Geometrical approach to central molecular chirality: a chirality   selection rule
  Chirality is of primary importance in many areas of chemistry and has been extensively investigated since its discovery. We introduce here the description of central chirality for tetrahedral molecules using a geometrical approach based on complex numbers. According to this representation, for a molecule having n chiral centres, it is possible to define an index of chirality. Consequently a chirality selection rule has been derived which allows the characterization of a molecule as achiral, enantiomer or diastereoisomer. 
S. Capozziello, A. Lattanzi