An unsaturated heterocyclic compound having two nitrogen atoms in a five-membered ring, C3H4N2; m.p. 66–70°C; b.p. 168–188°C. Pyrazine is a symmetric diazine.
Pyrazole
- Klaproth, Martin Heinrich
- Klatt synthesizer
- Klazminskian
- Kleene closure
- Kleene-plus
- Kleene star
- Kleene’s theorem
- Kleiber’s law
- Klein bottle
- Klein, (Christian) Felix
- Klein, (Christian) Felix (1849–1925)
- Klein four‐group
- Kleinmann–Low Nebula
- Klein–Gordon equation
- kleptocracy
- kleptoparasitism
- K line
- Klinefelter’s syndrome
- Kline, Morris (1908–92)
- klinostat
- klippe
- Klitzing, Klaus von
- k lookahead
- Klotz test
- kludge