Preferred Label : chirality plane; 
IUPAC definition : A planar unit connected to an adjacent part of the structure by a bond which results
               in restricted torsion so that the plane cannot lie in a symmetry plane. For example
               with ( i E /i )-cyclooctene the chiral plane includes the double bond carbon atoms
               and all four atoms attached to the double bond; with a monosubstituted paracyclophane
               the chiral plane includes the monosubstituted benzene ring with its three hydrogen
               atoms and the three other atoms linked to the ring (i.e. from the substituent and
               the two chains linking the two benzene rings).; 
         
         
            Origin ID : C01062; 
See also
                  
                  
                
            
          
         
         
         A planar unit connected to an adjacent part of the structure by a bond which results
            in restricted torsion so that the plane cannot lie in a symmetry plane. For example
            with ( i E /i )-cyclooctene the chiral plane includes the double bond carbon atoms
            and all four atoms attached to the double bond; with a monosubstituted paracyclophane
            the chiral plane includes the monosubstituted benzene ring with its three hydrogen
            atoms and the three other atoms linked to the ring (i.e. from the substituent and
            the two chains linking the two benzene rings).