In order to convert from one depiction to another certain rules have to be followed. Firstly, it must be noted that Fischer projection always depicts the molecule in eclipsed form. Thus, whenever, a Fischer projection is converted to Newman or Sawhorse projection, it results in an eclipsed form of the molecule which is then converted to the more stable staggered form. Similarly, while converting a Newmann or a Sawhorse projection to Fischer projection, the molecule must be first depicted in eclipsed form before conversion.

For example, to convert a flying wedge projection to Fischer projection, firstly, the bonds which are supposed to be on the plane are to be decided which must be two bonds, one vertical and horizontal connected to a carbon (Figure 1). If the vertical bond to the right is chosen, and the other horizontal bond is bent to the right, the remaining vertical bond group is depicted above the plane.

Figure 1

On the other hand, if the vertical bond to the left is chosen, and the other horizontal bond is bent to the right, the remaining vertical bond group is depicted below the plane (Figure 2).

Figure 2

 

Step1: Put the groups at the vertical bonds on the tails of the “Y” of sawhorse projection.

Step 2: Put the other groups on the head of “Y”.