Alkyne Reactions
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unsaturated hydrocarbons that contain a -C ΞC- and such that one sp hybridized carbon atom
alykne
has linear geometry
alkyne
similar to alkenes, thesealso contain pi electrons that are capable of undergoing electrophilic addition reaction
alkyne
happens in the presence of hydrogen gas and metal catalyst also produces alkyne just like in alkene
hydrogenation
catalyst in hydrogenation in alkynes
Lindlar’s Catalyst (Pd in CaCO3 and quinoline) Na in NH3
addition of to an alkyne follows Markovnikov’s rule and one may use one or two moles of the reagent
HX and X2
reactions in alkyne
hydrogenation halohydrogenation halogenation hydration oxidation
requires the presence of mercuric sulfate and forms a ketone instead of an alcohol
hydration
the number of carbon chain in an alkyne can be increased by reaction of a terminal alkyne with a very strong base followed by reaction with alkyl halide (RX).
formation of acetylide ion
– have an acidic proton and therefore reacts with metal or very strong base
terminal alkyne
the products formed in the oxidation of alkyne depends on the type of alkyne; internal or terminal alkyne
oxidation reaction