Results 41 to 50 of about 6,329 (228)
2-Thiabicyclo[3.2.0]-hepta-3,6-dienes. 2. Thermal and photochemical isomerization of 2-thiabicyclo[3.2.0]hepta-3,6-dienes. An example of the antarafacial-antarafacial Cope rearrangement [PDF]
, 1982 Thermal Rearrangement of 2-3.2.0] hepta-3,6-Diene-6,7-Dicarbonitrile8 1–3 to their 4,5-Dicarbonitrile Isomers 4–6 Takes Place at 110–140 °C in Yields of 82–84%.
Hall, Richard H. +2 more
core +3 more sources
Thiosulfonate‐Derived BODIPY “Stick and Glue” Strategy for Fluorescent Thiol Labeling
Angewandte Chemie International Edition, EarlyView.We present a powerful photochemical strategy for converting disulfide bonds into stable thioether linkages via a [1,2]‐sigmatropic rearrangement. By integrating this reaction into traditional methanethiosulfonate‐based thiol labeling, we enable light‐triggered stabilization of peptide and protein conjugates with enhanced robustness and versatility ...
Lucie Šálková +4 more
wiley +1 more source
Rhodium-Catalyzed (5+1) Annulations Between 2-Alkenylphenols and Allenes: A Practical Entry to 2,2-Disubstituted 2H-Chromenes [PDF]
, 2015 NOTICE: This is the peer reviewed version of the following article: Casanova, N., Seoane, A., Mascarelas, J. L., Gulías, M. (2015), Rhodium-Catalyzed (5+1) Annulations Between 2-Alkenylphenols and Allenes: A Practical Entry to 2,2-Disubstituted 2H ...
Casanova González, Noelia +3 more
core +2 more sources
Alkynyltriazenes in Photochemical Metal‐Free Doyle–Kirmse Rearrangements
Angewandte Chemie International Edition, EarlyView.A metal‐ and additive‐free photocatalytic Doyle–Kirmse reaction of alkynyl triazenes is described, proceeding via cyanocarbene intermediates. This strategy enables the efficient construction of highly substituted asymmetric carbon centers with broad substrate scope, delivering synthetically valuable nitriles.
Ningning Liu +7 more
wiley +1 more source
Beilstein Journal of Organic Chemistry, 2017 It has been proposed that elemanes are biogenetically formed from germacranes by Cope sigmatropic rearrangements. Normally, this reaction proceeds through a transition state with a chair conformation.
José Enrique Barquera-Lozada +1 more
doaj +1 more source
, 2017 We call iodabenzene a cyclic (CH)5I molecule. A planar iodabenzene would have 8 π electrons, a situation best avoided by an out-of-plane distortion to a bird-like geometry.
Chakkingal Parambil, Priyakumari +3 more
core +1 more source
Photoswitching of Dihydroazulene Derivatives in Liquid-Crystalline Host Systems [PDF]
, 2017 Photoswitches and dyes in the liquid-crystalline nematic phase have the potential for use in a wide range of applications. A large order parameter is desirable to maximize the change in properties induced by an external stimulus.
Cowling, Stephen J +7 more
core +1 more source
Chemistry – A European Journal, EarlyView.A donor–π–acceptor–π–donor (D–π–A–π–D) fluorophore bearing a U‐shaped dipyridophenazine core forms bifurcated hydrogen bonds with neutral donors such as sulfonamides or water. This interaction modulates both ground and excited states, enabling red‐shifted emission and enhanced photoluminescence in solution and solid state.
Kimiya Takei +7 more
wiley +1 more source
, 2016 The use of anti-relaxation coatings in alkali vapor cells yields substantial performance improvements by reducing the probability of spin relaxation in wall collisions by several orders of magnitude.
Balabas M. +12 more
core +1 more source
Multistep self-assembly of heteroleptic magnesium and sodium-magnesium benzamidinate complexes [PDF]
, 2010 Reaction of the magnesium bis-alkyl Mg(CH2SiMe3)(2) and the sodium amide NaHMDS (where HMDS = N(SiMe3)(2)) with benzonitrile yields the homometallic heteroleptic complex [PhC(NSiMe3)(2)Mg{mu-NC(CH2SiMe3)Ph}](2) (1).
Forret, Robert +4 more
core +1 more source