Quaternary carbon
A quaternary carbon is a carbon atom bound to four other carbon atoms. For this reason, quaternary carbon atoms are found only in hydrocarbons having at least five carbon atoms. Quaternary carbon atoms can occur in branched alkanes, but not in linear alkanes.
| primary carbon | secondary carbon | tertiary carbon | quaternary carbon | |
| General structure (R = Organyl group) |
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| Partial Structural formula |
| quaternary carbon |
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| Structural formula of neopentane (quaternary carbon is highlighted red) |
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