Results 91 to 100 of about 4,131 (247)

One-pot Multicomponent Synthesis of Novel Polyfunctionalized Pyridines

Sohag Journal of Sciences
: In this work, we synthesized a novel arylidene malononitrile 3 via the treatment of o -alkyl vanillin derivative 1 with malononitrile 2 in the presence of triethylamine (TEA) as a catalyst. The arylidene malononitrile 3 was subjected to react under one-
Hayam H Mohammed, Eman A. Ahmed, Bahgat R. M. Hussein, Omran Abdellah   +3 more
semanticscholar   +1 more source

Boronate‐Type‐Controlled Regioselective Catalytic [2 + 2 + 2] Cyclotrimerization for Synthesis of Polysubstituted 2‐ and 3‐Borylated Pyridines

ChemistryEurope, Volume 3, Issue 6, November 11, 2025.
Ring the boron, not the bell: cyclotrimerization of borylated diynes with nitriles using Co and Ru catalysts allows the efficient synthesis of a wide variety of borylated pyridines with high regioselectivity, paving the way for multiple post‐functionalizations.
Eva Bednářová, David Nečas, Rahamdil Usman, Anagha K. Satheeshkumar, Róbert Gyepes, Ivana Císařová, Marko Hapke, Martin Kotora   +7 more
wiley   +1 more source

The polyfunctionality of Coptic Egyptian relative complementisers

Proceedings of the International Conference on Head-Driven Phrase Structure Grammar, 2014
The present study is concerned with the complex ways in which alternating relative complementisers in Coptic are employed as a morphological flagging device for unbounded dependencies in various types of relative clause constructions and wh questions.
Berthold Crysmann, Chris H. Reintges
openaire   +3 more sources

Preparation of Enantioenriched Spirocyclic Scaffolds Transferring Axial Chirality from Borylalkylidenecycloalkanes

ChemistryEurope, Volume 3, Issue 6, November 11, 2025.
Enantiomerically enriched borylalkylidenecycloalkanes can transfer axial chirality to spirocyclic compounds with central chirality, without erosion of enantiomeric ratio. The method involves cyclopropanation, borylcyclopropanation, epoxidation, and aziridination reactions, that proceed in astereodivergent manner giving access to spirocycles with ...
Nerea Iragorri, Josebe Hurtado, Jose L. Vicario, Efraím Reyes, Elena Fernández   +4 more
wiley   +1 more source

Long-term perspectives on terrestrial and aquatic carbon cycling from palaeolimnology [PDF]

, 2015
Lakes are active processors and collectors of carbon (C) and thus recognized as quantitatively important within the terrestrial C cycle. Better integration of palaeolimnology (lake sediment core analyses) with limnological C budgeting approaches has the ...
Anderson, NJ, Edwards, ME, Jones, VJ, Langdon, PG, McGowan, S, Turner, S, van Hardenbroek, M, Whiteford, E, Wiik, E   +8 more
core   +4 more sources

Quantitative hopanoid analysis enables robust pattern detection and comparison between laboratories [PDF]

, 2015
Hopanoids are steroid-like lipids from the isoprenoid family that are produced primarily by bacteria. Hopanes, molecular fossils of hopanoids, offer the potential to provide insight into environmental transitions on the early Earth, if their sources and ...
Bialecka-Fornal, M., Conway, S. J., Kong, L., Kulkarni, G., Newman, D. K., Park, S., Thompson, A. L., Wu, C.-H.   +7 more
core   +2 more sources

Light Mediated Sulfonylation/C–H Activation/Annulation of Benzimidazoles Derivatives Catalyzed by Diarylmethylium Tetrafluoroborate Salts: An Experimental and Computational Study

Advanced Synthesis &Catalysis, Volume 367, Issue 20, October 29, 2025.
Through the exploiting of visible‐light, a key photoactive complex, and an acid‐catalyzed proton‐coupled electron transfer, polycyclic sulfonylated benzimidazoles are obtained through a domino process including sulfonylation, C–H activation, and annulation. Diarylmethylium tetrafluoroborates are employed as inexpensive organocatalyst capable of forming
Polyssena Renzi, Davide Cerrina, Emanuele Azzi, Giovanni Ghigo, Annamaria Deagostino   +4 more
wiley   +1 more source

Click Chemistry‐Enabled Synthesis of Diversely Functionalized Cyclobutenes

Asian Journal of Organic Chemistry, Volume 14, Issue 9, September 2025.
This work expands the synthetic scope of a [2 + 2] click chemistry cycloaddition between ethene‐1,1‐disulfonyl fluoride (EDSF) and a diverse library of alkynes to access 29 highly functionalized cyclobutenes. Substrate variation, including electron‐withdrawing and electron‐donating groups, enables precise regiocontrol.
Christopher J. Smedley
wiley   +1 more source

Design and Synthesis of Novel Antimicrobial Acyclic and Heterocyclic Dyes and Their Precursors for Dyeing and/or Textile Finishing Based on 2-N-Acylamino-4,5,6,7-tetrahydro-benzo[b]thiophene Systems

Molecules, 2011
A series of novel polyfunctionalized acyclic and heterocyclic dye precursors and their respective azo (hydrazone) counterpart dyes and dye precursors based on conjugate enaminones and/or enaminonitrile moieties were synthesized.
Rafat Milad Mohareb, Amira El-Sayed Mahmoud, Maher Helmy Helal, Hoda Zaki Shams   +3 more
doaj   +1 more source

Discovering new arene-catalyzed lithiations [PDF]

, 2010
La litiació catalitzada per hidrocarburs aromàtics és una metodologia útil i versàtil que promou els processos de litiació en condicions de reacció molt suaus.
Yus, Miguel
core