Alkyne Reaction Mechanisms - Organic Chemistry

TRANSFORMING AlkyNES
NEED A GOOD MELLEOHME,

STRONG
BASES ARE MOLECULES THA
CREATE An
AlkyC Now from Bre-
+
conj
Acid
REALLY WANT THAT AddMIONAL
PROTON
.
AN ALKENE WH Strang The
DeProTorre : - Vane Or RCEC-ARE Both
good
ArgHER PKars BETTER .




AlkyNE IS Now
ASTRONG MeleopHE .




WANT AN ALKENE OR
ALIANE
Buy Have Hz
D REE Of Reduction
An
AlkynE ? Limolar's
Eg
REDUCE THAT
AlkyNE WITH:
Da CATALYST

A
VARIES
ON
DEPENDING
REACTray
of
attryere
Hydrog
ENTON :
METAL CATALYST
.


Very Smar Hydrogenation
To Hz LESS ACTIVE = LESS
>
of ALKENES pd Reduction
.
Da .




d




ELECTROPHMIC AddNON W/ALkyNES

↓
of
2 Molecules
Hydrogen
Br
H-Br ...
H
Requires
Hydrag -
>
.
-



H-Br
EN HALiDE Da
S
>
Da HALidE for .
REACTION
Da ..............
ADDDION : A
Br CREATES A HALOALIENE from
An
AlkynE



HHz GMES And Ever from an Alkyne
Acid CALyZED -1 - OH

Acid And .
WHER
En

-my
-




Da
-




i Da Da

BE FURTHER TRANSFORMED
HydRATON :
H20
1
CAN
into A KETONE
Da
Ot




OxymerCuration/ GNES A MURCORIC NTERMEONATE
- Hg(OAc)2
REDUCTION : Da Hg(Ad 2

Hz0 HySOu
,
-
-"glacan
2 Da
S




Off
WHICH CAN THEN BE USED TO MAKE
A KETONE
.




-
GIVES A BORANE INTERMEDATE
Hydroboration
BHz
THAT CAN BE USED TO MAKE AN
odaron : Da
Da ALdEltydE
BHz