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If this problem is graded: 50 Problem #10. Some reactions are kinetically controlled and other reactions are controlled. In many cases, which type of control operates depends Onlyand at higher te temperatures we should focus on kinetics (which product forms the fas we should focus on thermodynamics (which product is the most stable?), on the temperature: at low fastest?) and at higher temperatures The important thing to realize is that in some reactions the product that forms the most the product that is the most stable! quickly is NOT As an example, consider the addition of bromine to 1,3-butadiene: Br Br2 Br 1,2-addition less stable 1,4-addition favored at low temp. favored at high temp. more stable a) Explain why (E)-1,4-dibromobut-2-ene is more stable than 3,4-dibromobut-1-ene. What part of the structure do you focus on to figure this out? Three possible structures for the intermediate of this reaction are shown below. :Br Br b) Fill in all of the implied hydrogen atoms on these structures. c) Whic products shown above? Explain. h of these intermediate structures is consistent with formation of both the 1,2- and 1,4-addition
If this problem is graded: 50 Problem #10. Some reactions are kinetically controlled and other reactions are controlled. In many cases, which type of control operates depends Onlyand at higher te temperatures we should focus on kinetics (which product forms the fas we should focus on thermodynamics (which product is the most stable?), on the temperature: at low fastest?) and at higher temperatures The important thing to realize is that in some reactions the product that forms the most the product that is the most stable! quickly is NOT As an example, consider the addition of bromine to 1,3-butadiene: Br Br2 Br 1,2-addition less stable 1,4-addition favored at low temp. favored at high temp. more stable a) Explain why (E)-1,4-dibromobut-2-ene is more stable than 3,4-dibromobut-1-ene. What part of the structure do you focus on to figure this out? Three possible structures for the intermediate of this reaction are shown below. :Br Br b) Fill in all of the implied hydrogen atoms on these structures. c) Whic products shown above? Explain. h of these intermediate structures is consistent with formation of both the 1,2- and 1,4-addition
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Patrina SchowalterLv2
18 Apr 2019
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