Journal ArticleDOI
Synthesis of 4-substituted-3-alkoxy-3-cyclobutene-1,2-diones
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Les composes du titre sont prepared par addition d'organolithiens sur des dialcoxy-3,4 cyclobutene-3diones-1,2, suivie de l'addition d'anhydride trifluoroacetique as mentioned in this paper.Abstract:
Les composes du titre sont prepares par addition d'organolithiens sur des dialcoxy-3,4 cyclobutene-3diones-1,2, suivie de l'addition d'anhydride trifluoroacetiqueread more
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Journal ArticleDOI
Halochromic and hydrochromic squaric acid functionalized perylene bisimide.
TL;DR: The functionalization of perylene bisimide by squaric acid afforded halochromic dyes with pronounced acidity through the intramolecular charge transfer between perylene and cyclobutene cores initiated by protonation/deprotonation.
Journal ArticleDOI
Convergent Synthesis of Azabicycloalkenones using Squaric Acid as Platform
TL;DR: In this article, the synthesis of azabicycloalkenones bearing a vinylogous amide moiety was achieved by means of the rhodium-catalyzed decarbonylative cycloaddition of cyclobutenediones with a pendant alkene.
Journal ArticleDOI
PhI(OAc)2-Promoted Rearrangement of the Hydroxyl Group: Ring Expansion of 4-Hydroxy-2-cyclobutenone to 2(5H)-Furanone in Comparison with Ring Cleavage of the α-Hydroxycycloalkanone to the ω-Formyl Ester
TL;DR: In this paper, the reaction of 4-hydroxy-2-cyclobutenones with PhI(OAc)2 in 1,2-dichloroethane at reflux temperature gave rise to 5-acetoxy-2(5H)-furanones as a rearranged product, formation of which was explained by ring cleavage of the once formed hypervalent iodine intermediate and following recycling of the resulting acyl cation with a carbonyl oxygen.
Journal ArticleDOI
Synthesis of indolizine-5,8-diones and [3.2.2]cyclazines
TL;DR: In this article, the thermally induced ring expansion of 4-(1-pyrrolyl)-4-trimethylsiloxycyclobutenones to 5-hydroxy-8 trimethyl-siloxyindolizines and their subsequent oxidation to the rare indolizine-5,8-diones is described.