Pyraquinate

Pyraquinate is a chemical herbicide. It is a benzoylpyrazole, having a central functional group that includes a benzoyl group combined with pyrazole,^[1] and is in the class of 4-hydroxyphenylpyruvate dioxygenase inhibiting herbicides.^[2] Its formula is C₂₇H₂₈ClN₅O₅.^[3]

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Pyraquinate

Names
Preferred IUPAC name [4-[3-(3-chlorophenyl)-1,5-dimethyl-2,4-dioxoquinazoline-6-carbonyl]-2,5-dimethylpyrazol-3-yl] N,N-diethylcarbamate
Identifiers
CAS Number	2378093-62-8
3D model (JSmol)	Interactive image
ChEBI	CHEBI:229757
ChemSpider	115266409
PubChem CID	146187940
InChI InChI=1S/C27H28ClN5O5/c1-7-32(8-2)27(37)38-25-22(16(4)29-31(25)6)23(34)19-12-13-20-21(15(19)3)24(35)33(26(36)30(20)5)18-11-9-10-17(28)14-18/h9-14H,7-8H2,1-6H3 Key: QCETYWAAOPFNSO-UHFFFAOYSA-N
SMILES CCN(CC)C(=O)OC1=C(C(=NN1C)C)C(=O)C2=C(C3=C(C=C2)N(C(=O)N(C3=O)C4=CC(=CC=C4)Cl)C)C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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The herbicide was patented in 2022, but only released to market in 2025.^[4] It is not approved for use in any European Union countries. Under HRAC classification, it is placed in class F2.^[5]

Several crystalline forms of pyraquinate are known. The commercially available form, as well as several of its polymorphs, has a triclinic crystal system.^[6]