| Green chemistry has a significant social, environmental and economic benefits,which avoids the chemical side effects, to show people’s initiative, it is environmentalprotection consciousness to a high level. At the same time also embodies the chemistryscience, technology and society of mutual connection and interaction, chemical sciencedevelopment and society to the development of Chemical Sciences and the role ofproduct, the chemical itself is the arrival of a new level. But also the traditionalchemical and engineering practice, the traditional chemistry green chemistry is thechemistry to shift from extensive model to intensive model change. With water andsafety aids or water as green solvent is the important research content of greenchemistry, and has wide industrial application prospect. This paper aims to explore thewater/polyethylene glycol and water system, amino sulphonamide ligands on aldehydehydrogenation catalytic performance. This thesis includes four parts:1. This paper summarizes the definition and research content of green chemistry andgreen solvent, the concept and research content of water as a reaction solvent, andthe advantages of water as a solvent and deficiencies. In recent decades aldehydesby catalytic reduction reaction of transition metal compounds, including aldehydescatalyzed by the catalytic hydrogenation reaction, and transition metal compoundsof aldehydes catalyzed by catalytic hydrogen transfer reaction. In the above catalyticreduction reaction, is mainly based on the ethylenediamine-based ligands, and thiskind of ligands in certain conditions of aldehydes catalyzed transfer hydrogenationcatalytic activity to do a simple introduction, but also on the individual catalystrecovery and recycling are discussed.2. The transfer hydrogenation of aldehydes catalyzed by Ru-TsEN in a mixture of PEGand water as studied. The high activity and enantioselectivity were obained, whichare better than or comparable to those obtained in conventional orgainc solvent orwater. Through the best mixed extraction system n-hexane/ether (V/V) extracts.The results show that, without modification of the Ru-TsEN catalyst can be recycled9times, its activity is not obviously decreased in6times previous recycled reation.Among them, in the α,β-unsaturated aldehyde by catalytic hydrogenation ofcinnam-aldehyde, only a small amount of carbon carbon double bond and a carbonylbond were reduced, while the carbon carbon double bond and a carbonyl bond wereaccounted for2%of the total reduction. So the PEG aqueous can serve as a new‘suppport’for the immobilization of Ru-TsEN catalyst without calling for any modification.3. Based on the TsEN ligand structure modification, successful synthesis of a newquaternary ammonium salt containing water soluble amino amide ligands I-V,and [RuCl2(p-cymene)]2complex, by sodium formate as hydrogen source forhydrogen transfer reaction of aldehyde by catalytic performance. Achieved goodcatalytic effect of catalysts and reaction, easy separation of mixture, and can bereused for5times. The experimental results show that, for different types ofaromatic aldehydes and α, β-unsaturated aldehyde in the hydrogen transfer reactionreaction, the reaction time is almost completed in4hours. Benzaldehyde Catalyzedby hydrogen transfer reaction1h reaction; In α, β-unsaturated aldehyde by catalytichydrogenation of cinnamaldehyde, only a small amount of carbon carbon doublebond and a carbonyl bond were reduced, while the carbon carbon double bond and acarbonyl bond were reduced accounted for the total reduction of1.8%.4. Synthesis of a novel based on the ethylenediamine-based ligands carboxyl groupcontaining water soluble amino amide ligands VI, with water as solvent, sodiumformate as hydrogen source, inspected the ligand and [RuCl2(p-cymene)]2complexes of aldehydes, aldehydes and hydrogen transfer reactions catalyticperformance. Achieved good catalytic effect of catalysts and reaction, easyseparation of mixture, and can be reused for3times. The experimental results showthat, for different types of aromatic aldehydes and α, β-unsaturated aldehyde transferhydrogenation reaction, reaction time is almost completed in4.5hours. Catalytichydrogen transfer reaction of benzaldehyde obtained better catalytic effect; in α,β-unsaturated aldehyde by catalytic hydrogenation of carbonyl bond, are beingrestored, and unsaturated carbon carbon double bond and a carbonyl reduction wereaccounted for2.3%of total. |
