Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Addition of (psesudo) halogens across the triple bond of 1,4-dichlorobut-2-yne, followed by a 1,4-elimination, provides a very simple preparation of ten novel butadienes. ... PhsBr; Thiophenol and N-bromosuccinimide in CH 2 C 12 . PhSeBr; Diphenyldiselenide and molecular ...