- Phosphine ligand for butadiene hydroformylation reaction and preparation method thereof
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The invention discloses a bidentate phosphine ligand compound with a structure as shown in a general formula 1, a synthesis method of the bidentate phosphine ligand compound, and application of the phosphine ligand to promotion of metal catalysis of 1, 3-butadiene hydroformylation reaction.
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Paragraph 0089; 0090; 0092-0093
(2021/06/23)
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- Syntheses of anthraeenones. 1. Sodium dithionite reduction of peri-substituted anthracenediones
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The reaction of peri-substituted anthracenediones with sodium dithionite in dimethylformamide and water has been investigated. The system selectively reduces the carbonyl group flanked by the peri substituents of the anthracenediones to give the corresponding 4,5-disubstituted 9(10H)-anthracenones and thus provides a route to anthracenones which are otherwise difficult to obtain. Many functional groups can be tolerated, the reaction is compatible with the presence of peri alkoxy groups and unsaturated side chains of the starting anthracenediones, and the reduction does not go beyond the anthracenone stage. However, the formation of anthracenones depends on the nature of the peri substituents. No products were obtained from the 1,8-dimethyl-substituted anthracene-dione and the parent compound with no substituents.
- Prinz, Helge,Wiegrebe, Wolfgang,Mu?ller, Klaus
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p. 2853 - 2856
(2007/10/03)
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