Organic Chemistry: are these answers correct?

AI Thread Summary
The discussion revolves around verifying the correctness of answers related to organic chemistry reactions. The user presents several reaction mechanisms involving reagents like Br2, H3O+, and Gilman reagents, detailing specific steps for each part of the question. There are mentions of potential mechanisms such as Michael's addition and considerations for preventing self-condensation in reactions involving carbonyl compounds. The overall focus is on ensuring the accuracy of the proposed answers and the reasoning behind the chosen reagents and steps. The thread highlights the complexity of organic reactions and the importance of proper methodology in achieving correct results.
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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.
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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