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Bimolecular
Involving two molecules. In this SparkNote, the term bimolecular is used to refer to SN2 and E2 reactions. The rate-limiting transition states of both reactions involve two molecules.
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Carbocation
A carbon that carries a positive charge. Carbocations are highly unstable and are prone to rearrangement. SN1 and E1 reactions proceed through a common carbocation intermediate.
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E1
A reaction where a β-hydrogen is Eliminated to form a double bond. E1 reactions go through a carbocation intermediate. Somewhat similar to the E2 reaction.
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SN1
A reaction in which a Nucleophile Substitutes for a leaving group. SN1. It goes through a carbocation intermediate.
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Secondary
A secondary carbon has bonds to two other carbons.
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Tertiary
A tertiary carbon has bonds to three other carbons.
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Unimolecular
Involving one molecule. This term is used synonymously with the E1 and SN1 reactions in this SparkNote. The rate-limiting transition states of both mechanisms involve one molecule.
