Formation of a cis alkane from a trans alkene

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SUMMARY

The discussion focuses on synthesizing cis-1,2-epoxy-1-phenylhexane from (E)-1-phenyl-1-hexene using two distinct methods. The first method involves hydrogenating (E)-1-phenyl-1-hexene with poisoned Pd in ethanol to yield a cis alkene, followed by an E1 reaction with water and heat, and finally reacting with peroxy acid in THF to produce the desired epoxy. The second method hints at using bromination of a cis alkene, but the participant recognizes the challenge of converting a trans alkene directly to a cis product.

PREREQUISITES
  • Understanding of alkene hydrogenation techniques, specifically using poisoned palladium (Pd).
  • Knowledge of E1 reaction mechanisms and conditions.
  • Familiarity with peroxy acid reactions in organic synthesis.
  • Basic concepts of stereochemistry, particularly the differences between cis and trans isomers.
NEXT STEPS
  • Research the Jacobsen and Shi methods for asymmetric epoxidation.
  • Study the mechanism of E1 reactions in detail to understand product formation.
  • Explore the use of peroxy acids in organic synthesis, focusing on their role in epoxidation.
  • Investigate the bromination of alkenes and the subsequent reactions with water to form alcohols and epoxides.
USEFUL FOR

Chemistry students, organic chemists, and anyone involved in synthetic organic chemistry, particularly those interested in stereoselective reactions and epoxide formation.

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Homework Statement



Create cis-1,2-epoxy-1-phenylhexane from (E)-1-phenyl-1-hexene

Homework Equations





The Attempt at a Solution



My teacher asked for two ways to create this and I think I've got the first.

The first way was by treating (E)-1-phenyl-1-hexene with H2 and poisoned Pd in Ethanol. This creates a Cis product and then I react it with water and heat (E1 reaction) to form back an alkene but a cis alkene. Then I reacted it with peroxy acid in THF to form the product.

I'm unsure of the second way of creating this, but my teacher told us a hint and he said to look at problem 10.48 in our book. I've looked at the solution manual and they reacted the CIS alkene with Br2 and H2O and the epoxy formed by deprotonating the hydrogens on the water that attached to the alkene. In this reaction, however, a CIS starting material formed a CIS product which doesn't help me since I"m trying to form a CIS from a TRANS.
 
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That didn't stop you from converting the trans alkene first to a cis alkene in your first answer...

You allowed to use Jacobsen or Shi methods?
 

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