The groups on the vertical line in Fischer’s formula represent two groups on the solid lines in the flying-wedge formula. On the other hand, If the two solid lines in the wedge formula are bent to the left, then the group on the solid wedge is placed on the left in the horizontal line of Fischer’s formula.ĬONVERTING THE FISCHER FORMULA TO FLYING-WEDGE FORMULA If the two solid lines in the wedge formula are bent to the right, then the group on the solid wedge is placed on the right in the horizontal line of Fischer’s formula. The other two groups (on solid wedge and broken wedge) are placed on the horizontal line in Fischer’s formula. The two solid lines of the flying-wedge formula are written as the vertical line in Fischer’s formula. It is a method of representing the three-dimensional structure of an organic molecule in which two solid lines characterize bonds on the plane of the paper, a solid wedge shows the bond coming out of the plane, and a dashed (broken) wedge shows the bond below the plane of the paper.ĬONVERTING FLYING-WEDGE FORMULA TO FISCHER FORMULA However, the exchange of two groups by an even number of times does not change the configuration at the chiral center. The exchange of any two groups in the Fischer formula by an odd number of times changes the configuration at the chiral center. Rotation of groups in the Fischer formula by 90 ° changes the configuration at the chiral center.Ĥ. Rotation of three groups on the chiral center in a clockwise or anticlockwise direction, without disturbing the fourth group, also does not change the configuration at the chiral center.ģ. Rotation by 180 ° in a clockwise or anticlockwise direction, without lifting from the plane of the paper, is allowed and this operation does not change the configuration at the chiral center.Ģ. There are certain operations that can be performed on a Fischer projection that retain or change the configuration at the tetrahedral carbon center in the Fischer projection formula. The vertical lines are presumed to lie below the plane of the paper and the horizontal lines are presumed to lie above the plane. The four bonds at the tetrahedral carbon are represented by two vertical and two horizontal straight lines. It is a two-dimensional depiction of an organic molecule at the tetrahedral carbon center.
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