Results 91 to 100 of about 66,029 (249)

Growth of Fullerene Fragments Using the Diels-Alder Cycloaddition Reaction: First Step towards a C60 Synthesis by Dimerization

Molecules, 2013
Density Functional Theory has been used to model the Diels-Alder reactions of the fullerene fragments triindenetriphenilene and pentacyclopentacorannulene with ethylene and 1,3-butadiene.
Julio A. Alonso, Martha Mojica, Francisco Méndez   +2 more
doaj   +1 more source

Photochemical Approaches to Complex Chemotypes: Applications in Natural Product Synthesis. [PDF]

, 2016
The use of photochemical transformations is a powerful strategy that allows for the formation of a high degree of molecular complexity from relatively simple building blocks in a single step. A central feature of all light-promoted transformations is the
Kärkäs, Markus D., Porco, John A., Stephenson, Corey R.J.   +2 more
core   +2 more sources

Enantio- and Periselective Nitroalkene Diels-Alder Reactions Catalyzed by Helical-Chiral Hydrogen Bond Donor Catalysts

Molecules, 2013
Helical-chiral double hydrogen bond donor catalysts promote the nitroalkene Diels-Alder reaction in an enantio- and periselective manner. This represents the first asymmetric catalytic nitroalkene Diels-Alder reaction via LUMO-lowering catalysis. To gain
Zhili Peng, Maurice J. Narcis, Norito Takenaka   +2 more
doaj   +1 more source

Fully Selective Synthesis of Spirocyclic-1,2-oxazine N-Oxides via Non-Catalysed Hetero Diels-Alder Reactions with the Participation of Cyanofunctionalysed Conjugated Nitroalkenes [PDF]

, 2023
Przemysław Woliński, Agnieszka Kącka‐Zych, Aneta Wróblewska, Ewelina Wielgus, Rafał Dolot, Radomir Jasiński   +5 more
openalex   +1 more source

Estudos sobre o uso do NbCl5 como ácido de Lewis em reações de Povarov

Orbital: The Electronic Journal of Chemistry, 2011
RESUMO: O objetivo deste trabalho foi investigar o uso de NbCl5 como ácido de Lewis em reações de cicloadição (Reação Aza-Diels-Alder (Povarov)) entre bases de Schiff e éteres enólicos.
Luiz Carlos Silva-Filho, Mayara Frenhe
doaj   +1 more source

Combining 3D printing and liquid handling to produce user-friendly reactionware for chemical synthesis and purification [PDF]

, 2013
We use two 3D-printing platforms as solid- and liquid-handling fabricators, producing sealed reactionware for chemical synthesis with the reagents, catalysts and purification apparatus integrated into monolithic devices.
Cronin, Leroy, Dragone, Vincenza, Kitson, Philip J., Symes, Mark D.   +3 more
core   +1 more source

4,5,12,13-Tetrabromo[2.2]paracyclophane - A New Bis(aryne) Equivalent [PDF]

, 1993
The reaction of 2 with nBuLi at -78°C generates aryne intermediates within the aromatic rings of [2.2]paracyclophane which are trapped in Diels-Alder reactions with dienes like furan, 1,9-diphenylisobenzofuran, or cyclopentadiene. Reductive deoxygenation
Knieriem, Burkhard, König, Burkhard, Meijere, Armin de, Rauch, K.   +3 more
core   +1 more source

Anthracen- und Anthrachinon-Oligomere mit ortho-Cyclophanverknüpfung durch wiederholte Diels-Alder-Reaktion von 1,2,5,6-Tetra-exo-methylencyclooctan

CHIMIA, 1988
The design of efficient organic electron acceptors requires oligomeric and polymeric hydrocarbons in which separate redox-active units are connected in a sterically variable fashion.
Manfred Wagner, Werner Wohlfarth, Klaus Müllen   +2 more
doaj   +1 more source

Synthesis of (±)-Panduratin A and Related Natural Products Using the High Pressure Diels-Alder Reaction

, 2013
Panduratin A and 4-hydroxypanduratin A are synthesised in 6 steps via a high pressure Diels-Alder reaction. This sequence has also allowed the synthesis of isopanduratin A, 4-hyrdoxyisopanduratin A, panduratin H, and panduratin I.
Coote, Michelle, de la Cruz, Laura, Ho, Junming, McLeod, Malcolm D., Otting, Gottfried, Pasfield, Luke A.   +5 more
core   +1 more source

On the Question of the Course of the Hetero Diels–Alder Reactions Between N-(2,2,2-Trichloroethylidene)Carboxamides and Dicyclohexylcarbodiimide: A New Case of the Stepwise Zwitterionic Cycloaddition Process

Molecules
The regioselectivity and the molecular mechanism of the Diels–Alder reactions between N-(2,2,2-trichloroethylidene)carboxamides and dicyclohexylcarbodiimide were explored based on the ωB97xd/6-311G(d) (PCM) calculations.
Przemysław Woliński, Karolina Zawadzińska-Wrochniak, Ewa Dresler, Radomir Jasiński   +3 more
doaj   +1 more source