Indoleacetic Acid
Title: Indoleacetic Acid
CAS Registry Number: 87-51-4
CAS Name: 1H-Indole-3-acetic acid
Additional Names: heteroauxin; IAA
Molecular Formula: C10H9NO2
Molecular Weight: 175.18
Percent Composition: C 68.56%, H 5.18%, N 8.00%, O 18.27%
Literature References: Plant hormone; recognized as the principal auxin of higher plants. Prepd by the reaction of indole with potassium glycolate at 250°: Johnson, Crosby, J. Org. Chem. 28, 1246 (1963). From indole and chloroacetic acid: Shagalov et al., US 3320281 (1967). Reviews: Leopold in The Hormones vol. IV, G. Pincus et al., Eds. (Academic Press, New York, 1964) pp 1-66; Thimann in The Physiology of Plant Growth and Development, M. B. Wilkins, Ed. (McGraw-Hill, New York, 1969) pp 1-45.
Properties: Leaflets or cryst powder from water, mp 168-170°. pK 4.75. Sparingly sol in water or chloroform; freely sol in alc; sol in acetone, ether.
Melting point: mp 168-170°
pKa: pK 4.75
Use: Plant growth regulator.

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