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Keywords:

  • Tetramethylcyclobutadiene;
  • Cyclobutadiene

Abstract

Attempts to prepare cyclobutadiene, which is primarily of theoretical interest, or one of its derivatives have so far led only to products structurally closely related to tetramethylcyclobutadiene. It has not been possible to prepare the compound itself nor to establish unequivocally that it occurs as a reaction intermediate.