反应详情

温度

60 °C

To a suspension of the compound of example 56 (7.12 g, 38.9 mmoles) in water (150 ml) at 60° C. was added sodium dithionite (46.7 mmol, 8.12 g). Additional sodium dithionite was added till the pink colour completely disappeared and a yellow solution was formed. The solution was stirred at 60° C. for another 4 hours. Water was evaporated and the resulting residue was precipitated from a small amount of water, providing the title compound as a yellow powder (4.02 g, yield 61%). Spectral data are identical with literature data (W. Pfleiderer et al. cited supra).

1. customa yellow solution was formed
2. customWater was evaporated
3. customthe resulting residue was precipitated from a small amount of water