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QUINOID

Quinoid

Organic compounds derived from quinone

organic chemistry, quinoids are a class of chemical compounds that are derived from quinone. Unlike benzenoid structures, the quinoid part is not aromatic

Quinoid

Triphenylmethyl radical

Chemical compound

photoluminescence. Further reaction of the quinoid dimer with another triphenylmethyl radical produces a quinoid radical that exhibits red photoluminescence

Triphenylmethyl radical

Triphenylmethyl_radical

Meisenheimer complex

Class of organic compounds

and Gazzolo reacted trinitroanisole with sodium methoxide and proposed a quinoid structure for the reaction product. In 1902 Jakob Meisenheimer observed

Meisenheimer complex

Meisenheimer_complex

Gomberg's dimer

Chemical compound

which was prepared by Moses Gomberg in his quest for hexaphenylethane. Its quinoid structure has been determined by X-ray crystallography. The C-C bond that

Gomberg's dimer

Gomberg's_dimer

Benzenoid

Class of organic compounds

counterexamples are cyclooctadecanonaene, azulene and trans-bicalicene. Quinoid Aromatic compound Tomlinson, Muriel (1971). An Introduction to the Chemistry

Benzenoid

6,7-dihydropteridine reductase

Class of enzymes

1972). "Dihydropteridine reductase. Investigation of the specificity for quinoid dihydropteridine and the inhibition by 2,4-diaminopteridines". European

6,7-dihydropteridine reductase

6,7-dihydropteridine_reductase

Primula denticulata

Species of flowering plant

denticulata is known to contain the contact allergens primin and other quinoid compounds. Colour forms Wikimedia Commons has media related to Primula

Primula denticulata

Primula_denticulata

Frangula purshiana

Species of buckhorn shrub

such as digoxin, warfarin, corticosteroids, and diuretic agents. Numerous quinoid phytochemicals are present in cascara bark. The chemicals possibly contributing

Frangula purshiana

Frangula_purshiana

Viologen

Redox-active bipyridinium derivative

4'-viologens and green for 2,2'-derivatives. The second reduction yields a yellow quinoid compounds: [V]+ + e− ↽ − ⇀ {\displaystyle {\ce {<=>>}}} [V]0 The electron

Viologen

Alkylidene ketene

Photolysis of 3-diazobenzofuranone to make ketene and o-quinoid methyleneketene

Alkylidene ketene

Alkylidene_ketene

Indigoidine

Chemical compound

the stated symmetrical structure. Because of the nitrogen atoms in the quinoid rings, indigoidine is classified as azaquinones. A derivative is the violet

Indigoidine

QDPR

Human gene

QDPR (quinoid dihydropteridine reductase) is a human gene that produces the enzyme quinoid dihydropteridine reductase. This enzyme is part of the pathway

QDPR

Bipolaron (chemistry)

Class of chemical compound

dication. Structure 2a is a (singlet) diradical and 2b is the closed shell quinoid. The experimental bond lengths for the central vinylidene group in 2 are

Bipolaron (chemistry)

Bipolaron_(chemistry)

Lipid

Substance of biological origin that is soluble in nonpolar solvents

PMID 17349800. Brunmark A, Cadenas E (1989). "Redox and addition chemistry of quinoid compounds and its biological implications". Free Radical Biology & Medicine

Lipid

Tetramethylphenylenediamine

Chemical compound

the C-N(CH3)2 and the HC---CH bonds, indicating that oxidation gives a quinoid-like species. The monocation illustrates an early step in the oxidation

Tetramethylphenylenediamine

Lysimachia vulgaris

Species of flowering plant in the primrose family Primulaceae

vitro antifungal and cytotoxic activity of triterpene saponosides and quinoid pigments from Lysimachia vulgaris L. Phytotherapy Research 12: S70–S73

Lysimachia vulgaris

Lysimachia_vulgaris

Chromosome 4

Human chromosome

domain 2 PSAPL1: encoding protein Prosaposin-like 1 (gene/pseudogene) QDPR: quinoid dihydropteridine reductase RBM47: RNA binding motif protein 47 RG9MTD2:

Chromosome 4

Chromosome_4

Schiff test

Organic chemistry named reaction

appear colored due to the visible wavelength absorbance of its central quinoid structure—see also for example viologen —but are "decolorized" upon sulfonation

Schiff test

Schiff_test

Hammett equation

Free-energy relationship in organic chemistry

where, in a para substituted arene 1a, one resonance structure 1b is a quinoid with positive charge on the X substituent, releasing electrons and thus

Hammett equation

Hammett_equation

Alcohol dehydrogenase

Group of dehydrogenase enzymes

further class of alcohol dehydrogenases belongs to quinoenzymes and requires quinoid cofactors (e.g., pyrroloquinoline quinone, PQQ) as enzyme-bound electron

Alcohol dehydrogenase

Alcohol_dehydrogenase

Serine hydroxymethyltransferase

InterPro Family

simultaneously forming a carbinolamine intermediate on the THF and a quinoid intermediate with the PLP. However, THF is not an obligate substrate for

Serine hydroxymethyltransferase

Serine_hydroxymethyltransferase

Poly-N-(3-sulfopropyl)aniline

Water-soluble self-doped conducting polyaniline derivative

are converted to sodium sulfonates (–SO3Na) and the backbone acquires a quinoid-rich structure. Four-probe conductivity drops to approximately 6 × 10−5

Poly-N-(3-sulfopropyl)aniline

Parylene

Chemical compound

two quantum mechanical states, the benzoid state (triplet state) and the quinoid state (singlet state). The triplet state is effectively the initiator and

Parylene

Ornithine decarboxylase

Class of enzymes

form a Schiff base attached to orthonine, which decarboxylates to form a quinoid intermediate. This intermediate rearranges to form a Schiff base attached

Ornithine decarboxylase

Ornithine_decarboxylase

Moses Gomberg

American chemist (1866–1947)

hexaphenylethane (5). However this structure was later disproven in favor of the quinoid dimer (3). At the end of his first report of trivalent carbon "On Trivalent

Moses Gomberg

Moses_Gomberg

Cystathionine beta-lyase

Enzyme

The released lysine can now abstract the proton from the Cα and form a quinoid intermediate, which is facilitated by the delocalization of the negative

Cystathionine beta-lyase

Cystathionine_beta-lyase

Coniocarpon

Genus of lichen-forming fungi

lichens. This genus is distinct for its crystalline orange, red, and purple quinoid pigments in the ascomata that turn purple in potassium hydroxide solution

Coniocarpon