IUPAC definition : The spatial arrangement of the atoms affording distinction between stereoisomers which
can be interconverted by rotations about formally single bonds. Some authorities extend
the term to include inversion at trigonal pyramidal centres and other polytopal rearrangements.;
The spatial arrangement of the atoms affording distinction between stereoisomers which
can be interconverted by rotations about formally single bonds. Some authorities extend
the term to include inversion at trigonal pyramidal centres and other polytopal rearrangements.