Complcated Chemistry Reaction - impossible?

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SUMMARY

The discussion revolves around a complex chemistry reaction involving organolithium and Grignard reagents. The first step involves a 221 reaction where the use of peroxides leads to the formation of an anti-Markovnikov bromide, while HBr results in a Markovnikov bromide. The second step generates either an organolithium or Grignard reagent, depending on the reactants used. The final step involves a reaction between a strong acid (D2O) and a strong base (organometallic carbon), yielding a deuterated alkane.

PREREQUISITES
  • Understanding of 221 reactions in organic chemistry
  • Knowledge of Markovnikov and anti-Markovnikov addition mechanisms
  • Familiarity with organolithium and Grignard reagents
  • Concepts of acid-base reactions in organic synthesis
NEXT STEPS
  • Study the mechanisms of 221 reactions in organic chemistry
  • Learn about the differences between Markovnikov and anti-Markovnikov addition
  • Research the preparation and applications of Grignard reagents
  • Explore the role of deuterated alkanes in chemical reactions
USEFUL FOR

Chemistry students, organic chemists, and researchers involved in synthetic organic chemistry who are looking to deepen their understanding of complex reaction mechanisms.

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Complcated Chemistry Reaction - impossible??

2A_zpsa0929c4f.png

2BCD_zps7d3f261c.png


Help :(
My notes say:

Step 1 is a 221 reaction. If peroxides are used in your version, then the anti-Markovnikov bromide is formed. If your version had only HBr, the the Markovnikov bromide is formeed.

Step 2 creates organolithium or Grignard reagent (depending on your version).

Steps 3 is a strong acid (D2O) - strong base (organometallic carbon) reaction which gives a deuterated alkane.

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I managed to get A right but I can't get B right :(
 
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Why would you think you would get a grignard when you treat with lithium? Why does your answer show four carbons when your starting material is propene?
 


What exactly is the grignard reaction then?
Don't you just remove a C=C bond and make it a single C-C bond and add a another –Br bond to the end of one C atom ??
 

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