4-diphenylphosphanylbuta-1,3-diynyl(diphenyl)phosphane

trimethyl(4-trimethylsilylbut-1-en-3-ynyl)silane

trimethyl(8-phenylocta-1,3,5,7-tetraynyl)silane

trimethyl(4-phenylbuta-1,3-diynyl)silane

1,4-diiodobuta-1,3-diyne