Isopropyl alcohol is produced commercially by the hydration...

Name: Problem 39, Chapter 4: Organic Chemistry
Uploaded: 2021-03-08T20:47:34-08:00
Duration: 3 min 16 s
Channel: Nicholas Sacco
Description: Isopropyl alcohol is produced commercially by the hydration of propene. Show the mechanistic steps of this process. If you do not know the structure of isopropyl alcohol, try to deduce it by analogy from the structure of propene and the mechanism of alkene hydration.

Isopropyl alcohol is produced commercially by the hydration of propene. Show the mechanistic steps of this process. If you do not know the structure of isopropyl alcohol, try to deduce it by analogy from the structure of propene and the mechanism of alkene hydration.

Key Concepts

Electrophilic Addition

Electrophilic addition is a reaction mechanism in which an electrophile, such as a proton, first adds to an electron-rich multiple bond (typically a carbon–carbon double bond), resulting in the formation of a positively charged intermediate. This intermediate is then attacked by a nucleophile, leading to the overall addition of two groups across the double bond.

Markovnikov's Rule

Markovnikov's rule is a guiding principle for the regioselectivity of electrophilic additions to unsymmetrical alkenes. It states that when adding a protic acid (HX) to an alkene, the hydrogen atom will attach to the carbon with more hydrogen atoms already present, forming the more stable carbocation intermediate, and the halide or other nucleophile will attach to the more substituted carbon.

Carbocation Intermediate

A carbocation intermediate is a transient species featuring a positively charged carbon atom formed during the initial step of electrophilic addition reactions. Its stability is critical to the reaction pathway; tertiary and secondary carbocations are generally favored over primary due to greater stabilization through hyperconjugation and inductive effects.

Nucleophilic Attack and Deprotonation

Following the formation of the carbocation, a nucleophile, such as water in hydration reactions, attacks the positively charged carbon. This nucleophilic attack forms a protonated alcohol, which then undergoes deprotonation (loss of a proton) to yield the final neutral alcohol product.

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