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| |style="background: #F8EABA; text-align: center;"
colspan="2"||Piperazine| |Molar mass||86.14 g mol-1|
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Except where noted otherwise, data are given for| materials in
their standard state (at 25 °C, 100 kPa) Infobox disclaimer and
references The piperazines are a broad class of chemical
compounds, many with important pharmacological properties, which
contain a core piperazine functional group. Origin and
namingEdit Piperazines were originally named because of their
chemical similarity with piperidine, a constituent of piperine
in the black pepper plant (Piper nigrum). Piperidine itself is
found in fireant venom and is the cause of the burning
sensations from the bites of these insects. Piperazine is freely
soluble in water and ethylene glycol, but insoluble in diethyl
ether. It is a weak base with a pKb of 4.19; the pH of a