反应详情

Sodium amide (39 g) was dispersed in dry tetrahydrofuran (800 mls). Methyltriphenylphosphonium bromide (102 g) was added and the mixture stirred at R.T. for 2 hours. 3-allyloxy-4-methoxy-benzaldehyde (50 g) was then added dropwise over ca. 15 mins. and the mixture stirred for a further 3 hours. The mixture was filtered and the solvent removed from the filtrate under reduced pressure. The residue was washed with diethyl ether (1.51) and the solvent removed to yield a brown coloured resin. The washing process was repeated and the residue obtained was distilled under reduced pressure to give 3-allyloxy-4-methoxystyrene (29.5 g), b.p. 98°-104° C. at 0.8 mbar.

1. stirringand the mixture stirred for a further 3 hours
2. filtrationThe mixture was filtered
3. customthe solvent removed from the filtrate under reduced pressure
4. washThe residue was washed with diethyl ether (1.51)
5. customthe solvent removed
6. customto yield a brown coloured resin
7. customthe residue obtained
8. distillationwas distilled under reduced pressure