See also:

• PIPERONAL (heliotropine, protocatechuic aldehyde methylene ether), C8H6O3

PIPERONAL (heliotropine, protocatechuic aldehyde methylene See also:

• ETHER, (C2H5)2O

ether), C8H6O3  , an aromatic aldehyde . It is prepared by oxidizing piperic See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid with See also:

• POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium permanganate (R . See also:

• FITTIG, RUDOLF (1835– )

Fittig, See also:

• ANN

Ann., 1869, 152, p . 35); by condensing methylene iodide with protocatechuic aldehyde (R . See also:

• WEGSCHEIDER, JULIUS AUGUST LUDWIG (1771-1849)

Wegscheider, Monats., 1893, 14, p . 388) ; or by oxidizing isosafrol with chromic acid . It forms See also:

• LONG, GEORGE (1800-1879)
• LONG, JOHN DAVIS (1838– )

long colourless crystals which melt at 370 C. and See also:

• BOIL

boil at 263° C . It has an agreeable See also:

• SMELL (connected etymologically with " smoulder " and " smoke ")

smell, resembling that of See also:

• HELIOTROPE
• HELIOTROPE, or TURNSOLE

heliotrope, and is much used in See also:

• PERFUMERY (Lat. per, through, and fumare, to smoke)

perfumery . It is only slightly soluble in See also:

• COLD (in O. Eng. cald and ceald, a word coming ultimately from a root cognate with the Lat. gelu, gelidus, and common in the Teutonic languages, which usually have two distinct forms for the substantive and the adjective, cf. Ger. Kolte, kalt, Dutch koude

cold See also:

• WATER

water, but is readily soluble in See also:

• ALCOHOL

alcohol and in See also:

• ETHER, (C2H5)2O

ether . When heated with dilute hydrochloric acid to Zoo° C. it yields protocatechuic aldehyde, C7H6O3, and See also:

• CARBON (symbol C, atomic weight 12)

carbon . It readily combines with See also:

• SODIUM [symbol Na, from Lat. natrium; atomic weight 23.00 (0=16)]

sodium bisulphite and with various bases (See also:

• AMMONIA (NH3)

ammonia, See also:

• ANILINE, PHENYLADIINE, or AMINOBENZENE, (C6H5NH2)

aniline, methylamine, &c.) .