DNBE decomposition produces also 1-butanol.
1-butene isomerizes to cis-2-butene [R4] and trans-2-butene [R5].
Furthermore, cis-2-butene can isomerize to trans-2-butene [R6] and vice versa.
The olefins can react with water to produce 2-butanol [R7–R9] or with 1-butanol to produce 1-(1-methylpropoxy) butane [R10–R12].
More details about byproducts formation can be found else- where (Pérez et al., 2014).