${\displaystyle {\mathsf {{\ce {\underbrace {R3-\!\!{\overset {\displaystyle R1 \atop |}{\underset {| \atop \displaystyle R2}{N}}}\!\!\!\!:} _{tertiary \atop amine}}}+\underbrace {\ce {R4X}} _{{\text{halogeno-}} \atop {\text{alkane}}}{\ce {->\underbrace {\underbrace {R3-{\overset {\displaystyle R1 \atop |}{\underset {| \atop \displaystyle R2}{N+}}}\!\!-R4} _{{quaternay \atop ammonium} \atop cation}+\underbrace {X^{-}} _{halide \atop anion}} _{quaternay\ ammonium\ salt}}}}}}$

Вики-код для замены:

<math chem>\mathsf{\ce{\underbrace{R3-\!\!\overset{\displaystyle R1 \atop | }{\underset{ | \atop \displaystyle R2}{N} }\!\!\!\!:}_{tertiary \atop amine} }

+ \underbrace\ce{R4X}_{\text{halogeno-}\atop\text{alkane} } \ce{-> \underbrace{\underbrace{R3-\overset{\displaystyle R1 \atop | }{\underset{ | \atop \displaystyle R2}{N+} }\!\!-R4}_{ {quaternay \atop ammonium} \atop cation} + \underbrace{X^-}_{halide\atop anion} }_{quaternay\ ammonium\ salt} }}</math>

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