A study of the bromination of isoprene under various conditions is reported. Although previous reports stated that bromination of isoprene gave exclusively trans-1, 4-dibromo-2- methyl-2-butene (4), it has been shown that, depending on the conditions, varying amounts of the following dibromides are also formed: cis-l, 4-dibromo-2-methyl-2-butene (3), 3, 4- dibromo-3-methyl-l-butene (21, and 3, 4-dibromo-2-methyl-l-butene~(1). The formation of ...
