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In addition to the natural auxins, a whole range of synthetic auxins are known. The most widely used are -naphthaleneacetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). Used in high doses, auxin stimulates the production of ethylene. Excess ethylene can inhibit elongation growth, cause leaf abscission, and even kill the plant. 2,4-D and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) have been used as herbicides. Dicots are much more susceptible to auxins than monocots like grass and cereal crops.

SYNTHETIC AUXINS

PICLORAM [4-amino-3,5,6-trichloropicolinic acid]

MW 241.46; crystalline; purity > 98% (HPLC)
CAS: 1918-02-1; C₆H₃Cl₃N₂O₂

	016 2901	1	g
	016 2902	5	g
	016 2903	25	g

α-NAPHTALENEACETIC ACID (NAA)

MW 186.21; crystalline; purity > 98% (HPLC)
CAS: 86-87-3; C₁₂H₁₀O₂

	016 2911	5	g
	016 2912	25	g
	016 2913	100	g

α-NAPHTALENEACETIC ACID POTASSIUM SALT (NAA-K)

MW 224.31; crystalline; purity > 90% (HPLC)
CAS: 15165-79-4; C₁₂H₉KO₂

	016 6291	5	g
	016 6292	25	g
	016 6293	100	g

β-NAPHTHOXYACETIC ACID (BNOA)

MW 202.21; crystalline; purity > 98% (HPLC)
CAS: 120-23-0; C₁₂H₁₀O₃

	016 2921	1	g
	016 2922	5	g
	016 2923	25	g
	016 2924	100	g

2,4-DICHLOROPHENOXYACETIC ACID (2,4-D)

MW 221.04; crystalline; purity > 97% (HPLC)
CAS: 94-75-7; C₈H₆Cl₂O₃

	016 2931	10	g
	016 2932	25	g
	016 2933	50	g

DICAMBA [2-methoxy-3,6-dichlorobenzoic acid]

MW 221.04; crystalline; purity > 97% (HPLC)
CAS: 1918-00-9; C₈H₆Cl₂O₃

	016 2951	50	mg
	016 2952	250	mg
	016 2953	1	g

4-CHLOROPHENOXYACETIC ACID (4-CPA, CPA)

MW 186.60; crystalline; purity > 97% (HPLC)
CAS: 122-88-3; C₈H₇ClO₃

	016 2961	10	g
	016 2962	25	g
	016 2963	100	g