Reduction of aromatic aldehydes into alcohols by novel designed eco-friendly heterogenous catalysts

We utilize frequently the alcohols in our daily lives as well as chemistry. Therefore, scientists have resorted to ecofriendly methods using non-toxic solvents, reusable and recoverable catalysts for synthesis of alcohols. In this study, transfer hydrogenation method was used in the reduction to primary alcohols of aldehydes. Thanks to this method, hydrogen generation was easily controlled during the reaction. In our study, we have described a new method for the transfer hydrogenation of various aromatic aldehyde compounds with Pt(0)/TPA@rGO NPs introduced by our group for the first time. Dimethylamine borane (DMAB) as eco-friendly hydrogen source contributed to reduction reaction in a mild condition and in a very small amount of solvent (1.5 ml of water/methanol). The processes were achieved in the presence of Pt(0)/TPA@rGO NPs in eco-friendly solvent system with one of the highest yield and shortest time. Another important materials of Organic Chemistry is halogenated organic compounds which are very important for natural or synthetic organic compounds. However, they can cause serious environmental pollution. For this purpose, recently, scientists developed novel methods and catalysts for dehalogenation of halogenated compounds due to the increasing concerns of environmental pollution. In present work, we have reported that catalytic hydrodehalogenation of various arylhalides was successfully accomplished in the presence of RuPd@GO NPs without using H2 gas under ultrasonic conditions. Herein, dehydrogenation of ammonia borane (AB) in methanol (1 ml) followed by dehalogenation of haloaromatics /haloheteroaromatics in the presence of RuPd@GO NPs were carried out at room temperature within mostly 2 h. The comparison of substrates about catalytic activity were also examined. This process is economic and efficient and it can be assessed as an eco-friendly method with both reusable catalyst, hydrogen source.