Isopropalin
Weed control herbicide
From Wikipedia, the free encyclopedia
Isopropalin is a herbicide. Introduced in 1969, it is a preëmergent selective dinitroaniline to control annual grasses and broadleaf weeds. Brought by DowElanco in 1972 to the US and Australia, it is now considered obsolete.[1][5][6] In 1974, American farmers used 250,000 pounds (110,000 kg) of isopropalin.[7]
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| Names | |
|---|---|
| Preferred IUPAC name
4-Isopropyl-2,6-dinitro-N,N-dipropylaniline | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.046.977 |
| EC Number |
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| KEGG | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C15H23N3O4 | |
| Molar mass | 309.366 g·mol−1 |
| Appearance | Orange liquid[1] |
| 0.11ppm[2] | |
| Vapor pressure | 30x10−6 mm Hg (30°C)[2] |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Toxic to fish |
| GHS labelling:[3][4] | |
  | |
| Warning | |
| H226, H410 | |
| P210, P233, P240, P241, P242, P243, P273, P280, P303+P361+P353, P370+P378, P391, P403+P235, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Paarlan was a 69% isopropalin emulsifiable concentrate[5] approved for use on tobacco.[3] It required soil incorporation due to low solubility, ultraviolet light degradation and high volatilisation, and it may have been registered for white potatoes and tomatoes.[8] Dow marketed Paarlan to southern culture, with a video advert claiming it "is just as much a part of tobacco country as ham and biscuits are part of breakfast."[9]
Rats fed diets with large amounts of isopropalin had reduced hemoglobin concentrations, lowered hematocrits, and altered organ weights at the higher doses tested.[10]
Isopropalin is the most persistent dinitroaniline herbicide in soil, with a field halflife of nearly 10 months, though only 6 months in the greenhouse test. It is one of the least phytotoxic to sorghum, though in weed-control tests had roughly middle of the pack phytotoxicity to weeds.[11]