Quaternary compound

In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements.

In another use of the term in

The best-known quaternary compounds are quaternary ammonium salts, having a nitrogen atom at the centre.^[2] For example, in the following reaction, the nitrogen atom is said to be quaternized as it has gone from 3 to 4 substituents:

${\displaystyle {\ce {R3N + RCl -> R4N+Cl-}}}$

Other examples include substituted

• Binary compound
• Ternary compound
• Onium ion
• Quaternary phase

References