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1911 Encyclopedia Britannica
C12H10, a hydrocarbon isolated from the fraction of coal-tar boiling at 260°-270° by M. P. E. Berthelot, who, in conjunction with Bardy, afterwards synthesized it from a-ethyl naphthalene (Ann. Chem. Phys., 1873, vol. xxix.). It forms white needles (from alcohol), melts at 95° and boils at 278°. Oxidation gives naphthalic acid (1,8-naphthalene dicarboxylic acid).
Acenaphthalene, C12 H8, a hydrocarbon crystallizing in yellow tables and obtained by passing the vapour of acenaphthene over heated litharge. Sodium amalgam reduces it to acenaphthene; chromic acid oxidizes it to naphthalic acid.
FIG. 24. - Edison Accumulator.
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Chisholm, Hugh, General Editor. Entry for 'Acenaphthene'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/acenaphthene.html. 1910.