The organometallic chemistry of lithium, magnesium and zinc is often considered to be very similar. However, the complexes can often show different reactivity and selectivity. (i) Suggest two reasons why you may choose to use an organozinc reagent rather than the analogous lithium reagent in the following reaction. H+ MX Et,0 A В OEt -78°C M = Li M = Zn, X = Br (ii) Give products A and B when M=Li A = B = (iii) Give products A and B when M = Zn (X = Br) A = B =

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Question 3
The organometallic chemistry of lithium, magnesium and zinc is often considered to be very
similar. However, the complexes can often show different reactivity and selectivity.
(i)
Suggest two reasons why you may choose to use an organozinc reagent rather than the
analogous lithium reagent in the following reaction.
H+
„MX
Et,0
A
B
OEt
-78°C
M = Li
M = Zn, X = Br
(ii)
Give products A and B when M=Li
A =
B =
(iii)
Give products A and B when M= Zn (X = Br)
A =
B =
Transcribed Image Text:Question 3 The organometallic chemistry of lithium, magnesium and zinc is often considered to be very similar. However, the complexes can often show different reactivity and selectivity. (i) Suggest two reasons why you may choose to use an organozinc reagent rather than the analogous lithium reagent in the following reaction. H+ „MX Et,0 A B OEt -78°C M = Li M = Zn, X = Br (ii) Give products A and B when M=Li A = B = (iii) Give products A and B when M= Zn (X = Br) A = B =
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