Pyrazoline

Part of speech: noun

Definitions

1. A class of organic molecules featuring a five-membered ring that incorporates two nitrogen atoms and finds applications in chemical syntheses
2. This organic compound is known for its five-membered cyclic structure with two nitrogen atoms and is utilized in synthetic chemistry for various purposes
3. A type of chemical compound characterized by a five-membered ring structure containing two nitrogen atoms, widely used in organic synthesis and research applications

Etymology: Pyrrole, a compound that turns pine splinters red when soaked in acid, takes its name from the Greek "pyrrhos", meaning fiery or reddish, which in turn comes from "pyr", fire. Chemists later joined this stem to "azole", the family name for five-membered rings containing nitrogen, to form "pyrazole". "Azole" itself derives from "azote", the name Lavoisier gave nitrogen, meaning "lifeless", because the gas does not support life or combustion. The "-ine" ending marks a partly reduced ring, one with extra hydrogen atoms added. Pyrazoline is therefore the saturated relative of pyrazole, and the same pattern appears in "pyrroline", derived from pyrrole.