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Indole-3-butyric acid

Indole-3-butyric acid
IUPAC name 1H-Indole-3-butanoic acid
Other names indole-3-butyric acid

3-indolebutyric acid
indolebutyric acid

CAS number 133-32-4
RTECS number NL5250000
Molecular formula C12H13NO2
Molar mass 203.24 g/mol
Appearance white to light yellow crystals
Melting point

125 °C

Boiling point


Crystal structure cubic
R-phrases R25 R36/37/38
S-phrases S26 S28 S36/37/39 S38 S45
Related Compounds
Related auxin
indole-3-acetic acid
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Indole-3-butyric acid (1H-Indole-3-butanoic acid, IBA) is a white to light-yellow crystalline solid, with the molecular formula C12H13NO2. It melts at 125 °C in atmospheric pressure and decomposes before boiling.

As a Plant Hormone

IBA is a plant hormone in the auxin family and is an ingredient in many commercial plant rooting horticultural products.

For use as such, it should be dissolved in about 75% (or purer) alcohol (as IBA does not dissolve in water), until a concentration from between 10,000 ppm to 50,000 ppm is achieved - this solution should then be diluted to the required concentration using distilled water. The solution should be kept in a cool, dark place for best results.

This compound had been thought to be strictly synthetic; however, it was reported that the compounds was isolated from leaves and seeds of maize and other species.[1]


  1. ^ William. G.Hopkins(1999). Introduction to Plant Physiology. John Wiley and Sons. ISBN 0-471-19281-3
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Indole-3-butyric_acid". A list of authors is available in Wikipedia.
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