Results 21 to 30 of about 136 (108)

Chemical novelty facilitates herbivore resistance and biological invasions in some introduced plant species

Ecology and Evolution, Volume 10, Issue 16, Page 8770-8792, August 2020., 2020
Ecological release from herbivory due to chemical novelty is predicted to facilitate biological invasions by plants, but has not been tested on a community scale. We used metabolomics to assess the chemical novelty of invasive plant species at a site in eastern North America.
Brian E. Sedio, John L. Devaney, Jamie Pullen, Geoffrey G. Parker, S. Joseph Wright, John D. Parker   +5 more
wiley   +1 more source

Fructose-catalyzed synthesis of tetrahydrobenzo[b]pyran derivatives: Investigation of kinetics and mechanism [PDF]

Chinese Journal of Catalysis, 2015
Abstract Fructose was used as an efficient catalyst for three-component condensation reactions of aryl aldehydes, malononitrile, and dimedone in a mixture of EtOH and H2O as green solvents. The advantages of this method are a short reaction time, high yields, low cost, easy accesses, and simple work-up.
Sayyedeh Shadfar Pourpanah, Sayyed Mostafa Habibi-Khorassani, Mehdi Shahraki   +2 more
openaire   +1 more source

Pentafluoropropionic Acid: An Efficient and Metal‐Free Catalyst for the One‐Pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives

Journal of Chemistry, Volume 2014, Issue 1, 2014., 2014
Pentafluoropropionic acid (PFPA) efficiently catalyzes the one‐pot, three‐component reaction of aromatic aldehyde, malononitrile, and dimedone to yield tetrahydrobenzo[b]pyran derivatives in high yields. This method is of great value because of its easy processing, short reaction time, environmentally, and high yields.
Naser Montazeri, Taghva Noghani, Mona Ghorchibeigy, Rozita Zoghi, Mohamed Afzal Pasha   +4 more
wiley   +1 more source

Synthesis of Fe 3 O 4 /Eggshell Nanocomposite and Application for Preparation of Tetrahydrobenzo[b]Pyran Derivatives

Iranica Journal of Energy and Environment, 2017
This work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of any stabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell nano-composite. The nanocompositeshave shown high catalytic activities in the synthesis of Tetrahydrobenzo[b]pyran. These derivatives were synthesized via an one‐pot three‐
M. Naghizadeh, P. Mohammadi, H. Sheibani, M. A. Taher   +3 more
openaire   +2 more sources

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

A Review on Green Synthetic Approaches in the Development of Quinoline Analogues

ChemistrySelect, Volume 11, Issue 33, 1 September 2026.
This review highlights recent advances in environmentally friendly approaches, including metal‐free systems, solvent‐free approaches, microwave, and ultrasonic‐assisted techniques, organo‐ and biocatalysis, ionic liquids, nanoparticle catalysis, electrochemical, and photocatalytic strategies for the synthesis of quinoline scaffolds.
Demis Zelelew, Ajay Bissessur, Parvesh Singh, Hogantharanni Govender   +3 more
wiley   +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