Chemistry question on enatiomers

[Turtle]

Does anybody know an easy way to find R or S, if the lowest priority group is a "line" bond, instead of being a dashed or wedged bond?

I know the trick that you use if the lower priority group is a wedge...but I can't seem to find an easy way to find R or S if the lowest priority group is a "line" bond!

Can anyone help me?

[lzxnl]

Rotate the molecule in your mind to see what happens if you convert the lower priority group into a wedge

[Turtle]

Rotate the molecule in your mind to see what happens if you convert the lower priority group into a wedge

I can't rotate molecules in my head. I have tried, and I keep getting them wrong. I have also tried watching videos, reading articles on websites on how to rotate them, but it's just not helping me.

Is there no other way other than to rotate them in your head in the lowest priority group is a "normal line" bond?

[Turtle]

Yes!!! I found a page which shows you how to figure out my problem!!

http://www.utdallas.edu/~scortes/ochem/OChem1_Lecture/Class_Materials/09_stereo_notes.pdf

It's the section under the heading "SHORCUTS FOR ASSIGNING ABSOLUTE CONFIGURATION ON PAPER"

[scribble]

being able to rotate them in your mind is quite handy. when you deal with more complex stereochemistry, its becomes fairly inconvenient to rely on rules like that.
maybe get a molecular model kit and build your molecules and rotate them physically until you get the hang of visualising them in your head.