noun
reaction intermediate
Technical term in chemistry for a transient species formed during a chemical reaction.
この反応では、カルボカチオンが反応中間体として生成する。
In this reaction, a carbocation is generated as a reaction intermediate.
A broader term for any intermediate, not necessarily in a chemical reaction. 反応中間体 specifically refers to a reaction intermediate in chemistry.
Compound of 反応 (reaction) + 中間体 (intermediate). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.