B 2400 (OTTO) Butyl chloride, for HPLC, 99%+ Cas 109-69-3 - used as intermediates and solvents. It is used for HPLC, spectrophotometry and environmental testing. B 2400 (OTTO) Butyl chloride, for HPLC, 99%+ Cas 109-69-3 - used as alkylating reagent in organic and organometallic compound synthesis. It is also employed as an antihelmintic in veterinary medicine.