Results 21 to 30 of about 2,936 (205)
Molecules, 2019 The coupling of 2-bromo-3-benzoyloxycyclobutanone with purine under basic conditions produces two regioisomers consisting of the N-7 and N-9 alkylated products in equal amounts in their racemic forms.
Noha Hasaneen +8 more
doaj +1 more source
Molbank, 2021 The intermolecular [2 + 2]-photocycloaddition of the parent flavone molecule (4) as the triplet energy-accepting species and the electron-rich alkene 2, 3-dihydrofuran (5) was performed by visible-light-mediated triplet-sensitization with an iridium ...
Jens Lefarth +2 more
doaj +1 more source
Natural Product Communications, 2012 Optically active 1,3-bridged cyclobutanes 10 of the bicyclo[3.1.1]heptane ring system and 1,2-bridged cyclobutanes 11 of the bicyclo[3.2.0]heptane ring system were produced by UV irradiation of α,β,γ,δ-unsaturated esters 9a and 9c-f.
Kiyoshi Honda +6 more
doaj +1 more source
Reenvisioning the De Mayo Reaction: A Boron‐Enabled Cycloaddition Approach
Angewandte Chemie, EarlyView.An oxa‐boracycle conformational lock strategy enables photocatalytic [2+2] cycloaddition to afford densely substituted cyclobutylboronates. The conformational constraint suppresses triplet relaxation and promotes productive bimolecular reactivity.
Neetu Sharma +5 more
wiley +2 more sources
Functionalized Cyclobutanes via Heck Cyclization
, 2016 Heck-type 4-exo-trig cyclization of linear 2-enol triflate-1,5-hexadienes provides functionalized methylene cyclobutanes. Intramolecular palladium coordination can initiate β-hydride elimination leading to 1,2-dimethylene cyclobutane derivatives, which ...
Johann Mulzer (1297377) +2 more
core +2 more sources
The Formal [4+3] Cycloaddition between Donor−Acceptor Cyclobutanes and Nitrones
, 2016 The formal [4+3] cycloaddition of 2-alkoxy-1,1-dicarboxylate activated donor−acceptor cyclobutanes with nitrones is disclosed. The reaction forms structurally unique oxazepines in moderate to high yield with a wide scope of nitrones. In most cases either
Brian L. Pagenkopf (2222299) +2 more
core +5 more sources
Angewandte Chemie, EarlyView.Photocycloaddition in stilbene‐type salt polymorphs exhibit distinct light‐driven responses: OHT‐TI shows a violent photosalient effect under visible and NIR (two‐photon) irradiation, whereas OHT‐TII reacts statically. Packing and computational analysis reveals that shell‐like structures in OHT‐TI frustrate structural relaxation, accumulating explosive
Emanuela Santagata +10 more
wiley +2 more sources
Molecules, 2022 The ditopic halogen-bond (X-bond) donors 1,2-, 1,3-, and 1,4-diiodotetrafluorobenzene (1,2-, 1,3-, and 1,4-di-I-tFb, respectively) form binary cocrystals with the unsymmetrical ditopic X-bond acceptor trans-1-(2-pyridyl)-2-(4-pyridyl)ethylene (2,4-bpe ...
Jay Quentin +2 more
doaj +1 more source
, 2016 Enantiomerically enriched cyclobutanes are constructed by a three-component process in which t-butyl (E)-2-diazo-5-arylpent-4-enoates are treated with Rh2(S-NTTL)4 to provide enantiomerically enriched bicyclobutanes, which can subsequently engage in ...
Joseph M. Fox (1287015) +5 more
core +3 more sources
Mass Spectrometry and Gas-phase Ion Chemistry of Cyclobutanes
, 2005 Kuck D. Mass Spectrometry and Gas-phase Ion Chemistry of Cyclobutanes. In: Rappoport Z, Liebman JF, eds. The Chemistry of Functional Groups: The Chemistry of Cyclobutanes. The Chemistry of Functional Groups.
Liebman, Joel F. +2 more
core +1 more source