July 08, 2020, 10:25:21 AM
Forum Rules: Read This Before Posting


Topic: Absolute and Relative Configurations  (Read 9930 times)

0 Members and 1 Guest are viewing this topic.

FictionDurden

  • Guest
Absolute and Relative Configurations
« on: October 19, 2004, 12:39:53 AM »
For an upcoming exam, I will have to compare and contrast absolute and relative configurations. The problem is, I need  3 compares and 3 contrasts for these configurations. I am not totally sure of what absolute and relative configurations are. I can only think of 1 contrast, and that is their definitions. *delete me*

Offline movies

  • Organic Minion
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1973
  • Mole Snacks: +222/-20
  • Gender: Male
  • Better living through chemistry!
Re:Absolute and Relative Configurations
« Reply #1 on: October 19, 2004, 04:38:14 PM »
Think about the other implications of the definitions.

Why don't you start by telling us the definitions and we can help you from there.

FictionDurden

  • Guest
Re:Absolute and Relative Configurations
« Reply #2 on: October 19, 2004, 05:20:11 PM »
Absolute configuration - the detailed stereochemical picture of a molecule, including how the atoms are arranged in space. Alternatively, the (R) and (S) configuration at each chirality center.

Relative configuration - the experimentally determined relationship between the configurations of two molecules, even though we may not know the absolute configuration of either.

Offline movies

  • Organic Minion
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1973
  • Mole Snacks: +222/-20
  • Gender: Male
  • Better living through chemistry!
Re:Absolute and Relative Configurations
« Reply #3 on: October 19, 2004, 10:05:25 PM »
Okay, good.

So for one, suppose you had a molecule and you knew the relative configuration of two of the groups.  What difference would it make if you knew the absolute configuration?

FictionDurden

  • Guest
Re:Absolute and Relative Configurations
« Reply #4 on: October 19, 2004, 10:53:38 PM »
You wouldn't have to do an experiment?

Offline movies

  • Organic Minion
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1973
  • Mole Snacks: +222/-20
  • Gender: Male
  • Better living through chemistry!
Re:Absolute and Relative Configurations
« Reply #5 on: October 20, 2004, 11:56:46 AM »
You would.  But what is a very simple experiment that you could do to distinguish a molecule that has an absolute configuration from a molecule where you only know the relative configuration (if the two molecules are the same otherwise).

Sponsored Links