Indole-3-Butyric acid CAS 133-32-4

Indole-3-Butyric acid CAS 133-32-4 Information

CAS	133-32-4
Molecular formula	C12H13NO2
Molecular weight	203.24
EIENCS	205-101-5
Form	Liquid
Melting point	124-125.5 °C
boling point	341.55°C
Density	360kg/m3
Solubility	/
PKA	4.83±0.10(Predicted)
Color	Clear colorless to pale yellow
Storage temp	/

What is Indole-3-Butyric acid CAS 133-32-4?

Basic information

Molecular formula: C₁₂H₁₃NO₂, molecular weight 203.24.

Appearance: White to light yellow crystalline solid. The melting point of pure product is 124-125℃, while that of industrial grade is 121-124℃.

Solubility: Insoluble in water (50-250 mg/L at 20℃), readily soluble in organic solvents (such as ethanol, acetone, ether, benzene), slightly soluble in chloroform.

Stability: Stable in neutral or acidic media, but prone to decomposition when exposed to strong oxidants or alkalis. Toxic gases (nitrogen oxides, CO) may be released at high temperatures (>200℃) or under open flames.

Indole-3-Butyric acid CAS 133-32-4 Use

Plant growth regulation

Rooting promotion: Induce the formation of adventitious roots in cuttings of woody/herbaceous plants (such as grapes, roses, kiwifruits), and increase the survival rate of transplanting.

Immersion method: Soak the base at 50-300 mg/L for 6-24 hours (use a lower concentration for easy root growth and planting).

Quick dipping method: Dip at 500-1000 mg/L for 5-10 seconds (for difficult-to-grow seeds such as peaches and pears).

Dipping powder method: Mix potassium indolebutyrate with talcum powder, dip the base of the cutting in powder, and then insert it.

Seed treatment

Woody plants: Soak seeds at 100 mg/L; Herbaceous plants: Soak or mix seeds at a concentration of 10-20 mg/L.

Promote fruit setting

Spray flowers (250 mg/L) on crops such as tomatoes and strawberries to increase the rate of monotypic seed setting.

2. Research and industrial applications

Tissue culture: High concentration promotes the proliferation of tissue culture seedlings.

Synthetic intermediates: Used for the preparation of other plant hormones (such as indole-acetic acid IAA) and raw materials for pharmaceuticals/pesticides.

Indole-3-Butyric acid CAS 133-32-4 safety

Health and environmental risks

Toxicity

Acute oral toxicity (mice) : LD₅₀ = 100 mg/kg; Oral LD₅₀ = 3160 mg/kg in rats.

Irritation and sensitization: Mild irritation to the skin of rabbits and moderate irritation to the eyes. Guinea pig skin has weak sensitization.

Ecological impact

It is highly toxic to aquatic organisms (48h LC₅₀ = 180 mg/L for carp), degrades rapidly in soil, and shows no significant bioaccumulation.

Operation and storage specifications

Protective requirements: Wear chemical protective gloves, goggles and dust masks during operation to avoid inhaling dust or skin contact.

Storage conditions: Keep away from light and sealed. Temperature: 2-8℃. Keep away from strong oxidants, alkalis and heat sources.

Transportation label: UN 2811, packaging category II. "Toxic" label must be affixed. It is strictly prohibited to transport together with food.

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