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Mobile App Chapter 9: Q8 P-c (page 274)
Question:Using any alkyne needed, how would you prepare the following alkenes?
(c) 3-Methyl-1-pentene
Short Answer
Step by step solution
Step-by-Step Solution Step1: Lindlar catalyst
It’s the reagent used in the react to convert the akyne to alkene by hydrogenation when 1 equivalent When 2equivalent is present alkyne convert to alkane.
Formation ofcis-3-Heptene
Alkyne hydrogenation to alkene occurs when less active Lindlar catalyst is used which is a finely divided palladium metal with lead acetate and quinoline, an aromatic amine. The hydrogenation occurs with syn stereochemistry
Reaction with lindlar catalyst
When alkyne react with lindlar catalyst then it break the three out of one bond and convert alkyne to alkene by the addition of hydrogen to the atom and form alkene as shown:
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