If you have a modeling kit use it to help you solve the following practice problems.Contradiction with Banach Fixed Point Theorem However, it is very useful when learning organic chemistry to use models. If the lowest priority bond is not pointing to the back, mentally rotate it so that it is. IF YOU DO NOT HAVE A MODELING KIT: remember that the dashes mean the bond is going into the screen and the wedges means that bond is coming out of the screen. Then determine the direction from the highest priority substituent to the lowest: clockwise (R) or counterclockwise (S). When using a model, make sure the lowest priority is pointing away from you. USE YOUR MODELING KIT: Models assist in visualizing the structure.
![why does chemdraw number structures when you draw by naming why does chemdraw number structures when you draw by naming](https://www.rdworldonline.com/wp-content/uploads/2020/11/COPlus-WP-Figures-3.png)
Because the 4th highest priority atom is placed in the back, the arrow should appear like it is going across the face of a clock.
![why does chemdraw number structures when you draw by naming why does chemdraw number structures when you draw by naming](http://mason.gmu.edu/~sslayden/Chem350/manual/graphics/cs-4.jpg)
![why does chemdraw number structures when you draw by naming why does chemdraw number structures when you draw by naming](https://media.cheggcdn.com/study/e94/e94524ca-7ec1-4fa2-9b03-7c729b38df1e/image.png)
A substituent with a higher atomic number takes precedence over a substituent with a lower atomic number. First, examine at the atoms directly attached to the stereocenter of the compound.