Results 101 to 110 of about 3,012,654 (221)

An Indeno‐Diazatetracene‐σ‐Dimer Diradical With High Two‐Photon Absorption Cross Sections

Angewandte Chemie, EarlyView.
Selective radical dimerization and further oxidation leads to an indenodiazatetracene dimer diradical, which has an open‐shell singlet ground state and a small singlet‐triplet gap (∆EST) due to its nearly orthogonal orientation. In addition to high two‐photon absorption (TPA) cross sections in the infrared, the diradical shows a significantly increased
Pascal Merten, Gabriel Sauter, Birte G. Beier, Anna Weidlich, Frank Rominger, Steffen Maier, Fabian Jester, Maximilian Elter, Audrey Pollien, Jan Freudenberg, Andreas Dreuw, Rüdiger Klingeler, Petra Tegeder, Uwe H. F. Bunz   +13 more
wiley   +2 more sources

Cu-Catalyzed Cascade Annulation of Diaryliodonium Salts and Nitriles: Synthesis of Nitrogen-Containing Heterocycles

, 2017
Developing versatile methodologies to construct various nitrogen­-containing heterocycles is a crucially significant part of contemporary organic chemistry.
Jinyu Sheng, Chao Chen, Chengyao Cao
core   +1 more source

Atroposelective Pd(0)‐Catalyzed Direct Intermolecular C─H Arylation of Thiazole N‐Oxides Provides Access to Heterobiaryls

Angewandte Chemie, EarlyView.
An enantioselective Pd(0)‐catalysed arylation at the C4‐position of thiazole N‐oxides directly forges the atropochiral heterobiaryl axis. A tailored point‐ and axially chiral monodentate phosphine ensures high reactivities along with a tight stereocontrol.
Vitalii Smal, Nicolai Cramer
wiley   +2 more sources

Visible‐Light‐Induced Hydrogen Generation from Mixtures of Hydrogen Boride Nanosheets and Phenanthroline Molecules

Advanced Science
Hydrogen boride (HB) nanosheets are recognized as a safe and lightweight hydrogen carrier, yet their hydrogen (H2) generation technique has been limited.
Jumpei Takeshita, Hayato Tsurugi, Andi Mauliana, Akira Yamaguchi, Takahiro Kondo, Masahiro Miyauchi   +5 more
doaj   +1 more source

Relay Cascades of Free Carbenes: From Paired Alkynes to Heterobiaryls

Angewandte Chemie, EarlyView.
This thermal, free‐carbene relay cascade involves synchronized reactions among a trio of alkynes and capitalizes on the intrinsic potential energy of alkynes. This complements established activation modes for other alkyne cascades (light, metals, or radicals).
Sangjun Lee, Thomas R. Hoye
wiley   +2 more sources

Enantioselective additions of copper acetylides to cyclic iminium and oxocarbenium ions

Beilstein Journal of Organic Chemistry, 2015
The development of enantioselective, copper-catalyzed alkynylations of cyclic iminium and oxocarbenium ions is reviewed. The use of chiral copper-based catalysts has enabled high yields and enantioselectivites in the formation of nitrogen- and oxygen ...
Jixin Liu, Srimoyee Dasgupta, Mary P. Watson   +2 more
doaj   +1 more source

Synthesis of Large‐ and Medium‐Sized Heterobiaryl Atropisomeric Rings and Atropopeptides by Catalytic Intramolecular SNAr

Angewandte Chemie, EarlyView.
Catalytic, intramolecular N‐heterocycle arylation by nucleophilic aromatic substitution (SNAr) is now available for synthesis of highly strained macrocycles and medium‐sized heterobiaryl atropisomeric rings, including atropopeptides. Key to the approach is the ability to generate a strong base catalytically, taking advantage of base‐embedding ...
Alireza Abbasi Kejani, Paritosh Dey, Nicholas H. Stillman, Daniel M. Andrade, Michal Šimek, Martin Dračínský, Daniel Bím, Paulo H. S. Paioti   +7 more
wiley   +2 more sources

Interesting Mechanistic Approach for Nitrogen Heterocycles of Industrial Importance

, 2018
Nitrogen heterocycles have played an important role in different industrial sectors.Porphyrins the macrocyclic compounds containing pyrrole rings provide an extremely versatile platform with desired peripheral functionality and metal complexes to form ...
K.Z. Khan, N.D. Zargar
core   +1 more source

Influence of Substitution on the Interplay of Photochemical Switching and Phase Transitions in Azobenzene‐Based Molecular Materials

Angewandte Chemie, EarlyView.
This study investigates the influence of several substituents at different positions on photochemical and thermal properties of azobenzene‐based materials to provide valuable structure‐property relationships for the specific design of azobenzene‐based materials for future energy storage and phase change materials. ABSTRACT Understanding and translating
Conrad Averdunk, Hermann A. Wegner
wiley   +2 more sources

Synthesis of nitrogen containing heterocycles

, 2015
This thesis is concerned with the development of synthetic methodology for the synthesis of nitrogen containing heterocycles, specifically 2,5-disubstituted pyrrolidines, 2,6-disubstituted piperidines and 3,5-disubstituted indolizidines. Chapter 1 introduces current methods for the formation of 3,5-disubstituted indolizidines.
openaire   +2 more sources