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Chapter 9-8 - Synthesis of Alkynes by Elimination Reactions
Organic Chemistry 307: Chapter 9 - Alkynes; Section 8 - Synthesis of Alkynes by Elimination Reactions
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Organic Chemistry
Undergraduate 3
11/15/2011

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Term
Dehydrogenation of a __________ or __________ dihalide gives a vinyl halide.
Under strongly __________ conditions, a second dehydrohalogenation may occur to form an __________.
Definition
1) Geminal
2) Vicinal
3) Basic
4) Alkyne
Term
A dehydrohalogenation which occurs under extremely __________ conditions, in which fused (molten) or alcoholic __________ is sealed in a tube and is usually heated to temperatures close to 200 degrees Celsius.
__________ __________ is also used for the double dehydrohalogenation; however, since it is a much stronger base than hydroxide, the reaction takes place at a (lower/higher) temperature.
Definition
1) Basic
2) KOH
3) Sodium amide
4) Lower
Term
In the synthesis of alkynes, __________ elimination tends to give the most stable (internal/terminal) alkyne.
Definition
1) KOH
2) Internal
Term
In the synthesis of alkynes, __________ __________ elimination tends to give a (internal/terminal) alkyne since the acetylenic hydrogen is deprotonated by the __________ ion; this gives an __________ ion as the initial product.
Definition
1) Sodium amide
2) Terminal
3) Amide
4) Acetylide
Term
*Synthesis of Alkynes*
1. __________ of acetylide ions
2. Additions to __________ groups.
3. Double __________ of alkyl __________.
Definition
1) Alkylation
2) Carbonyl
3A) Dehydrohalogenation
3B) Dihalides
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