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

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...

or diethyl ether. The radical 2 forms a chemical equilibrium with the quinoid-type dimer 3 (Gomberg's dimer). In benzene the concentration of the radical...

by absorbing light in the visible region (some examples are nitro, azo, quinoid groups) and an auxochrome which serves to deepen the color. This theory...

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

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

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

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

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...

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