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Methoxy 2 acetyl naphthalene and 6 methoxy 2 propionylnaphthalene were selectively brominated by cupric bromide in methanol to give 6 methoxy 2 (2′ bromoacetyl)naphthalene and 6 methoxy 2 (2′ bromopropionyl)naphthalene in yield of 94%～97% and 2 methoxy 1 bromo naphthalene in yield of 98%, respectively.
Methoxy 2 acetyl naphthalene and 6 methoxy 2 propionylnaphthalene were selectively brominated by cupric bromide in methanol to give 6 methoxy 2 (2 ’bromoacetyl) naphthalene and 6 methoxy 2 (2’ bromopropionyl) naphthalene in yield of 94% ~ 97% and 2 methoxy 1 bromo naphthalene in yield of 98%, respectively.