1-Ethynylcyclohexanol
1-Ethynylcyclohexanol (ECX) is an alkynyl alcohol derivative which is both a synthetic precursor to, and an active metabolite of the tranquilizer ethinamate, and has similar sedative, anticonvulsant and muscle relaxant effects. It has been sold as a designer drug, first being identified in the UK in March 2012. Preparation. 1-Ethynylcyclohexanol can be prepared from cyclohexanone by the reacting it with sodium acetylide in liquid ammonia, followed by an acidic work-up.