CAS 4091-39-8 appears in our catalog under these names: 3–Chloro–2–butanone, 3-Chloro-2-butanone, 96% , 3-Chloro-2-butanone, >95.0%(GC), 3-CHLORO-2-BUTANONE, 97%, 3-CHLORO-2-BUTANONE, PRODUCED BY WACKER&. Offered by: GLPBio, Thermo Scientific (Alfa Aesar), TCI, Sigma-Aldrich, Chemat. Available pack sizes: 100g, 500g, 25ml, 500ml, 1KG, 25KG, 5g, 25g.