Noun:

க்யூனோனில்,

quinones's Usage Examples:

Hausen BM (1978) Sensitizing capacity of naturally occurring quinones.

aminoand oxy-benzenes, aminophenols, quinones, and oxycarboxylic acids.

For naphthalene quinones see Naphthalene; for anthracene quinone see Anthraquinone; and for phenanthrene quinone see Phena Nt H Rene.

This replacement may take place either in the ortho or para positions, giving rise to orthoquinones or to paraquinones; metaquinones do not appear to have been isolated.

The para or true quinones are obtained by the oxidation of hydrocarbons with chromic acid or of various para di-derivatives of benzene with chromic acid mixture, such, for example, as para-aminophenol, para-phenylene diamine, paraa.

1787) have disputed the correctness of this explanation, and the latter has prepared melliteins and pyromelliteins, which are highly-coloured compounds produced from mellitic and pyromellitic acids, and which cannot be formulated as quinones.

Certain a-diketones condense to form benzenoid quinones, two molecules of the diketone taking part in the reaction; thus diacetyl, CH 3 CO CO CH 3, yields p-xyloquinone, C 6 H 2 (CH 3) 2 0 2 (Ber.

Bamberger), and by the action of the Grignard reagent on quinones (Bamberger).

The trioxyanthraquinones - purpurin, anthrapurpurin, anthragallol and flavopurpurin - are also very valuable dyestuffs.

When treated with hydrochloric acid and potassium chlorate, no chlorinated quinones are obtained (M.

, and is decomposed at a higher temperature into chromium sesquioxide and oxygen; it is a very powerful oxidizing agent, acting violently on alcohol, converting it into acetaldehyde, and in glacial acetic acid solution converting naphthalene and anthracene into the corresponding quinones.

The more complex phenazines, such as the naphthophenazines, naphthazines and naphthotolazines, may be prepared by condensing ortho-diamines with ortho-quinones (0.

Several potentially allergenic quinones are also present in the wood (Sandermann et al.

Synonyms:

chemical compound, ubiquinone, coenzyme Q, benzoquinone, compound,

Antonyms:

smooth, rough, simple, decrease, disintegrate,