According to the helix theory, the algebraic sum value of all rotations of dihedral angle helix is equal to zero in the structure of 1,3-disubstituted cyclohexane derivatives.

• 按照螺旋理论,1,3-二取代环已烷衍生物的结构中存在的二面角螺旋旋光度代数和为零,不应具有旋光性,但是它们却是光学活性的。