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Chapter 7: Q19P (page 304)

Describe the alkyne you would start with and the reagents you would use if you wanted to Synthesize

a. Pentane. b. Cis-2-butene. c. trans-2-pentene. d. 1-hexene.

Short Answer

Expert verified

1. H2 in presence of Pd/C becomes strong reducing agent and form primary alkane from alkyne.

2. H2 in presence of lindlar catalyst stops the reaction at alkene stage.

3. Na/NH3cannot be used to reduce terminal alkynes, because Na will remove the hydrogen that is attached to the sp carbon of the terminal alkyne.

Step by step solution

01

Some conclusions

1. H2 in presence of Pd/C becomes strong reducing agent and form primary alkane from alkyne.

2. H2 in presence of lindlar catalyst stops the reaction at alkene stage.

3. Na/NH3cannot be used to reduce terminal alkynes, because Na will remove the hydrogen that is attached to the sp carbon of the terminal alkyne.

02

Final answer

So the final reactions are-

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Most popular questions from this chapter

Which carbocation is more stable?

Which of the following bases can remove a proton from a terminal alkyne in a reaction that favors products?

How can the following compounds be prepared using ethyne as the starting material?

A student was given the structural formulas of several compounds and was asked to give them systematic names. How many did she name correctly? Correct those that are misnamed.

a. 4-ethyl-2-pentyne b. 1-bromo-4-heptyne c. 2-methyl-3-hexyne d. 3-pentyne

a. Starting with 3-methyl-1-butyne, how can you prepare the following alcohols?

1. 2-methyl-2-butanol

2. 3-methyl-1-butanol

b. In each case, a second alcohol would also be obtained. What alcohol would it be?
See all solutions

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