Organic Chemistry: are these answers correct?

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SUMMARY

The discussion focuses on verifying answers related to organic chemistry reactions, specifically involving reagents and mechanisms. The user presents their answers to several problems, including the use of Br2 and H3O+ for reaction 5a, and a sequence of reagents including t-BuO- and HBr with ROOR for reaction 5b. The user also mentions the possibility of a Michael addition and the importance of preventing self-condensation in their reasoning. The provided images serve as visual aids for the answers given.

PREREQUISITES
  • Understanding of organic reaction mechanisms
  • Familiarity with reagents such as Br2, H3O+, and Gilman reagents
  • Knowledge of Michael addition and intramolecular reactions
  • Experience with interpreting chemical structures and reaction schemes
NEXT STEPS
  • Research the mechanism of Michael addition in organic chemistry
  • Study the role of Gilman reagents in nucleophilic substitutions
  • Learn about the conditions and outcomes of reactions involving t-BuO- and ROOR
  • Explore the concept of self-condensation in carbonyl chemistry
USEFUL FOR

Students and professionals in organic chemistry, particularly those studying reaction mechanisms and reagent applications. This discussion is beneficial for anyone looking to deepen their understanding of complex organic reactions and their interpretations.

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Are the answers I got correct?

http://img162.imageshack.us/img162/4007/untitled6kq1.png

What I got:

1. a.
http://img162.imageshack.us/img162/2193/1a3bp.png

1. b.
http://img81.imageshack.us/img81/4995/1b9ov.png


http://img84.imageshack.us/img84/4194/515oo.png

http://img84.imageshack.us/img84/7725/529fc.png

http://img114.imageshack.us/img114/4369/538gf.png

What I got:

5. a. Br2 and H3O+. Then a Gilman reagent of (PhCHCHCH2)2CuLi followed by THF.

5. b. First Br2 w/ hv. Then t-BuO- and finally HBR with ROOR.

5. c. CH3O- and HCl (two step), rearrangement, more CH3O- / HCl and then intramolecular reaction.
 
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Just some remarks

1)may be a michael's addition?

2)You would probably have the attack on the carbonyl ketone, which is added later to prevent self-condensation reactions.