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Chapter 9: Q11P (page 263)

How would you prepare cis-2-butene starting from propyne, an alkyl halide, and any other reagents needed? This problem can鈥檛 be worked in a single step. You鈥檒l have to carry out more than one reaction.

Short Answer

Expert verified

Reagents are the compounds which are used for conversion or addition or elimination of different functional groups from the reactant species.

Step by step solution

01

Definition reagents

Reagents are the compounds which are used for conversion or addition or elimination of different functional groups from the reactant species.

02

Formation of cis-2-butene

Given reactant is propyne

The formation of product will takes place by the use of three reagents:

1 NaNH2- used for removal of acidic proton

2. CH3Br- addition of alkyl halide to add one more carbon in the chain

3. H2, Lindlar鈥檚 catalyst 鈥� addition of from same side

Hence the formation of Cis-2-butene occurs.

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Most popular questions from this chapter

Which of the following bases could be used to deprotonate 1-butyne?

(a)

Draw structures corresponding to the following names:

(a)3,3-Dimethyl-4-octyne

(b)3-Ethyl-5-methyl-1,6,8-decatriyne

(c)2,2,5,5-Tetramethyl-3-hexyne

(d)3,4-Dimethylcyclodecyne

(e)3,5-Heptadien-1-yne

(f)3-Chloro-4,4-dimethyl-1-nonen-6-yne

(g)3-sec-Butyl-1-heptyne

(h)5-tert-Butyl-2-methyl-3-octyne

Question: How would you carry out the following reactions?

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

Question: Each of the following syntheses requires more than one step. How

would you carry them out?

(a)

b)
See all solutions

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