5-bromo-3-sec-butyl-6-methyluracil; 5-Bromo-6-Methyl-3-(1-Methylpropyl)-2,4(1h,3h)-Pyrimidinedione; Du Pont Herbicide 976; 5-bromo-3-(butan-2-yl)-6-methylpyrimidine-2,4(1H,3H)-dione

5-bromo-3-sec-butyl-6-methyluracil

C₉H₁₃BrN₂O₂

Form Colourless crystals.

Melting point 157.5-160℃.

Density 1.59 (23℃).

Solubility In water 807 (pH 5), 700 (pH 7), 1287 (pH 9) (all in mg/l, 25℃). In ethanol 134, acetone 167, acetonitrile 71, xylene 32, 3% aqueous sodium hydroxide 88 (all in g/l, 25℃).

Oral Acute oral LD50 for male rats 2000, female rats 1300 mg/kg (for 80% formulation).

Skin and eye Acute percutaneous LD50 for rabbits >5000 mg/kg.

Mild eye and moderate skin irritant. Non-sensitising to skin.

For selective control of annual and perennial weeds and grasses in citrus and pineapple plantations.