« previous next »

Author Question: Identify the chiral center in the product from this experiment. Is the product optically active? ... (Read 101 times)

MGLQZ

  • Hero Member
  • *****
  • Posts: 579
on: Aug 23, 2018
Identify the chiral center in the product from this experiment. Is the product optically active? Explain your answer.

Question 2

Examine the mechanism and the intermediates in the reaction to explain why the thiamine-catalyzed synthesis of benzoin is sensitive to electron-withdrawing and electron-donating substituents in the four position (the para position) of the benzene ring of the aldehyde. For each of the steps in the mechanism, indicate whether electrondonating or electron-withdrawing substituents stabilize the intermediate.


kristenb95

  • Sr. Member
  • ****
  • Posts: 318
Reply #1 on: Aug 23, 2018
Answer to Question 1



The stereocenter has been labeled with an asterisk. None of the starting materials or the catalyst are chiral, so the product will not be optically active. There is no means of generating optical activity when there is none to begin with.

Answer to Question 2



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

MGLQZ

  • Hero Member
  • *****
  • Posts: 579
Reply #2 on: Aug 23, 2018
Thank you!


kristenb95

  • Sr. Member
  • ****
  • Posts: 318
Reply #3 on: Aug 23, 2018
Always glad to help...


« previous next »
 

Did you know?

The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Pap smear. Cells of the cervix (shown in the center) change in appearance as they progress through Pap smear. Cells of the cervix (shown in the center) change in appearance as they progress through
The Experiment by Albrecht, 1978 The Experiment by Albrecht, 1978
Pavlov’s Salivary Conditioning Experiment (2 of 2) Pavlov’s Salivary Conditioning Experiment (2 of 2)
Summary of the Hershey–Chase experiment demonstrating that DNA, and not protein Summary of the Hershey–Chase experiment demonstrating that DNA, and not protein
The Hershey-Chase experiment The Hershey-Chase experiment
Movement of fluids in the body is accomplished by A. osmosis, B. diffusion, or C. active transport Movement of fluids in the body is accomplished by A. osmosis, B. diffusion, or C. active transport
Video: Protein catabolism - deamination

For a complete list of videos, visit our video library