This method involves a convenient method of converting aldehydes and ketones into alkenes by using a special class of compounds called phosphorous yields, also called wittig reagent. Primary or secondary alkyl halide is first treated with triphenyl phosphin’e the phosphonium halide produced in the above reaction is converted into phosphorane by adding a strong base like C6H5Li on n-C4H9-Li. Phosphorane is stabilized by resonance.
The Triphenyl group of phosphorane has a strong tendency to pull oxygen atom of the aldehyde or ketone forming alkene.
(R,R', R" and R"' may be hydrogen or any alkyl group)
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