preparation of alkenes from alkynes
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Answer:
the above reactions convert alkynes to alkenes
Explanation:
Alkyne to alkene conversion is carried out by the reduction of alkynes with hydrogen in the presence palladised charcoal.
The charcoal used is moderately deactivated with the help of quinoline or sulphur compounds.
This reaction results in the formation of alkenes. Palladised charcoal which is halfway deactivated is called as Lindlar’s catalyst.
the alkenes obtained from the above reaction have cis geometry.
In order to form trans alkenes, alkynes are made to undergo reduction with sodium in liquid ammonia.
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