Piperazine

Piperazine () is an organic compound with the formula (CH2CH2NH)2. In terms of its structure, it can be described as cyclohexane with the 1- and 4-CH2 groups replaced by NH. Piperazine exists as a deliquescent solid with a saline taste. Piperazine is freely soluble in water and ethylene glycol, but poorly soluble in diethyl ether. Piperazine is commonly available industrially as the hexahydrate, (CH2CH2NH)2·6H2O, which melts at 44 °C and boils at 125–130 °C. Substituted derivatives of piperazine are a broad class of chemical compounds. Many piperazines have useful pharmacological properties, with prominent examples including sildenafil, ciprofloxacin, and ziprasidone.