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(organic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



piperonal, a compound with the odor of heliotrope flowers. Heliotropin forms colorless crystals. Its melting point is 36.5°-37° C, and its boiling point is 263° C. It is poorly soluble in water and more soluble in organic solvents; it is easily distilled with water vapor. Heliotropin is contained in heliotrope flowers, in vanilla pods, and in some essential oils. Industrially, heliotropin is obtained from safrole. Heliotropin is used in the perfume industry and cosmetics and in the production of toilet soaps.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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(23.) Heliotropin. Polarized light microscopy digital image gallery http://micro.magnet.fsu.edu/primer/techniques/polarized/gallery/pages/heliotropmnsmall.html.
They include organic acids (acetic, benzoic, cinnamic and phenylacetic); alcohols (benzyl alcohol, borneol, cinnamyl alcohol, citronellol, geraniol, linalool, menthol, phenylethyl alcohol and terpineol); aldehydes (anisic aldehyde, cinnamic aldehyde, benzaldehyde, citral, piperonal or heliotropin, salicylic aldehyde and vanillin); ketones (carvones, camphor, thujone, pulegone, etc; esters such as bornyl acetate, methyl salicylate, benzyl benzoate, geranyl acetate and linalyl acetate); phenols (thymol, carvacrol and chavicol); phenol ethers (anethol, eugenol and safrol) and many other more complex compounds such as coumarin and indol.
At New York's Sloan-Kettering Cancer Center, a study found that those exposed to heliotropin - a sweet, vanilla-like scent - experienced approximately 63% less over-all anxiety while undergoing magnetic-resonance imaging.