Elimination Reactions

This Chapter Contains Sections titled: E1cB and E2 Mechanisms Pyrolytic Reactions Acid Derivatives Halogen Derivatives Oxygen Derivatives Elimination Reactions in Synthesis Other Reactions References This chapter considers three possible mechanisms, the concerted, addition–elimination, and elimination–addition channels, via an isocyanate intermediate. The results demonstrated that the most favourable mechanism is the elimination–addition channel for all of the aminolysis reactions in the gas phase. The effect of steric hindrance in the reactions of chloride and cyanide anions with increasingly methylated alkyl iodides has been studied using crossed beam velocity map imaging. The chapter discusses pyrolytic reactions and its acid, halogen, and oxygen derivatives. Recent advances in the field of carbon–carbon bond formation involving decarboxylation as a key step have been reviewed. Pyridinium perrhenates were found to be effective catalysts at much lower temperatures than those in the previous reports, outperforming primary, secondary, and tertiary ammonium salts, while quaternary ammonium salts are effectively inactive.