How can acetylene be converted into 2-bromo-2-methyl-propane ?
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1
Answer:
This is the preparation and hydrolysis of a Grignard reagent.
Explanation:
Part (i)
This is the preparation of a Grignard reagent.
R-X
+
Mg
dry ether
−−−−→
R-MgX
Grignard Reagent
Your equation is
(
CH
3
)
3
C-Br
+
Mg
dry ether
−−−−→
(
CH
3
)
3
C-MgBr
Part (ii)
This is the hydrolysis of a Grignard reagent.
R-MgX
+
H
2
O
→
RH
+
MgX(OH)
The
R-MgX
behaves as if it were
R
−
,
+
MgX
.
The
R
−
is a strong base, so it removes a proton from the water to form
RH
.
Your equation is
(CH
3
)
3
C-MgBr
+
H
2
O
→
(CH
3
)
3
C-H
+
MgBr(OH)
Note: the
MgBr(OH)
is a gelatinous substance, so the hydrolysis is usually carried out in the presence of dilute acid to dissolve the basic salt.
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