Results 21 to 30 of about 14,177,191 (172)

π‐Radical Cascades to Peri‐Fused Triangulene Dimers

Angewandte Chemie, EarlyView.
We demonstrate the potential of open‐shell molecular graphene fragments as synthons for constructing graphene nanostructures via π‐radical cascades. By identifying monoradical intermediates as key selectivity‐determining species and tuning steric effects in a triangulene precursor, we show that reactivity in a formally diradical system can be ...
Paula L. Widmer, Leoš Valenta, Maximilian Mayländer, Jules Hutter, Francis J. Carta, Simon Jurt, Olivier Blacque, Laurent Bigler, Sabine Richert, Tomáš Šolomek, Michal Juríček   +10 more
wiley   +2 more sources

Enumeration of Kekule Structures of Polyhex Monoradical Having Only Linear Assemblies of Benzenoid Hydrocarbons

Science Journal of Chemistry, 2019
A mathematical process of enumeration of Kekule structures of any polybenzenoid monoradical having only linear assemblies of benzenoid hydrocarbons is given by using a method which consisted of the excision of the radical center in order to obtain a ...
A. Emadak, R. M. Nemba, Leonel Tsassi Djoumessi, Jules Cesar Epee Ndongue   +3 more
semanticscholar   +1 more source

m-Quinodimethane-Based Fused-Ring Diradicals with Singlet and Triplet Ground States

Chemistry
Diradicals have attracted the attention of chemists due to their unique electronic structures and properties originating from unpaired electrons. One of the fundamental motifs of diradicals is quinodimethane; p- and o-quinodimethanes are singlet Kekulé ...
Akihiro Shimizu
doaj   +1 more source

Algebraic structure count of linear phenylenes and their congeners [PDF]

Journal of the Serbian Chemical Society, 2003
The algebraic structure count of the linear phenylene with h six-membered rings is known to be equal to h + 1. We show that the same expression applies if each four-membered ring in the phenylene is replaced by a linear array consisting of k four ...
IVAN GUTMAN
doaj  

Automated extraction of chemical structure information from digital raster images

Chemistry Central Journal, 2009
Background To search for chemical structures in research articles, diagrams or text representing molecules need to be translated to a standard chemical file format compatible with cheminformatic search engines.
Shedden Kerby A, Rosania Gus R, Park Jungkap, Nguyen Mandee, Lyu Naesung, Saitou Kazuhiro   +5 more
doaj   +1 more source

Radical‐Based On‐Surface Transformation of Nonplanar Aromatics Into Nonbenzenoid Nanographenes

Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.
Formation of radicals in nonplanar hydrocarbons through thermally induced dehydrogenation leads to molecular transformation via intramolecular radical‐based cyclization and dimerization, leading to formation of nonbenzenoid nanographenes. ABSTRACT On‐surface synthesis has emerged as a powerful tool for atomically precise C─C bond formation, enabling ...
Daniel Rothhardt, Ming‐Lun Pan, Michael Píro, Stefan Niklaus Heinen, Christian Wäckerlin, Hans Josef Hug, Yao‐Ting Wu, Karl‐Heinz Ernst, Miloš Baljozović   +8 more
wiley   +2 more sources

Kekulé structures of polyomino chains and the Hosoya index of caterpillar trees

Discrete Mathematics, 2012
Let H be a hexagonal chain. Gutman [I. Gutman, Topological properties of benzenoid systems, Theor. Chim. Acta, 45 (1977), 307–315.] proved that there exists a caterpillar tree T ( H ) such that the number of Kekule structures of H is equal to the Hosoya ...
Shuli Li, Weigen Yan
semanticscholar   +1 more source

Asymmetric α‐Alkylation With Activated and Unactivated Electrophiles by a Highly Productive and Recyclable Lewis Acid/Imidazolium Catalyst

Angewandte Chemie International Edition, EarlyView.
An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann, Alexander Beck, Dominik Hornung, Michael Mistele, Alexander Allgaier, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +8 more
wiley   +1 more source

O nekim zanimljivim rezultatima postignutim u Hrvatskoj u području kemijske teorije grafova (On Some Interesting Results Achieved in Chemical Graph Theory in Croatia) [PDF]

Kemija u Industriji, 2006
Some interesting results achieved in chemical graph theory in Theoretical Chemistry Group at the Rugjer Bošković Institute are briefly reviewed. In the article are discussed the use of the Sachs theorem for the construction of the characteristic ...
Trinajstić, N.
doaj  

Dynamic Covalent Radical Recombination for the Assembly of Tuneable Responsive Porous Organic Cages

Angewandte Chemie International Edition, EarlyView.
Dynamic covalent chemistry (DCC) based on reversible radical recombination enables the assembly of responsive, C─C‐linked organic cages. Substituent‐controlled aryldicyanomethyl radicals form discrete, porous architectures with tuneable topology of Tri2 and Tri4 cages, gas selectivity, chromism, and self‐healing behaviour, establishing radical‐based ...
Yannic Hartmann, Robert Oestreich, Yuki Wada, Philippe de Bary, Masaki Kawano, Christoph Janiak, Bernd M. Schmidt   +6 more
wiley   +1 more source