Quinoline's introduce

Quinoline, also known as 1-azanaphthalene, 1-benzazine, or benzo[b]pyridine, is a heterocyclic aromatic organic compound. It has the formula C₉H₇N and is a colourless hygroscopic liquid with a strong odour. Aged samples, if exposed to light, become yellow and later brown. Quinoline is only slightly soluble in cold water but dissolves readily in hot water and most organic solvents.

Quinoline is mainly used as a building block to other specialty chemicals. Approximately 4 tonnes are produced annually according to a report published in 2005. Its principal use is as a precursor to 8-hydroxyquinoline, which is a versatile chelating agent and precursor to pesticides. Its 2- and 4-methyl derivatives are precursors to cyanine dyes. Oxidation of quinonline affords quinolinic acid (pyridine-2,3-dicarboxylic acid), a precursor to the herbicide sold under the name "Assert".

The quinonline  dispart of 6-(Hydroxymethyl)-2-methylquinoline,1,2-Dihydro-1-methyl-2-oxoquinoline-4-carboxaldehy,2-Chloro-7-ethoxyquinoline-3-carboxaldehyde2,6-Dichloroquinoline-3-carboxaldehyde,2-Chloro-6-methylquinoline-3-carboxaldehyde6,7-Dimethoxyisoquinoline, N-(2-Aminoethyl)-5-chloroisoquinoline-8-sulphonami

1-Cyclohexyl-4-oxo-1,4-dihydroquinoline-3-carboxyl,6-Bromo-2-hydroxyquinoline-4-carboxylicacid,Biotinyl-6-aminoquinoline,1,3-Dichloroisoquinoline,5-Hydroxyisoquinoline,2-Aminoquinoline,8-Bromoisoquinoline  and so on!