Alkynes in Synthesis and Retrosynthesis

Example Outline a synthesis of 1,2-epoxybutane using ethyl bromide and acetylene as sources for all the carbon atoms. 

We determine the last step in the synthesis by recognizing that the most common route to epoxides is via the reaction of alkenes with peroxy acids. 

The problem now is to prepare 1-butene from ethyl bromide and acetylene, a process that clearly requires C—C bond formation. We can do this in two operations, shown retrosyn-thetically as  

Outline a synthesis of ( )-H2C=CHCH2CH2CH=CHCH3 from propyne, organic compounds with four carbons or fewer, and any necessary inorganic reagents. 

Section 9.1 Alkynes are hydrocarbons that contain a carbon-carbon triple bond. Simple alkynes having no other functional groups or rings have the general formula C H2 2- Acetylene is the simplest alkyne. 

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