text: His major scientific achievements are: the discovery of the catalytic effect of fluoride ion; 
  the discovery of the zwitterionic bicyclobutane; 
  the formulation of the leading theory on the origin of the α-effect; 
  the relationship between nucleophilicity and the Periodic Table; 
  the discovery of a molecule forty times harder than diamond in one dimension; 
  the first discovery of a molecule having a negative Poisson’s ratio; 
  the formulation of guidelines and methods for the use of SmI2 in organic reactions.