diethyl [(E)-4-bromobut-2-en-1-yl]phosphonate

Tetraethyl 2-butene-1,4-diphosphonate

3,4-二溴丁-1-烯

N,N,N',N'-四甲基-2-丁烯-1,4-二胺

1,2,4-三溴丁烷