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Quinolizidine and indolizidine alkaloids isolated fiom tunicates.

Quinolizidine and indolizidine alkaloids isolated from tunicates.

Quinolizidine ring structure

Quinolone and antibacterial 4-quinolones. Note that the newer fluoroquine derivatives have a 6-fluoro and a 7-piperazino substituent. Drugs marked with an asterisk are difluorinated quinolones, with a second fluorine atom at C-8.

Quinolones and fluoroquinolones.

Quinolones containing a piperazinyl residue.

Quinone catalysts.

Quinone classes upon which fungicides can be based.

Quinone hydroquinone velcrands from the Diederich group

Quinone ketal route to intermediate 30.

Quinone methide and vinyl ether formation from free-phenolic lignin units.

Quinone monoimine in reaction with a dialkyl phosphite.

Quinone reconstitution and herbicide binding to PS I reaction center

Quinone redox cycling. A substituted catechol is shown as an example. Adapted from Squadrito, G. L., Cueto, R., Dellinger, B., and Pryor, W. A. Free Radic. Biol. Med. 31, 1132-1138, 2001.

Quinone reduction promoted by hydrogen-bond dona s

Quinone-acetogenin hybrids .

Quinone-iminium dye generated through an oxidative coupling reaction

Quinone-receptor porphyrin .

Quinone-receptor porphyrin left and metalloporphyrin right .

Quinonemethide route to functionalized calixarenes.

Quinones and cyclohexa-2,5-dienimines via Hofmann-type rearrangements

Quinones and quinoid compounds

Quinones as oxidising reagents.

Quinones from Dalbergia and Acacia species .

Quinones from higher plants.



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