For EACH of the following reactions (a)-(d) provide a curved arrow mechanism and where appropriate briefly comment on any issues of selectivity that arise. (a) (b) CHO MeO OMe (i) Ph3P=CBr2 (ii) "BuLi (2 equivs) (iii) Mel H₂SO4 (cat) CO₂Me

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For EACH of the following reactions (a)-(d) provide a curved arrow mechanism and where
appropriate briefly comment on any issues of selectivity that arise.
(a)
(b)
(c)
CHO
MeO OMe
3
OH
MeO
NH
OEt
Me
(i) Ph3P=CBr2
(ii) "BuLi (2 equivs)
(iii) Mel
+
H₂SO4 (cat)
OMe H₂O
Me3Si
*
TfO
OMe
O
MeCN
CO₂Me
MeO
CsF, NaHCO3
Me
COMe
OMe
Transcribed Image Text:For EACH of the following reactions (a)-(d) provide a curved arrow mechanism and where appropriate briefly comment on any issues of selectivity that arise. (a) (b) (c) CHO MeO OMe 3 OH MeO NH OEt Me (i) Ph3P=CBr2 (ii) "BuLi (2 equivs) (iii) Mel + H₂SO4 (cat) OMe H₂O Me3Si * TfO OMe O MeCN CO₂Me MeO CsF, NaHCO3 Me COMe OMe
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