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Chapter 9: Q. 9-9-8 P-c (page 274)

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 When 2 equivalent is present alkyne convert to alkane.

Step by step solution

01

Lindlar catalyst

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

02

Formation of cis-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

How would you carry out the following reactions to introduce deuterium into organic molecules?

(a)

b.

c.

d.

Arrange the carbocations below in order of increasing stability.

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

Show the terminal alkyne and alkyl halide from which the following products can be obtained. If two routes look feasible, list both.

a.CH3CH2CH2C鈮�CH

How would you carry out the following conversions? More than one

step is needed in each case.
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