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4-Chloroindole-3-acetic acid
Names
	Preferred IUPAC name (4-Chloro-1H-indol-3-yl)acetic acid
	Other names 2-(4-Chloro-1H-indol-3-yl)acetic acid
Identifiers
CAS Number	2519-61-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:20339 ;
ChEMBL	ChEMBL309993 ;
ChemSpider	90727 ;
ECHA InfoCard	100.255.860
PubChem CID	100413;
UNII	RF78HU5XXV ;
CompTox Dashboard (EPA)	DTXSID10179857 ;
	InChI InChI=1S/C10H8ClNO2/c11-7-2-1-3-8-10(7)6(5-12-8)4-9(13)14/h1-3,5,12H,4H2,(H,13,14) Key: WNCFBCKZRJDRKZ-UHFFFAOYSA-N ; InChI=1/C10H8ClNO2/c11-7-2-1-3-8-10(7)6(5-12-8)4-9(13)14/h1-3,5,12H,4H2,(H,13,14) Key: WNCFBCKZRJDRKZ-UHFFFAOYAY;
	SMILES Clc1cccc2c1c(c[nH]2)CC(=O)O;
Properties
Chemical formula	C10H8ClNO2
Molar mass	209.63 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

4-Chloroindole-3-acetic acid (4-Cl-IAA) is an organic compound that functions as a plant hormone.^[1]

Synopsis

It is a member of the class of compounds known as auxins and a chlorinated analogue of the more common indole-3-acetic acid (IAA) auxin. 4-Cl-IAA is found in the seeds of a variety of plants, particularly legumes such as peas and broad beans.^[2]^[3]^[4]^[5] In one study it is written that the substance is "mainly found in reproductive structures" and "is thought to be restricted to members of the leguminous tribe Fabeae, specifically "the genera Vicia, Pisum, Lathyrus, Lens, and Vavilovia".^[6] In Pisum sativum, 4-Cl-IAA biosynthesis diverges from IAA biosynthesis when the amino acid tryptophan is chlorinated to form 4-chlorotryptophan (4-Cl-Trp); the biosynthesis of 4-Cl-IAA then precedes parallel to that of IAA.^[7]

Engvild hypothesized in 1996 that 4-Cl-IAA may be a "death hormone" that maturing seeds use to trigger death of the parent plant by mobilizing nutrients to be stored in the seed.^[8]

Lam et al found the substance in the seeds of Medicago truncatula, Melilotus indicus, and three species of Trifolium.^[6]

References

^ Reinecke, Dennis M. (1999). "4-Chloroindole-3-acetic acid and plant growth". Plant Growth Regulation. 27 (1): 3–13. doi:10.1023/A:1006191917753. ISSN 0167-6903. S2CID 23683065.
^ Pless, Tanja; Boettger, Michael; Hedden, Peter; Graebe, Jan (1984). "Occurrence of 4-Cl-indoleacetic acid in broad beans and correlation of its levels with seed development". Plant Physiology. 74 (2): 320–3. doi:10.1104/pp.74.2.320. PMC 1066676. PMID 16663416.
^ Ernstsen, Arild; Sandberg, Goeran (1986). "Identification of 4-chloroindole-3-acetic acid and indole-3-aldehyde in seeds of Pinus sylvestris". Physiologia Plantarum. 68 (3): 511–18. doi:10.1111/j.1399-3054.1986.tb03390.x.
^ Katayama, Masato; Thiruvikraman, Singanallore V.; Marumo, Shingo (1987). "Identification of 4-chloroindole-3-acetic acid and its methyl ester in immature seeds of Vicia amurensis (the tribe Vicieae), and their absence from three species of Phaseoleae". Plant and Cell Physiology. 28 (2): 383–386. ISSN 0032-0781. Archived from the original on 16 October 2013. Retrieved 16 October 2013.
^ Magnus, Volker; Ozga, Jocelyn A.; Reinecke, Dennis M.; Pierson, Gerald L.; Larue, Thomas A.; Cohen, Jerry D.; Brenner, Mark L (1997). "4-chloroindole-3-acetic and indole-3-acetic acids in Pisum sativum". Phytochemistry. 46 (4): 675–681. doi:10.1016/S0031-9422(97)00229-X.
^ ^a ^b Lam, H. K.; McAdam, S. A.; McAdam, E. L.; Ross, J. J. (2015). "Evidence That Chlorinated Auxin is Restricted to the Fabaceae but Not to the Fabeae". Plant Physiology. 168 (3): 798–803. doi:10.1104/pp.15.00410. PMC 4741347. PMID 25971549.
^ Tivendale, N.D.; Davidson, S. E.; Davies, N. W.; Smith, J. A.; Dalmais, M.; Bendahmane, A. I.; Quittenden, L. J.; Sutton, L.; Bala, R. K.; Signor, C. Le; Thompson, R.; Horne, J.; Reid, J. B.; Ross, J. J. (2012). "Biosynthesis of the Halogenated Auxin, 4-Chloroindole-3-Acetic Acid". Plant Physiology. 159 (3): 1055–1063. doi:10.1104/pp.112.198457. PMC 3387693. PMID 22573801.
^ Engvild, Kjeld C. (1996). "Herbicidal activity of 4-chloroindoleacetic acid and other auxins on pea, barley and mustard". Physiologia Plantarum. 96 (2): 333–337. doi:10.1111/j.1399-3054.1996.tb00222.x.