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Encyclopedia Britannica



PIPERONAL (heliotropine, protocatechuic aldehyde methylene ether), C8H6O3

This article appears in Volume V21, Page 635 of the Encyclopedia Britannica.

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


End of Article: PIPERONAL (heliotropine, protocatechuic aldehyde methylene ether), C8H6O3


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