Results 221 to 230 of about 52,647 (305)

Adaptive Hydrogenation of Alkynes Using CO as a Molecular Trigger to Selectively Produce Alkanes or Z‐Alkenes

Angewandte Chemie, EarlyView.
One catalyst for two products: CO acts as a molecular trigger for adaptive alkyne hydrogenation using supported Pd nanoparticles. The catalyst reversibly switches between the formation of alkanes under H2 and Z‐alkenes under H2/CO for 37 structurally diverse alkynes.
Manisha Durai, Lachlan Sharp‐Bucknall, Tim Alexander Schubert, Jacob Johny, John‐Tommes Krzeslack, Walid Hetaba, Walter Leitner, Alexis Bordet   +7 more
wiley   +1 more source

Catalytic Functionalization of Unactivated π-Bonds Enabled by Bidentate Directing Auxiliaries. [PDF]

Angew Chem Int Ed Engl
Cho S, Lisboa AVRD, Sun J, Kang T, Engle KM.   +4 more
europepmc   +1 more source

TADF‐Active Tetrazole Luminophores for Visible‐Light Functionalization of Nanoparticles and Surfaces

Angewandte Chemie, EarlyView.
A series of tetrazoles are reported that undergo 1,3‐dipolar cycloadditions with alkene and alkyne substrates, generating (dihydro)pyrazole products that exhibit thermally activated delayed fluorescence (TADF). The “photo‐click” reactivity of these tetrazoles is leveraged to functionalize nanoparticles and surfaces with TADF‐active chromophores ...
Ryoga Hojo, Katrina Bergmann, Siyuan L. Xie, Connor S. Durfy, William L. Primrose, Athan T. Gogoulis, Seja A. Elgadi, Mitchell J. Demchuk, Thomas Kalab, Peiqi Hu, Eva M. Nichols, Zachary M. Hudson   +11 more
wiley   +1 more source

Regio- and Enantioselective Alkoxycarbonylation of Unactivated Terminal Alkenes under Palladium-Bromide-Monophosphine Catalysis. [PDF]

J Am Chem Soc
Sigrist M, Das K, Kurpik G, Tian W, Huang J, Covas A, Bond AD, Tang W, Dydio P.   +8 more
europepmc   +1 more source

Modular Access to α‐Tertiary Amines: Electrochemical Tandem Di‐Functionalization of Olefins With Ammonia Surrogates and Amino Acids

Angewandte Chemie, EarlyView.
A metal‐ and oxidant‐free electrochemical multicomponent di‐functionalization strategy that rapidly converts 1,1‐disubstituted alkenes into α‐tertiary primary amines with simultaneous installation of bio‐relevant sulfur or selenium motifs was devised for late‐stage functionalization. ABSTRACT Quaternary carbon centers, especially those bearing nitrogen,
Adrija Ghosh, Tarun, Sven Erik Peters, Lutz Ackermann, Debasis Banerjee   +4 more
wiley   +1 more source

Excitation of acyclic trisubstituted alkenes via triplet energy transfer for diastereo- and enantioselective [2 + 2] photocycloaddition. [PDF]

Nat Commun
Long J, Wen J, Mo Z, Chen X, Wang T, Fang X.   +5 more
europepmc   +1 more source

Fine Tuning of Catalyst Active Sites to Access Advanced Ultrahigh‐Melting Polyolefins

Angewandte Chemie, EarlyView.
A redesign of the active site of the pyridylamido hafnium (Hf) catalysts can enhance the performance of this catalyst family and unlock previously inaccessible polymer structures. When the catalyst is precontacted with allyltrimethylsilane the active species is modified and the catalyst experiences a new life becoming able to polymerize sterically ...
Fabio De Stefano, Olga D'Anania, Giovanni Talarico, Claudio De Rosa   +3 more
wiley   +1 more source

Nitrogen Radical Photocatalysed Reduction of Nitrous Oxide

Angewandte Chemie, EarlyView.
This work offers the first example of reduction of the potent greenhouse gas N2O to the benign products N2 and O(Bpin)2 using a nitrogen‐based catalyst. The active catalyst is shown to be a nitrogen‐based radical which operates under photocatalytic conditions.
Reece Lister‐Roberts, Agamemnon E. Crumpton, Meera Mehta   +2 more
wiley   +1 more source

Diastereodivergent Hydroamidation of Methylenecyclohexanes With Differentiated Active Catalytic Species. [PDF]

Angew Chem Int Ed Engl
Li Z, Tong YZ, Duan KR, Men BR, Lu Q, Lu X, Fu Y.   +6 more
europepmc   +1 more source

Metal Oxides Catalyze Formation of Dehydroamino Acids by Phosphate β‐Elimination Under Physiological Conditions

Angewandte Chemie, EarlyView.
Dehydroamino acids (DHAA) are atypical electrophilic sites that lead to crosslinked proteins in Alzheimer's disease (AD) brains. No catalyst for their formation has been known in humans. We report that metal oxides catalyze β‐elimination of phosphoserine and phosphothreonine in model peptides at pH 7.5°C and 37°C, yielding DHAAs.
Samuel W. Markovich, Brian L. Frey, Mark Scalf, Lloyd M. Smith   +3 more
wiley   +1 more source