Alkynes Flashcards
Alkynes has the prefix _______
yne
Terminal alkynes
Monosubstituted acetylenes
![](https://s3.amazonaws.com/brainscape-prod/system/cm/353/107/960/a_image_thumb.png?1628594117)
Internal Alkynes
Dissubstituted acetlyenes
![](https://s3.amazonaws.com/brainscape-prod/system/cm/353/108/021/a_image_thumb.png?1628594159)
What are the bases used to protonate an acetylene or terminal alkynes?
- CH9-
- H2N
- H-
- Acetylide ion
When preparing alkynes they can be formed from dihalides via ___________
Strong base
Alkyl dihalides can be turn into alkynes via _______ twice
E2 reactioon
Geminal dihalide
Both halogens are connected to the same carbon
Vicinal dihalides
Two halogens are connected to adjacent carbons
_________ & __________ are the bases used for turning alkyl dihalides into alkynes
NaNH2, NH3
A terminal alkyne can be prepared with ___________ soidum amide
Excess (xx)
Sodium amide
NaNH2
Alkynes can undergo catalytic hydrogenation & also can use a poisoned catalyst to covert alkyne into a _______ alkyne
Cis Alkyne
What are the types of poisoned catalyst that can be used to form a cis alkene?
Lindlar’s Catalyst
What is the sterochemistry of catalylic hydrogenation involving alkynes?
Syn Addition
______________ reduction can turn alkynes into trans alkenes
Dissolving metal reduction
What is the reagents used in a dissolving metal reduction?
Na in NH3