Results 21 to 30 of about 9,597,280 (150)

Ionic Liquids: Synthesis and Applications in Catalysis

Advances in Chemistry, Volume 2014, Issue 1, 2014., 2014
Ionic liquids have emerged as an environmentally friendly alternative to the volatile organic solvents. Being designer solvents, they can be modulated to suit the reaction conditions, therefore earning the name “task specific ionic liquids.” Though primarily used as solvents, they are now finding applications in various fields like catalysis ...
Rajni Ratti, Hideaki Shirota
wiley   +1 more source

Microwave‐Assisted Three‐Component “Catalyst and Solvent‐Free” Green Protocol: A Highly Efficient and Clean One‐Pot Synthesis of Tetrahydrobenzo[b]pyrans

Organic Chemistry International, Volume 2014, Issue 1, 2014., 2014
A green and highly efficient method has been developed for the one‐pot synthesis of tetrahydrobenzo[b]pyrans via a three‐component condensation of aldehydes, 1,3‐cyclic diketones, and malononitrile under MW irradiation without using any catalyst and solvent.
Sougata Santra, Matiur Rahman, Anupam Roy, Adinath Majee, Alakananda Hajra, Ashraf Aly Shehata   +5 more
wiley   +1 more source

An Efficient Synthesis of Tetrahydrobenzo[b]pyran Derivatives Using Sulfonic Acid Functionalized Silica as an Efficient Catalyst

Journal of Chemistry, Volume 8, Issue 1, Page 293-299, 2011., 2011
Tetrahydrobenzo[b]pyran derivatives were efficiently synthesized by the reaction of appropriated aromatic aldehydes, malononitrile and dimedone in the presence of SiO2‐Pr‐SO3H as a nanoporous and recoverable solid acid catalyst, in good to excellent yields.
Ghodsi Mohammadi Ziarani, Alireza Abbasi, Alireza Badiei, Zeinab Aslani   +3 more
wiley   +1 more source

An Efficient and Convenient Approach to Synthesis of Tetrahydrobenzo[b]pyran Derivatives Using Tetrabutylammonium Bromide as Catalyst

Journal of Chemistry, Volume 6, Issue S1, Page S466-S472, 2009., 2009
An efficient and convenient approach to the synthesis of 2‐amino‐3‐cyano‐4‐aryl‐7,7‐dimethyl‐5‐oxo‐4H‐5, 6, 7, 8‐ tetrahydro benzo[b]pyran derivatives using tetrabutylammonium bromide (TBABr) as the catalyst is described. This method provides several advantages such as neutral conditions, high yields and simple work procedure.
S. Gurumurthi, V. Sundari, R. Valliappan
wiley   +1 more source

Reactivity of Functionalized N,S-Ketene Acetal: Regioselective Construction of Tetrahydrobenzo[b]pyran and Chromeno[2,3-b]quinoline Derivatives

, 2016
Regioselective synthesis of functionalized tetrahydrobenzo[b]pyrans has been developed by multicomponent reactions (MCRs) and tandem [3 + 3] annulations of β-benzoylthioacetanilides or β-(2-haloaroyl)thioacetanilides as valuable sources with aromatic ...
Yan-Li Hou (313709), Ming Li (91180), Li-Rong Wen (1456753), Fu-Meng Gong (2243245)   +3 more
core   +2 more sources

Hydrochloric acid immobilized on nano‐titanium dioxide: a novel and efficient nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

, 2017
Hydrochloric acid was immobilized onto the surface of amine functionalized nano‐titania. For this purpose, 2,4‐toluene diisocyanate (TDI) as a bi‐functional covalent linker was grafted onto a nano‐titania and next, the unreacted isocyanate groups were ...
Taiebeh Shamsi, Ali Amoozadeh, Elham Tabrizian   +2 more
core   +1 more source

State‐of‐the‐Art, Insights, and Perspectives for MOFs‐Nanocomposites and MOF‐Derived (Nano)Materials

Advanced Materials, Volume 37, Issue 52, December 29, 2025.
Different approaches to MOF‐NP composite formation, such as ship‐in‐a‐bottle, bottle‐around‐the‐ship and in situ one‐step synthesis, are used. Owing to synergistic effects, the advantageous features of the components of the composites are beneficially combined, and their individual drawbacks are mitigated.
Stefanos Mourdikoudis, Subhajit Dutta, Saqib Kamal, Sergio Gómez‐Graña, Isabel Pastoriza‐Santos, Stefan Wuttke, Lakshminarayana Polavarapu   +6 more
wiley   +1 more source

One-pot synthesis of 2-amino-3-cyano-4-arylsubstituted tetrahydrobenzo[b]pyrans catalysed by silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst

, 2011
A convenient method for the synthesis of tetrahydrobenzo[b]pyrans by a one-pot three-component cyclocondensation of dimedone, aryl aldehydes, and malononitrile in water using silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and ...
Samineh Fazli, Abolghasem Davoodnia, Sadegh Allameh, Niloofar Tavakoli-Hoseini   +3 more
core   +1 more source

Steric Effects in Benzopyran Imine‐Hemiaminal Ring–Chain Tautomerism: Tautomeric Free Energies as a Measure of Substituent Size

ChemistrySelect, Volume 10, Issue 37, October 6, 2025.
Equilibrium constants for a series of substituted benzopyranamines were determined. The calculated free energies correlate with the steric size of the substituent and compare well with a previously reported series of benzofuranamines. X‐ray crystallographic data of examples from both series offers an understanding of the steric effects and lack of ...
Benjamin D. Cavilla, Tanis Huzil, Peter W. Dibble, René T. Boeré   +3 more
wiley   +1 more source

Cerium(III) chloride-catalyzed one-pot synthesis of tetrahydrobenzo[b]pyrans

, 2009
Efficient one-pot synthesis of 4H-benzo[b]pyrans via a three-component cyclocondensation of aryl aldehydes, malononitrile, and dimedone has been reported using CeCl3·7H2O as ...
Sudhakar, K., Sabitha, Gowravaram, Yadav, J. S., Arundhathi, K., Sastry, B. S.   +4 more
core   +1 more source