Diynes

9,10-Bis(phenylethynyl)anthracene (BPEA) is an aromatic hydrocarbon with the chemical formula is C30H18. It displays strong fluorescence and is used as a chemiluminescent fluorophore with high quantum efficiency.

thumb|right|Histrionicotoxin 283A

1,4-Pentadiyne (penta-1,4-diyne) is a chemical compound belonging to the alkynes. The compound is the structural isomer to 1,3-pentadiyne. == Preparation == Until the late 1960s, no successful synthesis of this seemingly simply preparable molecule was described. Although long-chain and more complex 1,4-diynes had been synthesized successfully before, synthesis approaches starting from sodium acetylide or the acetylene Grignard reagent and propargyl bromide or methylene chloride failed, even with the inclusion of copper(I) chloride. Mostly 1,3-pentadiyne was obtained as rearrangement product.