Organic chem problem?
Compare the bromine/water addition to a symmetric alkene and an unsymmetric alkene.
please help, explain, thanks
Answer:
symmetric alkene only have single bond. with the present of UV light (which provide enough energy to haloge), the halogen will replace hidrogen atom in the molecul. this process is called subtitution.
unsymmetric alkene means there is a double bond or triple bond in the molecule. the bromine can break the bond and fillup the molecule with halogen. this process calles addition
The previous answer is completely wrong.
If you have something like 2-butene, then addition of bromine-water will give only one product, 3-bromo-2-butanol (note there is some stereochemistry depending on whether you start with cis or trans 2-butene).
If you have something like propene, then you could get either 2-bromo-1-propanol or 1-bromo-2-propanol. As I recall, the bromonium ion intermediate is unsymmetrical such that more positive charge gets left on the substituted carbon, so that is where the water goes. In other words, you get mostly 2-bromo-1-propanol.
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please help, explain, thanks
Answer:
symmetric alkene only have single bond. with the present of UV light (which provide enough energy to haloge), the halogen will replace hidrogen atom in the molecul. this process is called subtitution.
unsymmetric alkene means there is a double bond or triple bond in the molecule. the bromine can break the bond and fillup the molecule with halogen. this process calles addition
The previous answer is completely wrong.
If you have something like 2-butene, then addition of bromine-water will give only one product, 3-bromo-2-butanol (note there is some stereochemistry depending on whether you start with cis or trans 2-butene).
If you have something like propene, then you could get either 2-bromo-1-propanol or 1-bromo-2-propanol. As I recall, the bromonium ion intermediate is unsymmetrical such that more positive charge gets left on the substituted carbon, so that is where the water goes. In other words, you get mostly 2-bromo-1-propanol.
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