Dithiopyr

Dithiopyr is a preemergent herbicide for crabgrass control in turf and ornamental grasses. It is effective on 45 grassy and broadleaf weeds.^[1] Dithiopyr inhibits root growth of susceptible weeds as well as turf grass and thus should be used only on established turf with a well-developed root system. Its duration of efficacy is approximately 4 months, so lawns should not be reseeded during this time frame following application of the chemical. Dithiopyr acts primarily as a preemergent herbicide but can also be used in early postemergent control of crabgrass.

Dithiopyr

Names
IUPAC name Dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)pyridine-3,5-dicarbothioate
Identifiers
CAS Number	97886-45-8 Y
3D model (JSmol)	Interactive image
ChemSpider	82855 Y
ECHA InfoCard	100.131.988
KEGG	C18826 Y
PubChem CID	91757
UNII	2TXF17HAV1 Y
CompTox Dashboard (EPA)	DTXSID9032379
InChI InChI=1S/C15H16F5NO2S2/c1-6(2)5-7-8(13(22)24-3)10(12(16)17)21-11(15(18,19)20)9(7)14(23)25-4/h6,12H,5H2,1-4H3 Y Key: YUBJPYNSGLJZPQ-UHFFFAOYSA-N Y InChI=1/C15H16F5NO2S2/c1-6(2)5-7-8(13(22)24-3)10(12(16)17)21-11(15(18,19)20)9(7)14(23)25-4/h6,12H,5H2,1-4H3 Key: YUBJPYNSGLJZPQ-UHFFFAOYAT
SMILES FC(F)(F)c1nc(c(c(c1C(=O)SC)CC(C)C)C(=O)SC)C(F)F
Properties
Chemical formula	C15H16F5NO2S2
Molar mass	401.42 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

It is an ingredient in many products including Dimension from Dow AgroSciences.^[2]

Mode of action

Dithiopyr acts as a root growth inhibitor, causing cessation of root elongation and inhibition of mitotic cell division. It inhibits formation of microtubules and spindle organizing centers. Dithiopyr may alter microtubule polymerization and stability by "interacting with microtubule associated proteins or microtubule organizing centers rather than interaction directly with tubulin."^[3] Mitotic cells are arrested in late prometaphase. Cell entry into mitosis is unaffected.

Synthesis

Dithiopyr can be obtained through a multi-step process starting from ethyl trifluoroacetoacetate and isovaleraldehyde.^[4]