Propose detailed mechanisms for the following reactions. ***These mechanisms cam
ID: 859730 • Letter: P
Question
Propose detailed mechanisms for the following reactions.
***These mechanisms came from a practice exam in which our Teaching Assistant went over the problems. However, when she did she went really fast and I am not sure if I wrote the notes down correct, which is why I am asking if someone could please rewrite and possibly explain these mechanisms.
The following are the notes I took at lecture:
Propose detailed mechanisms for the following reactions. Propose detailed mecahnism for the following reactions. ***These mechanisms came from a practice exam in which our Teaching Assistant went over the problems. However, when she did she went really fast and I am not sure if I wrote the notes down correct, which is why I am asking if someone could please rewrite and possibly explain these mechanisms. The following are the notes I took at lecture: 5. Propose detailed mecahnism for the following reactions.Explanation / Answer
1.
first reaction is halogination of alkanes with bromine reagent in the presence of sunlight. all reactions in sunlight are free radical reactions. in the above example bromine is a reagent which splits into 2 bromine free radicals. one bromine radical reacts with the reactent and HBr is removed. as a result alkyl free radical is resulted preferably secondary free radical because it is stable than primary. this radical reacts with another free radical of bromine to form alkyl halides of both enantiomers. here racimic mixture is resulted because the possibility of attack of bromine free radical is same either from top or bottom.
2.
normally hydrogens bonded to a triple bond are acidic. tf we add basic reagent like NaNH2, it absorbs hydrogen from alkyne resulting alkynlyl carbanion. when this anion reacts with alkyl halides, the positive charged alkyl group attacks to the alkynyl carbanion to form substituted alkynes as products
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