... The Chemistry of C-C π-Bonds - - Alkene and Alkyne chemistry I Alkene chemistry Structures and influence of orbitals on reactivity: How alkenes react and why? Typical reactions of alkenes: ... reduction of the alkene The Chemistry of C-C π-Bonds - 18 - Alkynes Alkynes have two π-bonds that are orthogonal R1 R1 R2 R2 See Prof Dixon’s course for methods to make alkynes via elimination of ... Borderline N3-, -CN, RNH2, Br- Soft I-, RS-, RSH, R3P, R2S Soft = The Chemistry of C-C π-Bonds - 38 - Examples of addition of HARD and SOFT nucleophiles: Addition of thiolate anion: O SPh PhSH,...