Online Encyclopedia


Online Encyclopedia
Originally appearing in Volume V19, Page 168 of the 1911 Encyclopedia Britannica.
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C NAPHTHALENE,oH8, a hydrocarbon discovered in the " carbolic " and " heavy oil " fractions of the coal-tar distillate (see COAL-TAR) in 1819 by A. Garden. It is a product of the action of heat on many organic compounds, being formed when the vapours of ether, camphor, acetic acid, ethylene, acetylene,, &c., are passed through a red-hot tube (M. Berthelot, Jahresb., 1851), or when petroleum is led through a red-hot tube packed with charcoal (A. Letny, Ber., 1878, II, p. 1210). It may be synthesized by passing the vapour of phenyl butylene bromide over heated soda lime (B. Aronheim, Ann., 1874, 171, p. 219); and by the action of ortho-xylylene bromide on sodium ethane tetracarboxylic ester, the resulting tetra-hydronaphthalene tetracarboxylic ester being hydrolysed and heated, when it yields hydronaphthalene dicarboxylic acid, the silver salt of which decomposes on distillation into naphthalene and other products (A. v. Baeyer and W. H. Perkin, junr., Ber., 1884, 17, P. 451): C6H4 End of Article: C NAPHTHALENE

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