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PIPERONAL (heliotropine, protocatechu...

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Originally appearing in Volume V21, Page 635 of the 1911 Encyclopedia Britannica.
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PIPERONAL (heliotropine, protocatechuic aldehyde methylene See also:ether), C8H6O3  , an aromatic aldehyde . It is prepared by oxidizing piperic See also:acid with See also:potassium permanganate (R . See also:Fittig, See also:Ann., 1869, 152, p . 35); by condensing methylene iodide with protocatechuic aldehyde (R . See also:Wegscheider, Monats., 1893, 14, p . 388) ; or by oxidizing isosafrol with chromic acid . It forms See also:long colourless crystals which melt at 370 C. and See also:boil at 263° C . It has an agreeable See also:smell, resembling that of See also:heliotrope, and is much used in See also:perfumery . It is only slightly soluble in See also:cold See also:water, but is readily soluble in See also:alcohol and in See also:ether . When heated with dilute hydrochloric acid to Zoo° C. it yields protocatechuic aldehyde, C7H6O3, and See also:carbon . It readily combines with See also:sodium bisulphite and with various bases (See also:ammonia, See also:aniline, methylamine, &c.) .

End of Article: PIPERONAL (heliotropine, protocatechuic aldehyde methylene ether), C8H6O3
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PIPIT (cognate with the Lat. Pipio; see PIGEON)

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