Draw the products formed when (CH3)2 C=CH2 is treated with each reagent. a. HBr b ·H 2 O, H2 SO4

step 1 Alright, so here we have various reagents that we're going to use to work on this reactant. So f

Draw the products formed when (CH3)2 C=CH2 is treated with...

Draw the products formed when $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CH}_{2}$ is treated with each reagent. a. HBr $\mathrm{b} \cdot \mathrm{H} 2 \mathrm{O}, \mathrm{H}_{2} \mathrm{SO}_{4}$ c. $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{H}_{2} \mathrm{SO}_{4}$ d. $\mathrm{Cl}_{2}$ e. $\mathrm{Br}_{2}, \mathrm{H}_{2} \mathrm{O}$ f. NBS (aqueous DMSO) g.[1] $\mathrm{BH}_{3} ;[2] \mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{HO}^{-}$

Draw the products formed when $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CH}_{2}$ is treated with each reagent.
a. HBr
$\mathrm{b} \cdot \mathrm{H} 2 \mathrm{O}, \mathrm{H}_{2} \mathrm{SO}_{4}$
c. $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{H}_{2} \mathrm{SO}_{4}$
d. $\mathrm{Cl}_{2}$
e. $\mathrm{Br}_{2}, \mathrm{H}_{2} \mathrm{O}$
f. NBS (aqueous DMSO)
g.[1] $\mathrm{BH}_{3} ;[2] \mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{HO}^{-}$

Key Concepts

Electrophilic Addition Reactions

Alkenes react with electrophiles by attacking them with their electron?rich double bonds, forming intermediates (such as carbocations or cyclic halonium ions) that are then attacked by nucleophiles. This mechanism underpins a wide variety of addition reactions that convert alkenes into more saturated compounds.

Markovnikov’s Rule

Markovnikov’s rule explains the regiochemistry observed in many electrophilic addition reactions. It states that when an unsymmetrical alkene reacts with a protic acid, the proton will add to the carbon atom with more hydrogens, resulting in the more stable carbocation intermediate and the electrophile adding to the more substituted carbon.

Nucleophilic Solvent Participation

In many electrophilic addition reactions where a protic solvent such as water or an alcohol is present, the solvent can act as the nucleophile. This leads to the formation of functional groups like alcohols and ethers through the capture of the carbocation intermediate or opening of cyclic intermediates.

Anti Addition and Halogenation Mechanisms

When alkenes react with halogens (or halogens in the presence of water), the addition occurs with anti stereochemistry due to the formation of a cyclic halonium ion intermediate. This cyclic intermediate forces the incoming nucleophilic attack to occur from the opposite side, resulting in products with substituents added on opposite faces of the former double bond.

Allylic Bromination

Allylic bromination involves the selective substitution of a hydrogen atom at the allylic position (the carbon adjacent to a double bond) with a bromine atom, typically using N-bromosuccinimide (NBS). This reaction follows a radical mechanism and yields allylic halide products with high regioselectivity.

Hydroboration-Oxidation

Hydroboration-oxidation is a two-step process used to convert alkenes to alcohols with anti-Markovnikov regioselectivity. In the first step, hydroboration adds boron and hydrogen across the double bond in a concerted, syn fashion, and the subsequent oxidation replaces the boron with a hydroxyl group, yielding a primary alcohol.

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