Master Organic Chemistry
M. Sankombo says
June 7, 2013 at 1:51 am
thank you soo much. this has been extremely helpful
E Blake says
June 16, 2013 at 11:07 am
Hi! Can you please explain, if there is a longer chain, eg 3 stereocentres, how do you know for the middle stereocentre how to draw it in 3d? Which way is ‘up’ (flat on the page) and which way would be ‘down) (ie going behind us)
Hope that makes sense, thanks!
June 19, 2013 at 8:59 pm
Always for a Fischer, the groups pointing on the side are coming out of the page. That’s all the information you need to figure out R/S. As far as drawing in 3D, if you have that information, it’s probably best to redraw the molecule in “zigzag” formation and then use the R/S information to draw in the stereocenters that way.
June 30, 2013 at 9:02 pm
If the highest priority substituent is going into the page(dashed line) do you flip from R to S/vice versa?
November 8, 2015 at 7:16 pm
MY SAVIOR!! Thanks so much for doing this!
December 10, 2015 at 3:01 pm
I think you made a mistake naming the carbons. Around the 8 minute mark, you said the two stereocenters were on C1 and C2 when they are actually on C2 and C3.
December 16, 2015 at 12:21 am
Exactly the video I needed. Thanks again! :)
May 31, 2016 at 9:52 am
So helpful and simplified! Thank you so much!
Youssef Osama says
August 16, 2016 at 2:17 am
Thankk you so much i have a midterm in 2 hours and i wasn’t able to identify priorities… can you kill our organic teacher :’D
May 19, 2017 at 12:34 am
This video helped a bunch!
Your email address will not be published. Required fields are marked *
Save my name, email, and website in this browser for the next time I comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.