a compound, C6H5IO2, forming colourless needles and obtained by disproportionation of iodosobenzene.

A crystalline aromatic hydrocarbon occurring in coal tar and as a product of the breakdown of conifer resins.

spec. denoting the substitution of 3 methyl groups for 3 hydrogen atoms, in the substance designated by the rest of the name; e.g. trimethylbenzene n.…

= hydroquinone, n.

a volatile crystalline compound, C6H4Cl2, which has a penetrating odour and is used as a deodorizer and insecticidal fumigant, esp. in mothballs.

A colourless liquid, C8H6O, which may be distilled from coal-tar or synthesized, and which is structurally a benzene ring fused to a furan ring…

C4H4S, a colourless liquid with an odour like benzene, occurring in benzene from coal-tar to the extent of about 0.5 per cent.

The commercial name of a benzene derivative, C11H12N2O, used as an antipyretic: discovered in 1884 by L. Knorr, professor at Jena.

= methylthiophene, C4H3(CH3)S, a colourless oily compound, found as an impurity in crude toluene; two isomeric forms are known.

= dimethylthiophene, C4H2(CH3)2S, found as an impurity in xylene; there are several isomeric forms.

Each of three isomeric compounds with the formula C8H6O2, having two formyl groups bonded directly to a benzene ring; spec. the ortho isomer, a…

In trimesic acid, C6H3(CO2H)3, symmetrical benzene-tricarboxylic acid. (So named by Fittig, 1867, when he obtained it from mesitylenic acid, and…

used in Chemistry as combining form of iodous, adj. to indicate the presence of an IO group in a compound, as in iodosobenzene n. C6H5IO, a yellow…

Any compound whose molecule contains a benzene ring fused to a seven-membered ring containing two nitrogen atoms; spec. any of a group of such…