Synthesis of Alkynes via Elimination In the same way that alkenes are produced by elimination of H-X,alkynes can be produced by elimination of 2 moles of H-X from a geminal or vicinal dihalide -HX R HKR三-R FAST H SLOW Strongly basic conditions(KOH or NaNH2,high temps)are required for this transformation,and often the molecule may not be stable to these conditions and may be destroyed or will rearrange. Ch09 Alkynes (landscape) Page 8 Ch09 Alkynes (landscape) Page 8 Synthesis of Alkynes via Elimination In the same way that alkenes are produced by elimination of H-X, alkynes can be produced by elimination of 2 moles of H-X from a geminal or vicinal dihalide. Strongly basic conditions (KOH or NaNH2, high temps) are required for this transformation, and often the molecule may not be stable to these conditions and may be destroyed or will rearrange