Results 101 to 110 of about 6,809 (215)
A quantitative approach to nucleophilic organocatalysis
Beilstein Journal of Organic Chemistry, 2012 The key steps in most organocatalytic cyclizations are the reactions of electrophiles with nucleophiles. Their rates can be calculated by the linear free-energy relationship log k(20 °C) = sN(E + N), where electrophiles are characterized by one parameter
Herbert Mayr +3 more
doaj +1 more source
European Journal of Organic Chemistry, Volume 29, Issue 28, 25 July 2026.The allenyl ketone products of an enol ether formation–propargyl Claisen rearrangement sequence are susceptible to acid‐catalyzed isomerization to yield the corresponding conjugated dienones. A diaryl thiourea catalyst was found to promote the desired reaction sequence while suppressing the competing isomerization.
Veera K. Bruce‐Salmenkivi +3 more
wiley +1 more source
Cross-trienamines in Asymmetric Organocatalysis [PDF]
, 2015 Cross-conjugated trienamines are introduced as a new concept in asymmetric organocatalysis. These intermediates are applied in highly enantioselective Diels–Alder and addition reactions, providing functionalized bicyclo[2.2.2]octane compounds and γ ...
Karl Anker Jørgensen (1287900) +5 more
core +1 more source
Enantiopure cycloalkane fused tetrahydropyrans through domino Michael-ketalizations with organocatalysis [PDF]
, 2009 Enantiopure cyclohexane fused tetrahydropyrans have been synthesized using domino Michael-ketalization under ...
Chandrasekhar, Srivari +4 more
core +1 more source
Beilstein Journal of Organic Chemistry, 2016 Hydrogen bond donor catalysis represents a rapidly growing subfield of organocatalysis. While traditional hydrogen bond donors containing N–H and O–H moieties have been effectively used for electrophile activation, activation based on other types of non ...
Pavel Nagorny, Zhankui Sun
doaj +1 more source
Self‐Complementary Dimers Based on Zwitterionic Halogen Bond Donors
Chemistry – A European Journal, Volume 32, Issue 27, 17 July 2026.In this study we present the first isolated zwitterionic homodimers based on halogen bonding (XB). After optimization of the structures by changing the Lewis base (LB) and the backbone, their dimerization was observed in gas phase, as well as, in solid state.
Dana Kutzinski +5 more
wiley +1 more source
Annual Reports Section "B" (Organic Chemistry), 2011 Benjamin R. Buckley, Mohamed M. Farah
openaire +2 more sources
Synthesis of Benzopyran Atropisomers via Electrophilic Halogenation
European Journal of Organic Chemistry, Volume 29, Issue 27, 17 July 2026.We report a halogenation‐based method for the synthesis of axially chiral benzopyrans, tolerating diverse substituents and halogens (Br, Cl, and I). A double bromination gives bisbenzopyrans with two stereogenic axes. Preliminary enantioselective conditions yield benzopyran atropisomer with up to 56% ee.
Alix Bourhis +3 more
wiley +1 more source
Synthesis of tetrathia[7]helicene based phosphorus derivatives [PDF]
, 2012 Tetrathia[7]helicenes (7-TH) are polyconjugated π-systems in which four thiophene rings are orthofused to alternating arene rings to generate a non planar, chiral, stable helix which allows the existence of M and P enantiomers.
E. Licandro +3 more
core
Tetrahedron ChemChiral Lewis base (LB) organocatalysis has emerged as a powerful covalent catalysis concept which allows for highly selective asymmetric C–C and C-heteroatom bond formations.
Magdalena Piringer +5 more
doaj +1 more source