Results 71 to 80 of about 1,782 (182)

Trapping an Aryl‐substituted Borete Intermediate in Catalyst‐free 1,5‐Diborocine Synthesis

European Journal of Inorganic Chemistry, Volume 29, Issue 4, February 1, 2026.
A transient aryl‐substituted borete was trapped as its adduct with 4‐(dimethylamino)pyridine (dmap) and fully characterised. While the dmap adduct is highly kinetically stable, the free borete could not be observed in the absence of dmap. Density‐functional calculations support a rapid dimerisation of the borete via (4 + 4) cycloaddition, yielding a 1 ...
Douglas Turnbull, Marc‐André Légaré
wiley   +1 more source

Intermolecular alkyl radical addition to methyl 2-(2,6-Dichlorophenyl)-2H-azirine-3-carboxylate [PDF]

, 2012
The 2H-azirine 1 acts as an effective radical acceptor for secondary and tertiary alkyl iodides mediated by triethylborane.
Alves, Maria José Chão, Fortes, Gil, Guimaraes, Emanuel, Lemos, A.   +3 more
core  

Novel aziridine esters by the addition of aromatic nitrogen heterocycles to a 2H-azirine-3-carboxylic ester [PDF]

, 2000
Methyl 2-(2,6-dichlorophenyl)-2H-azirine-3-carboxoylate acts as an efficient alkylating agent for a variety of five-membered aromatic heterocycles. The aziridines derived from heterocycles that bear an alpha-carbonyl substituent react with TFA to give ...
Alves, Maria José Chão, Ferreira, Paula M. T., Gilchrist, T. L., Maia, Hernâni Lopes Silva, Monteiro, Luís S.   +4 more
core   +1 more source

Development of a Copper‐Free Click Reaction for Asymmetric Rh Diene Catalysis Under Confinement

Advanced Synthesis &Catalysis, Volume 368, Issue 1, January 2026.
A copper‐free amino–yne click reaction enables the selective functionalization of chiral diene ligands with both soluble and immobilized amines. Substituent‐controlled stereoselectivity affords (E)‐ and (Z)‐enaminone ligands, which are converted into Rh complexes for asymmetric catalysis under homogeneous and heterogeneous conditions.
Manuel Kirchhof, Sanja Krause, Liam Rautenbach, Jakoba Wacker, Ann‐Katrin Beurer, Hoang‐Huy Nguyen, Wolfgang Frey, Yvonne Traa, Deven P. Estes, Anna Zens, Sabine Laschat   +10 more
wiley   +1 more source

Cycloaddition reactions of conjugated azoalkenes [PDF]

, 2012
An overview of the use of 2H-azirines, conjugated nitrosoalkenes and conjugated azoalkenes bearing phosphorus substituents in addition and cycloaddition reactions is presented, focused on strategies for the synthesis of aminophosphonate and ...
Lemos, A.
core  

2-Thiabicyclo[3.2.0]hepta-3,6-Dienes. 3. Desulfuration and Sulfuration of 2-Thiabicyclo[3.2.0]hepta-3,6-Dienes and X-Ray Crystal Structure of 3a,6,7,8,9,9a-Hexahydro-3a,5-Dimethylthieno[3,2-B][2]benzothiophene-2,3-Dicarbonitrile [PDF]

, 1982
The 2-3.2.0] hepta-3,6-Dienes 1–7 Extrude Sulfur in Solution at 285 °C to Give the 1,2-Benzenedicarbonitriles 8–12 in Yields of 42–56%. 5-(1,1-Dimethylethyl)-3,6-Dimethyl-2-3.2.0] hepta-3,6-Diene-1,7-Dicarbonitrile (6) Reacts at 140 °C to Give a Mixture ...
den Hertog, Herman J., Hall, Richard H., Harkema, Sybolt, Reinhoudt, David N., Uiterwijk, Jos W.H.M., van Hummel, Gerrit J.   +5 more
core   +2 more sources

2H-Pyrrole und Pyrrole aus 3-Phenyl-2H-azirinen

CHIMIA, 1976
Vinyl-phosphonium salts [2] and phenyl-vinyl-sulfone or divinylsulfone react with benzonitril-methylides a (which are photochemically generated from 3-phenyl-2H-azirines 1 and 2) to give, via the nonisolated intermediates of type b, 2H-pyrrole 4 and the
Ulrich Widmer, Nikolas Gakis, Bruno Arnet, Heinz Heimgartner, Hans Schmid   +4 more
doaj   +1 more source

Synthesis and reactions of aminopropenes, which contains functional groups [PDF]

, 2013
В рамках данной работы осуществлен синтез енаминов, содержащих остатки первичных, вторичных, третичных аминов, а также амидную и тиоамидную группы. Проведено комплексное исследование структуры полученных соединений с помощью спектральных методов, включая
Lugovik, K. I., Луговик, К. И.
core  

Von Sauerstoff zu Tellur: Der Einfluss des Chalkogenatoms auf die Nucleophilie und Basizität von Isochalkogenharnstoff‐basierten Katalysatoren

Angewandte Chemie, Volume 137, Issue 48, November 24, 2025.
Der Einbau verschiedener Chalkogenatome (O, S, Se oder Te) in häufig verwendete Isochalkogenharnstoff‐Organokatalysatoren ermöglicht die Feinabstimmung ihrer Nucleophilie und Basizität. Kinetische und thermodynamische Deskriptoren für die molekularen Eigenschaften der Katalysatoren werden als Werkzeuge zur Vorhersage ihrer Effizienz eingeführt und in ...
Lotte Stockhammer, Kevin Kasten, Andreas Eitzinger, Lukas S. Vogl, Magdalena Piringer, David Weinzierl, Armin R. Ofial, Andrew D. Smith, Mario Waser   +8 more
wiley   +1 more source

From Oxygen to Tellurium: The Impact of the Chalcogen on Nucleophilicities and Basicities of Isochalcogenourea Catalysts

Angewandte Chemie International Edition, Volume 64, Issue 48, November 24, 2025.
Incorporation of different chalcogen atoms allows for the fine‐tuning of nucleophilicity and basicity of commonly used isochalcogenourea organocatalyst scaffolds. Kinetic and thermodynamic descriptors for the molecular properties of the catalysts are introduced as tools to predict their efficiency and tested in acyl transfer and allenoate activation ...
Lotte Stockhammer, Kevin Kasten, Andreas Eitzinger, Lukas S. Vogl, Magdalena Piringer, David Weinzierl, Armin R. Ofial, Andrew D. Smith, Mario Waser   +8 more
wiley   +1 more source