Results 111 to 120 of about 2,093,219 (268)

Stereoselective synthesis of α-methylenecyclopentenones via a Diels-Alder/retro-Diels-Alder protocol

, 2013
A new procedure for the stereoselective synthesis of cross-conjugated dienones is reported. This method makes use of the Diels–Alder adduct of anthracene and dimethyl fumarate, a precursor to a spirocyclopent-2-enone anthracene adduct as the key ...
Gedsirin Eksinitkun (20213058), Anthony C Willis (13590358), Stephen Pyne (19586047), Waya S Phutdhawong (20213061), Weerachai Phutdhawong (20144904)   +4 more
core  

Cyclopropylamine‐Derived Distonic Iminium Radicals: Photoinduced Strategies in Chemo‐ and Stereo‐Selective Synthesis

Chemistry – A European Journal, EarlyView.
Cyclopropylamines have emerged as powerful photocatalytic building blocks. Upon light‐induced single‐electron oxidation, they undergo strain‐release ring opening to generate distonic iminium radicals that enable diverse transformations, including ring‐opening functionalization, formal [3 + 2] cycloadditions, radical cascades, and asymmetric bond ...
Maria Chiara Cabua, Alberto Luridiana, Francesco Secci, Emanuele Cocco   +3 more
wiley   +1 more source

Experimental and Theoretical Approaches in the Study of Phenanthroline‐Tetrahydroquinolines for Alzheimer's Disease

ChemistryOpen, 2019
The imino‐Diels‐Alder reaction is one of the most common strategies in organic chemistry and is an important tool for providing a broad spectrum of biologically active heterocyclic systems. A combined theoretical and experimental study of the imino‐Diels‐
Dr. Yorley Duarte, Dr. Margarita Gutierrez, Dr. Rocío Álvarez, Dr. Jans H. Alzate‐Morales, Dr. Jorge Soto‐Delgado   +4 more
doaj   +1 more source

Diels-Alder adduktot és poli(w-pentadekalaktont) tartalmazó poliuretánok előállítása és vizsgálata

, 2018
A Diels-Alder adduktot és poli(w-dekalaktont) tartalmazó poliuretánok előállítása, s ezeknek fizikai illetve mechanikai vizsgálata.gjVegyészmérnökBSc ...
Nyirán, Tibor
core  

Mechanistic Insights Into Sustainable Catalytic Pyrolysis of Biomass‐Derived Ferulic Acid: The Role of Alumina Regeneration

Chemistry – A European Journal, EarlyView.
Surface‐bound ferulate phenolate complexes undergo styrene‐like polymerization on alumina, yielding a polymeric carbonaceous layer that progressively transforms into polyaromatic carbon domains with concomitant release of aromatic products, while parallel surface‐assisted decarboxylation produces 4‐vinylguaiacol. ABSTRACT A fundamental understanding of
Tetiana V. Kulik, Borys B. Palianytsia, Mykola M. Ilchenko, Nataliia S. Nastasiienko, David J. Morgan, Liudmila P. Storozhuk, David J. Willock, Greg Shaw, Duncan F. Wass, Rafael Luque, Philip R. Davies, Mykola T. Kartel   +11 more
wiley   +1 more source

Well‐Defined Nickel Precatalysts: Form, Function, and Application

Chemistry – A European Journal, EarlyView.
This review provides guidance on which nickel precatalysts to choose for a given application or which properties to prioritize in reaction development. A summary of the ease of synthesis, stability, diversity, accessibility, modularity, and general applicability is provided along with a related infographic.
Morgan E. John, George A. Koutsantonis, Reto Dorta, Scott G. Stewart   +3 more
wiley   +1 more source

Partially Biobased Polyurethanes With Reversibly Crosslinkable Furan Units Toward Recyclable Thermosetting Textile Fibres

Chemistry – A European Journal, EarlyView.
A molecular design strategy combines lignin‐derived aromatic units, sugar‐derived furan groups, and flexible glycol segments to create wet‐spinnable polyurethanes. Thermally reversible Diels–Alder crosslinking chemistry enables formation of crosslinked thermosetting fibers, repeated de‐crosslinking/re‐crosslinking cycles, and tunable fiber properties ...
Rafael N. L. Menezes, Fredrik Bäcklund, Tam T. Nguyen, Maria Maukonen, Zengwei Guo, Olga Gordivska, Cecilia Hansson, Baozhong Zhang   +7 more
wiley   +1 more source

Enantioselective Diels-Alder Reaction Catalyzed by G-Quadruplex DNA and Its Metalloenzyme

, 2012
Enantioselective Diels-Alder Reaction Catalyzed by G-Quadruplex DNA and Its ...
卢胜梅, 刘龑, 李英豪, 王长号, 周俊, 贾国卿, 李灿   +6 more
core  

Self‐Immolative Poly(Benzyl Ether)s: Design Principles and Controlled Depolymerization

Chemistry – A European Journal, EarlyView.
Unzipping to Sustainability: This Concept article explores the thermodynamic design of quinone‐methide (QM)‐based poly(benzyl ether)s (PBEs). It explains how a low ceiling temperature (Tc), QM stability, and an entropic gain drive rapid depolymerization (“unzipping”) of PBEs into monomers.
Ji Woo Kim, Yewon Kang, Hyungwoo Kim
wiley   +1 more source

Diels–Alder Versus Michael Adducts of 2‐Methylfuran and Maleate: Consecutive Synthetic Access to Both Product Types

European Journal of Organic Chemistry, EarlyView.
More than a century after Albrecht's original proposal, an unexpected synthetic relationship between the historically misassigned Michael adduct type and the genuine Diels–Alder product is revealed. Experimental and theoretical studies show that the Michael adduct is not formed directly from the diene and dienophile, but instead arises through ...
Johanna Buddeberg, Jianing Yang, Shuji Akai, Harald Gröger   +3 more
wiley   +1 more source