Results 31 to 40 of about 2,936 (205)

Pd(II)-catalyzed enantioselective C(sp3)–H arylation of cy-clopropanes and cyclobutanes guided by tertiary alkyla-mines.

open access: yes, 2021
: Strained aminomethyl-cycloalkanes are a recurrent scaffold in medicinal chemistry due to their unique structural features that give rise to a range of biological properties.
Javier, Miro   +3 more
core   +1 more source

Ring Tension, Hydrocarbon Acidity, and New «Super-Bases»

open access: yesCHIMIA, 1986
Addition of disodium pinacolate or, particularly, potassium tert-butoxide considerably increases the transmetalating power of pentylsodium. A hexane slurry of such «NACNAOR» or «NACKOR» reagent mixtures readily and selectively converts 3,3-dimenthyl-1 ...
Manfred Schlosser   +5 more
doaj   +1 more source

r-1,t-3-Bis[4-(dimethylamino)phenyl]-c-2,t-4-bis(pyridin-4-yl)cyclobutane

open access: yesActa Crystallographica Section E, 2014
The title compound, C30H32N4, was synthesized by the photodimerization of trans-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridine in benzene upon irradiation with UV light.
Shuguang Zhang, Junpeng Zhuang
doaj   +1 more source

Anethole Isomerization and Dimerization Induced by Acid Sites or UV Irradiation

open access: yesMolecules, 2010
The formation of cis-anethole and various dimers as a result of the exposure of trans-anethole to microporous solid acids (dealuminated HY zeolites), or UV-Vis irradiation was established by means of high resolution gas chromatography coupled to mass ...
Elena Stashenko   +2 more
doaj   +1 more source

Elimination versus ring opening: A convergent route to alkylidene- cyclobutanes

open access: yes, 2011
International audienceFunctionalized alkylidene-cyclobutanes have been prepared from 2-fluoropyridinyl-6-oxy precursors derived from vinyl cyclobutanols by a radical addition-elimination process.
Michal Michalak   +7 more
core   +1 more source

Elimination versus Ring Opening: A Convergent Route to Alkylidene-Cyclobutanes

open access: yes, 2016
Functionalized alkylidene-cyclobutanes have been prepared from 2-fluoropyridinyl-6-oxy precursors derived from vinyl cyclobutanols by a radical addition–elimination process.
Béatrice Quiclet-Sire (1672969)   +3 more
core   +1 more source

Electrochemical Cycloaddition Reactions of Alkene Radical Cations: A Route toward Cyclopropanes and Cyclobutanes

open access: yes, 2023
Herein, we describe a mild and efficient electrochemicalmethod for cycloaddition reactions of alkene radicalcations. Anodic oxidation of olefins produces electrophilic alkeneradical cations, which further react with either diazo compounds ina [2 + 1]
Kowaluk Agnieszka   +3 more
core   +3 more sources

[2+2]-Photocycloadditions of 1,4-Naphthoquinone Under Batch and Continuous-Flow Conditions

open access: yesMolecules
A series of [2+2]-photocycloadditions of 1,4-naphthoquinone with various alkenes and diphenylacetylene were investigated under batch and continuous-flow conditions.
Madyan A. Yaseen   +3 more
doaj   +1 more source

Reversible photoswitching of the DNA-binding properties of styrylquinolizinium derivatives through photochromic [2 + 2] cycloaddition and cycloreversion

open access: yesBeilstein Journal of Organic Chemistry, 2020
It was demonstrated that styrylquinolizinium derivatives may be applied as photoswitchable DNA ligands. At lower ligand:DNA ratios (≤1.5), these compounds bind to duplex DNA by intercalation, with binding constants ranging from Kb = 4.1 × 104 M to 2.6 ...
Sarah Kölsch   +4 more
doaj   +1 more source

Recent advances in the application of [2 + 2] cycloaddition in the chemical synthesis of cyclobutane-containing natural products

open access: yesNatural Products and Bioprospecting
Cyclobutanes are distributed widely in a large class of natural products featuring diverse pharmaceutical activities and intricate structural frameworks.
Song-Yu Hou   +3 more
doaj   +1 more source

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