalent Insertion of a Mn(Salen) Type Complex in Cross‐Linked Protein Crystals: Design of an Enantioselective Artificial Epoxidase

Chemistry – A European Journal, EarlyView.
An Artificial metalloenzyme was designed by a Michael addition between a MnSalen complex and a cysteine residue within NikA crystals. The heterogeneous catalyst was found capable of an enantioselective and stereospecific epoxidation of cis‐β‐methylstyrene in cristallo.
Manel Boukhallat, Ismail Benhamed, Jade Arnone, Stann Van Baaren, Clara Rinaldi, Patrice Catty, Caroline Marchi‐Delapierre, Christine Cavazza, Stéphane Ménage   +8 more
wiley   +1 more source

Asymmetric Diphosphane Dioxides With A–π–A–π’–D Scaffolds for High‐Purity Deep‐Blue Luminescence

Chemistry – A European Journal, EarlyView.
Diphosphane dioxide‐based luminophores with donor–π–acceptor– π’–acceptor scaffold enable efficient deep‐blue emission from tunable charge‐transfer states affording high photoluminescence up to 95%. OLEDs reach EQE 4.9%, aided by triplet–triplet annihilation, highlighting a practical route to high‐performance blue emitters.
Eetu Hakkarainen, Zong‐Ying Liu, Jhon Sebastian Oviedo Ortiz, Nicolas Vanthuyne, Jeanne Crassous, Ondřej Mrózek, Fabien B. L. Cougnon, Wen‐Yi Hung, Pi‐Tai Chou, Igor O. Koshevoy, Andrey Belyaev   +10 more
wiley   +1 more source

Post‐Modification of Tripyrenylenes to Enantiopure π‐Extended D3‐Symmetric Propellers

Chemistry – A European Journal, EarlyView.
The post‐modification of tripyrenylenes to π‐extended enantiopure propellers with tris‐phenanthrophenazines is presented and the chiroptical properties as well as the solid‐state packings investigated in comparison to the corresponding racemic mixtures.
Dennis Popp, Melanie Bruttel, Sebastian Möbert, Anusha Sounder Rajan, Christoph Keck, Darius Boehm, Frank Rominger, Sven M. Elbert, Michael Mastalerz   +8 more
wiley   +1 more source

Non-Classical Studies for Cyclic Preferential Crystallization of a Stable Racemic Compound

, 2020
De nombreux principes actifs pharmaceutiques sont des composés chiraux. Les deux énantiomères des molécules correspondantes présentent des propriétés chimiques et physiques identiques mais l’activité biologique est souvent associée à un seul des deux ...
Harfouche, Lina
core  

Synthesis and Structure of an S‐Shaped Double Expanded Helicene With Seven Fused Anthracene Units

Chemistry – A European Journal, EarlyView.
The anthracene‐fused aromatic compound was synthesized by four‐fold cycloisomerization of the corresponding alkyne precursor. X‐ray crystallographic analysis revealed that this compound had a double helical structure of Ci symmetry, in which the terminal and central anthracene units were triply stacked.
Shinji Toyota, Kaito Hohno, Takehiro Kihara, Yu Watanabe, Yuki Shigihara, Eiji Tsurumaki, Masahiro Yamashina   +6 more
wiley   +1 more source

Coordination Compounds of Alkali Metal Halides and Racemic Diaryl Diamines

, 1969
Solid alkali metal coordination compounds of water soluble alkali metal salts of monobasic acids and racemic diamines are made by contacting an aqueous solution of the alkali metal salts with a solution of a racemic diamine compound of the formula ...
Marullo, Nicasio P
core   +1 more source

Stereoretentive Nucleophilic Aromatic Substitution Accesses Atropisomeric 4‐Amino‐N‐Arylquinolinium Salts

Chemistry – A European Journal, EarlyView.
Quinolin‐4‐ones were converted to chloroquinolinium salts, allowing formation of axially chiral aminoquinolinium salts via an enantioretentive SNAr reaction with a variety of amine nucleophiles. The salts have a high rotational barrier, with a racemization half‐life of ∼1000s of years.
Darren Holmes, Nia Foster, Saima Ansari, Paul Kavanagh, Paul Dingwall, Peter C. Knipe   +5 more
wiley   +1 more source

Nitrooxylation in Organic Synthesis: From Classical Nitrate Ester Formation to Modern Catalytic Strategies

Chemistry – A European Journal, EarlyView.
Nitrooxylation—the installation of nitrate esters (–ONO2) has evolved from classical mixed‐acid protocols to catalytic and mechano‐, flow‐, photo‐, and electrochemical strategies. This review delineates ionic and radical manifolds for C–ONO2 bond formation, emphasizing mechanistic control, selected substrate scope, and selectivity.
Jayanta Dey, Dmitry Katayev
wiley   +1 more source