Fenoprop

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title: "Fenoprop" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["auxinic-herbicides", "carboxylic-acids", "chlorobenzene-derivatives", "phenol-ethers", "group-4-herbicides"] topic_path: "general/auxinic-herbicides" source: "https://en.wikipedia.org/wiki/Fenoprop" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

| ImageFile = fenoprop.png | ImageSize = | PIN = rac-(2R)-2-(2,4,5-trichlorophenoxy)propanoic acid | OtherNames = 2-(2,4,5-Trichlorophenoxy)propionic acid Silvex |Section1={{Chembox Identifiers | Abbreviations = 2,4,5-TP | ChemSpiderID_Ref = | ChemSpiderID = 6891 | KEGG_Ref = | KEGG = C14532 | InChI = 1/C9H7Cl3O3/c1-4(9(13)14)15-8-3-6(11)5(10)2-7(8)12/h2-4H,1H3,(H,13,14) | InChIKey = ZLSWBLPERHFHIS-UHFFFAOYAC | ChEMBL_Ref = | ChEMBL = 460296 | ChEBI = 34758 | UNII = D2HZL58IS3 | StdInChI_Ref = | StdInChI = 1S/C9H7Cl3O3/c1-4(9(13)14)15-8-3-6(11)5(10)2-7(8)12/h2-4H,1H3,(H,13,14) | StdInChIKey_Ref = | StdInChIKey = ZLSWBLPERHFHIS-UHFFFAOYSA-N | CASNo = 93-72-1 | CASNo_Ref = | PubChem = 7158 | SMILES = Clc1cc(OC(C(=O)O)C)c(Cl)cc1Cl |Section2={{Chembox Properties | Properties_ref = | Formula = C9H7Cl3O3 | MolarMass = 269.51 | Appearance = White powder | Density = 1.21 g/cm3 at 20 °C | MeltingPtC = 180 | BoilingPt = | Solubility = | LogP = 3.8 (20 °C) | pKa = 2.84 |Section3={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt =

Fenoprop, also called 2,4,5-TP, is the organic compound 2-(2,4,5-trichlorophenoxy)propionic acid. It is a phenoxy herbicide and a plant growth regulator, an analog of 2,4,5-T in which the latter's acetic acid sidechain is replaced with a propionate group (with an extra CH3). The addition of this extra methyl group creates a chiral centre in the molecule and useful biological activity is found only in the (2R)-isomer. The compound's mechanism of action is to mimic the auxin growth hormone indoleacetic acid (IAA). When sprayed on plants it induces rapid, uncontrolled growth. As with 2,4,5-T, fenoprop is toxic to shrubs and trees.

The name Silvex was used in the USA but it has been banned from use there since 1985. According to the Environmental Protection Agency its greatest use was as a postemergence herbicide for control of woody plants, and broadleaf herbaceous weeds in rice and bluegrass turf, in sugarcane, in rangeland improvement programs and on lawns. Fenoprop and some of its esters were in use from 1945 but are now obsolete.

References

Pesticide Properties Database. "Fenoprop". University of Hertfordshire.
"Compendium of Pesticide Common Names".
(31 December 2012). "Comprehensive Chirality".
Grossmann, K.. (2010). "Auxin herbicides: current status of mechanism and mode of action.". Pest Management Science.
US Environmental Protection Agency. "Consumer Factsheet on: 2,4,5-TP (SILVEX)".

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