CAS 4784-77-4 appears in our catalog under these names: Crotyl Bromide, >83.0%(GC), Crotyl Bromide, 83%, 83%, trans-1-Bromo-2-butene, 85% (remainder 3-Bromo-1-butene), 85%(GC),(mixture of cis & trans),RG. Offered by: TCI, Chemat, Fluorochem. Available pack sizes: 25ml, 1g, 5g, 25g.