Kolbe electrolytic decarboxylation (dimerization) (Two carboxylate radicals decarboxylate and couple at anode → R–R (symmetrical alkane))

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Two carboxylate radicals decarboxylate and couple at anode → R–R (symmetrical alkane)

What each symbol means

SymbolWhat it stands for
RAlkyl group (even works for some simple alkyl chains in JEE drills)
RCOO⁻Carboxylate salt (usually Na/K salt)

When to use this

Electrolysis of concentrated sodium carboxylate; anodic oxidation; decarboxylation loses CO₂; radical coupling gives alkane with one more C–C bond symmetry.