Butynediol intermediate
Butynediol intermediate is commercially available as a solid or in a 50-percent aqueous solution. The triple bond in butynediol intermediate has a high electron density and an affinity for metals similar to propargyl alcohol intermediate.
The two hydroxyl groups undergo typical reactions such as ethoxylation to produce butoxyne/butyne 497, a 100-percent active liquid with a melting point of approximately -15 °C.