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Well if you are referring to the general method to "synthesize" an alkyne, then the easiest way lets say you want ethylene ("ethyne"), the simplest two carbon alkyne, it would be obtained from adding KOH @ 200 degrees Celsius to 1,1-dibromoethane. The result is an internal alkyne, thus ethylene. In case you wanted an external alkyne you would the use NaNH2 @ 150 degrees Celsius. That is just basic, for it could get more complicated!!!

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Q: What are the general methods for the preparation of alkynes?
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There are more than two methods to prepare alkynes, but for example you can do a double elimination reaction by way of E2 (double dehydrohalogenation), a more direct way and using one reaction only you can use KOH @ 200 degrees Celsius for a central alkyne, or NaNH2 @ 150 degrees Celsius for a terminal alkyne.


How are alkanes alkenes and alkynes similar How are they different from each other?

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