Topic a1 - Carbocations

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8 Terms

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What is Hammond Postulate

The Hammond Postulate states that the transition state of a reaction resembles either the reactants or products, depending on whether the reaction is exothermic or endothermic, helping to predict the structure and stability of carbocations.

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In an exothermic reaction TS resembles LHS or RHS

RHS

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In an endothermic reaction TS resembles LHS or RHS

LHS

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+I inductive effects _____ carbocations

stabilise

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-I inductive effects _____ carbocations

destabilise

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vinyl carbocation has ________ because +ve charge is perpendicular to the sp2 orbitals

no resonance

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3 ways form carbocation

Lewis acid, Acid activation of OHs, Addition to pi system (H+)

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Carbocation reactions

Addition of Nucleophile, Elimination and Migration(rearrangement)