Results 21 to 30 of about 1,004,074 (357)

Sequential curing of amine-acrylate-methacrylate mixtures based on selective aza-Michael addition followed by radical photopolymerization [PDF]

open access: yes, 2016
Dual curing systems find various uses in industry with the process flexibility they provide which allows tailoring properties at different curing stages in accordance with application requirements. A safe and efficient dual curing scheme is proposed here
Fernández Francos, Xavier   +3 more
core   +1 more source

Asymmetric Sequential Michael Addition and Cyclization Reactions of 2-(2-Nitrovinyl)phenols Catalyzed by Bifunctional Amino-Squaramides

open access: yesSynOpen, 2021
In this work, we describe the Michael addition–cyclization reaction of 2-(2-nitrovinyl)phenol with two different reactive Michael donors, which lead to chiral benzopyran derivatives.
Eva Veverková   +2 more
doaj   +1 more source

Synthesis of Novel Michael Adducts and Study of their Antioxidant and Antimicrobial Activities [PDF]

open access: yesChemical Review and Letters, 2022
In the current study, the Michael addition reaction of nitromethane to chalcones were studied. 4-benzeloxy benzaldehyde was synthesized from 4-hydroxybenzaldehde and benzyl bromide, which was then converted to chalcone derivatives by reaction with ...
Shikar Sherzad Othman   +1 more
doaj   +1 more source

Age and size at maturity: sex, environmental variability and developmental thresholds [PDF]

open access: yes, 2004
In most organisms, transitions between different life-history stages occur later and at smaller sizes as growth conditions deteriorate. Day and Rowe recently proposed that this pattern could be explained by the existence of developmental thresholds ...
Andrew P. Beckerman   +5 more
core   +2 more sources

Divergent Pathways for Reactions of 3-Formylchromone with Cyclic Secondary Amines in Alcoholic Media

open access: yesSynOpen, 2019
Reaction of 3-formylchromone with cyclic secondary amines in methanol results in (E)-2-methoxy-3-(R2N-methylene)chroman-4-ones, while use of ethanol leads to (E)-2-morpholino-3-(morpholino­methylene)chroman-4-one or enaminoketones as dihydropyran ring ...
Kirill S. Korzhenko   +3 more
doaj   +1 more source

Synthesis of pyrrolizines by intramolecular capture of 1,4-dipolar intermediates in reactions of enamines with dimethyl acetylenedicarboxylate [PDF]

open access: yes, 1981
Solvent polarity and reaction temperature strongly influence the reactions of dimethyl acetylenedicar-boxylate (DMAD) with 1-pyrrolidinyl enamines of acyclic and cyclic ketones. Whereas DMAD and 1-[1-phenyl-2-(phenylthio)ethenyl]pyrrolidine (3) give only
Harkema, S.   +5 more
core   +3 more sources

Chiral Aminophosphines as Catalysts for Enantioselective Double-Michael Indoline Syntheses

open access: yesMolecules, 2012
The bisphosphine-catalyzed double-Michael addition of dinucleophiles to electron-deficient acetylenes is an efficient process for the synthesis of many nitrogen-containing heterocycles.
Ohyun Kwon, San N. Khong
doaj   +1 more source

Orthogonal protection of peptides and peptoids for cyclization by the thiol-ene reaction and conjugation [PDF]

open access: yes, 2014
Cyclic peptides and peptoids were prepared using the thiol-ene Michael-type reaction. The linear precursors were provided with additional functional groups allowing for subsequent conjugation: an orthogonally protected thiol, a protected maleimide, or an
Elduque Busquets, Xavier   +2 more
core   +2 more sources

A Convenient Base-Mediated Diastereoselective Synthesis of 2-Oxo-N,4,6-triarylcyclohex-3-enecarboxamides via Claisen-Schmidt Condensation [PDF]

open access: yesIranian Journal of Chemistry & Chemical Engineering, 2017
Sodium acetate catalyzed the multi-component reaction of acetophenone, aromatic aldehydes, and acetoacetanilide in the water-ethanol mixture (1:1) at ambient temperature via Claisen-Schmidt condensation results in the formation of highly substituted ...
Seyyed Rasul Mousavi
doaj  

Ethyl 2-[2-(4-Nitrobenzoyl)-1H-indol-3-yl]acetate

open access: yesMolbank, 2017
Ethyl 2-[2-(4-nitrobenzoyl)-1H-indol-3-yl]acetate was prepared in good yield and characterized by the aza-alkylation/intramolecular Michael cascade reaction of (E)-ethyl 3-[2-(tosylamino)phenyl]acrylate with 2-bromo-4′′-nitroacetophenone, followed by ...
Sunyoung Choi, Sung-Gon Kim
doaj   +1 more source

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