Introduction Alkynes contain a triple bond. General formula is C.H2n-2 Two elements of unsaturation for each triple bond. · Some reactions are like alkenes: addition and oxidation. · Some reactions are specific to alkynes
Reactivity of C=C C—C Electrons in pi bond are loosely held Electrophiles are attracted to the pi electrons. · Carbocation intermediate forms. Nucleophile adds to the carbocation. · Net result is addition to the double bond
Classes of Halides Alkyl: Halogen, X, is directly bonded to sp3 carbon. Vinyl: X is bonded to sp2 carbon of alkene. Aryl: is bonded to sp2 carbon on benzene ring. Examples:
