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)naphthal...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.展开更多
The selective bromination of paeonol (4-methoxy-2-hydroxyacetophenone) has been studied as function of solvents(methanol, ethanol, chloroform-ethyl acetate), reaction time, temperature and the mole ratio of reagents. ...The selective bromination of paeonol (4-methoxy-2-hydroxyacetophenone) has been studied as function of solvents(methanol, ethanol, chloroform-ethyl acetate), reaction time, temperature and the mole ratio of reagents. The higher yield was obtained in polar solvents than in non-polar ones. The best solvent appeared methanol, and the mixtures of polar solvents were better than any single of them, except methanol. Paeonol and cupric bromide in mole ratio of 1∶2 in methanol under reflux temperature for five hours gave a bromination product in yield of 63.3%.展开更多
文摘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.
文摘The selective bromination of paeonol (4-methoxy-2-hydroxyacetophenone) has been studied as function of solvents(methanol, ethanol, chloroform-ethyl acetate), reaction time, temperature and the mole ratio of reagents. The higher yield was obtained in polar solvents than in non-polar ones. The best solvent appeared methanol, and the mixtures of polar solvents were better than any single of them, except methanol. Paeonol and cupric bromide in mole ratio of 1∶2 in methanol under reflux temperature for five hours gave a bromination product in yield of 63.3%.
