Synthesis and Reactions of Alkynes
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12 Terms
What reagents are used to make a terminal alkyne?
NaNH2 (excess)
H2O
What reagents are used to make an internal alkyne?
NaNH2
H2O
How is a cis alkene made in hydrohalogenation of alkynes?
1 equivalent HX reacts with a terminal alkyne
What happens when an alkyne reacts with excess HX?
A geminal dihalide (2X) is produced
What happens when 1 equivalent X2 reacts with a terminal alkyne?
Halogenation, X is added on either side of an alkene that is produced
What happens when excess X2 reacts with a terminal alkyne?
4 halogens are added across a single carbon bond
What reagents are used in an acid-catalyzed hydration of alkynes?
HgSO4
H2SO4, H2O
What occurs when H2 and Pt are reacted with an internal alkyne?
4 hydrogens are added on either side of a single carbon bond
What happens when H2 and Lindlar’s Catalyst react with an internal alkyne?
Two hydrogens are added cis to an alkene
What occurs when Na and NH3 (l) are reacted with an internal alkyne?
Two hydrogens are added trans on an alkene
How to make a terminal alkyne?
NaNH2 (excess)
H2O
How to make an internal alkyne?
NaNH2
H2O