quinaldine quinaldine quinaldine or 2-methylquinoline is an organic compound with the formula ch3c9h6n. it is one of the methyl derivatives of the heterocyclic compound quinoline. it is bioactive and is used in the preparation of various dyes. it is a colorless oil but commercial samples can appear colored. quinaldine names preferred iupac name 2-methylquinoline other names quinaldine, α-methylquinoline, chinaldine, khinaldin identifiers cas number 91-63-4 y 3d model (jsmol) interactive image chebi chebi:132813 chembl chembl194931 y chemspider 13870160 y echa infocard 100.001.896 ec number 202-085-1 pubchem cid 7060 unii dvg30m0m87 y comptox dashboard (epa) dtxsid3040271 inchi inchi=1s/c10h9n/c1-8-6-7-9-4-2-3-5-10(9)11-8/h2-7h,1h3 ykey: smuqfggvlnaioz-uhfffaoysa-n yinchi=1/c10h9n/c1-8-6-7-9-4-2-3-5-10(9)11-8/h2-7h,1h3 smiles cc1nc2ccccc2cc1 properties chemical formula c10h9n molar mass 143.19 g/mol appearance colorless oil density 1.058 g/cm3 melting point −2 °c (28 °f; 271 k) boiling point 248 °c (478 °f; 521 k) solubility in water insoluble hazards ghs labelling: pictograms signal word warning hazard statements h302, h312, h319 precautionary statements p264, p270, p280, p301+p312, p302+p352, p305+p351+p338, p312, p322, p330, p337+p313, p363, p501 nfpa 704 (fire diamond) 2 2 0 flash point 79 °c (174 °f; 352 k) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references production and reactions quinaldine is recovered from coal tar. it can be prepared from aniline and paraldehyde via skraup synthesis or from aniline and crotonaldehyde via doebner-von miller variation of the skraup reaction. hydrogenation of quinaldine gives 2-methyltetrahydroquinoline. this reduction can be conducted enantioselectively. properties quinaldine has critical point at 787 k and 4.9 mpa and its refractive index is 1.8116. uses quinaldine is used in manufacturing anti-malaria drugs, dyes and food colorants (e.g., quinoline yellows, pinacyanol). it is the precursor to the ph indicator quinaldine red. quinoline yellow is a popular dye derived from quinaldine. quinaldine red, a ph indicating dye. quinaldine sulfate is an anaesthetic used in fish transportation. in some caribbean islands it is used to facilitate the collection of tropical fish from reefs.