July 13, 2024, 10:06:09 AM
Forum Rules: Read This Before Posting


Topic: "ent" ligand?  (Read 6608 times)

0 Members and 1 Guest are viewing this topic.

Offline faust

  • Regular Member
  • ***
  • Posts: 72
  • Mole Snacks: +3/-13
  • I'm a mole!
"ent" ligand?
« on: May 13, 2006, 12:32:09 PM »
Hello.

I have a ligand in a publication which is : PPF-P(tBu)2 (same as JOSIPHOS but with 2 t-Bu in place of 2 Cy).

And they write : ent-PPF-P(tBu)2. What does "ent" mean?

Thank you


Offline Albert

  • Lonely Wanderer
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1050
  • Mole Snacks: +112/-22
  • Gender: Male
  • Half Decent Pharmaceutical Chemist
Re: "ent" ligand?
« Reply #1 on: May 13, 2006, 01:02:51 PM »
You know E-Z nomenclature, don't you? E is to trans as Z is to cis.

E comes from German entgegen, which means (more or less) 'contrary to'; Z from zusammen, 'together'.

In my opinion, Ent stands for E.

Offline faust

  • Regular Member
  • ***
  • Posts: 72
  • Mole Snacks: +3/-13
  • I'm a mole!
Re: "ent" ligand?
« Reply #2 on: May 13, 2006, 01:22:23 PM »
but in this ligand I don't have any double bond...

Offline Albert

  • Lonely Wanderer
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1050
  • Mole Snacks: +112/-22
  • Gender: Male
  • Half Decent Pharmaceutical Chemist
Re: "ent" ligand?
« Reply #3 on: May 13, 2006, 01:23:58 PM »
Could you draw them?

Offline movies

  • Organic Minion
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1973
  • Mole Snacks: +222/-21
  • Gender: Male
  • Better living through chemistry!
Re: "ent" ligand?
« Reply #4 on: May 14, 2006, 02:56:39 PM »
Usually that means they are using the enantiomer of whatever is drawn in the picture.  So, if the draw (S)-BINAP and label it as 1, then ent-1 is (R)-BINAP.

Offline faust

  • Regular Member
  • ***
  • Posts: 72
  • Mole Snacks: +3/-13
  • I'm a mole!
Re: "ent" ligand?
« Reply #5 on: May 15, 2006, 04:35:25 AM »
Thank you very much for your help

Sponsored Links