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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

Expert verified

It鈥檚 the reagent used in the react to convert the akyne to alkene by hydrogenation when 1 equivalent H2When 2equivalent H2is present alkyne convert to alkane.

Step by step solution

01

Step-by-Step Solution Step1: Lindlar catalyst

It鈥檚 the reagent used in the react to convert the akyne to alkene by hydrogenation when 1 equivalent H2When 2equivalent H2is present alkyne convert to alkane.

02

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

03

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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Most popular questions from this chapter

A cumulene is a compound with three adjacent double bonds. Draw an orbital picture of a cumulene. What kind of hybridization do the two central carbon atoms have? What is the geometric relationship of the substituents on one end to the substituents on the other end? What kind of isomerism is possible? Make a model to help see the answer.

R2C=C=C=CR2

A cumulene

Question: Identify the reagents a鈥揷 in the following scheme:

Using any alkyne needed, how would you prepare the following alkenes?

(a) trans-2-Octene

Using any alkyne needed, how would you prepare the following alkenes?

(b) cis-3-Heptene

What alkyne would you start with to prepare each of the following compounds by a hydroboration鈥搊xidation reaction?
See all solutions

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