future_vet
Apr29-07, 12:37 PM
(There is no problem statement etc.)
I am having a very hard time figuring out how to assign R/S stereochemistry on certain compounds. I can't rotate molecules in my head without making mistakes, and so I rotate them on paper.
Let's take this example:
http://avogadro.chem.iastate.edu/CHEM331/331FinalKeyF03.pdf
Go to page 6 please, we have to label compounds.
When a molecule has 2 atoms in the plane, + 1 in the front and 1 in the back, I can rotate them. I keep one atom fixed, usually #2 (4 being the smaller, 1 the largest), and rotate the other 3.
However, and this is where I need help, I don't know what to do when I have molecules such as the ones on the left, where 2 are in the back and 2 in the front, and none in the plane of the paper/screen.
How can I rotate those on paper in order to assign R/S stereochemistry?
Thank you for any help you can give me!
~J.
I am having a very hard time figuring out how to assign R/S stereochemistry on certain compounds. I can't rotate molecules in my head without making mistakes, and so I rotate them on paper.
Let's take this example:
http://avogadro.chem.iastate.edu/CHEM331/331FinalKeyF03.pdf
Go to page 6 please, we have to label compounds.
When a molecule has 2 atoms in the plane, + 1 in the front and 1 in the back, I can rotate them. I keep one atom fixed, usually #2 (4 being the smaller, 1 the largest), and rotate the other 3.
However, and this is where I need help, I don't know what to do when I have molecules such as the ones on the left, where 2 are in the back and 2 in the front, and none in the plane of the paper/screen.
How can I rotate those on paper in order to assign R/S stereochemistry?
Thank you for any help you can give me!
~J.