ABSTRACT
Step 4: Sighting directly down the original C−C bond axis from front to back fore shortens this dimension and leaves an apparent two-dimensional representation. Using this perspective, identify the apparent angle formed between the selected atom/ group bond line connected to the front carbon and the selected atom/group bond line on the back carbon (Step 3). This apparent angle is the torsion angle (or dihedral angle) between these two atom/groups.
