Naphthaleneacetic acid (NAA)

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Plant growth regulator

1-Naphthaleneacetic acid (NAA) is an organic compound with the formula C10H7CH2CO2H. This colorless solid is soluble in organic solvents. It features a carboxylmethyl group (CH2CO2H) linked to the "1-position" of naphthalene.




NAA is a synthetic plant hormone in the auxin family and is an ingredient in many commercial plant rooting horticultural products; it is a rooting agent and used for the vegetative propagation of plants from stem and leaf cutting. It is also used for plant tissue culture.

NAA is widely used in agriculture for various purposes. It is considered to be only slightly toxic but when at higher concentrations it can be toxic to animals. This was shown when tested on rats via oral ingestion at 1000–5900 mg/kg. NAA has been shown to greatly increase cellulose fiber formation in plants when paired with another phytohormone called gibberellic acid. Because it is in the auxin family it has also been understood to prevent premature dropping and thinning of fruits from stems. It is applied after blossom fertilization. Increased amounts of it can actually have negative effects however, and cause growth inhibition to the development of plant crops. It has been used on many different crops including apples, olives, oranges, potatoes, and various other hanging fruits. In order for it to obtain its desired effects it must be applied in concentrations ranging from 20–100 µg/mL.


Physical and Chemical Properties:

Appearance: White-like crystal

Empirical Formula: C12H10O2

Molecular Weight: 186.21 g·mol−1

Solubility: Soluble in acetone, ethyl ether, chloroform, methylene chloride and hot benzene



Technical: 98% TC

Naphthaleneacetic acid Naphthaleneacetic acid



CAS Number: 86-87-3




More information:

  • CAS Number: 86-87-3

  • Formula: C12H10O2