Alkyne Catalytic Hydrogenation Flashcards
1
Q
purpose?
A
reduce an alkyne to an alkane, cis alkene, or trans alkene
2
Q
how to reduce to alkane?
A
alkyne + H2Pd/C (2 moles)
3
Q
how to reduce to a cis alkene?
A
use Lindlar’s Catalyst
Pd on CaCO3, (Pb(OAc)2), and quinoline
4
Q
why does Lindlar’s Catalyst stop at a cis alkene?
A
H2 less activated (catalyst hangs onto H more)
reacts readily with an alkyne but not an alkene
5
Q
how to reduce to a trans alkene
A
use Na/NH3 (l) sodium metal in liquid ammonia
free-radical reaction
