Abstract
Metal nanoparticles have been deeply studied in the last few decades due to their attractive physical and chemical properties, finding a wide range of applications in several fields. Among them, well-defined nano-structures can combine the main advantages of heterogeneous and homogeneous catalysts. Especially, catalyzed multi-step processes for the production of added-value chemicals represent straightforward synthetic methodologies, including tandem and sequential reactions that avoid the purification of intermediate compounds. In particular, palladium- and copper-based nanocatalysts are often applied, becoming a current strategy in the sustainable synthesis of fine chemicals. The rational tailoring of nanosized materials involving both those immobilized on solid supports and liquid phases and their applications in organic synthesis are herein reviewed.
Highlights
From a chemical and economic viewpoint, environmentally friendly protocols, in particular multi-step reactions, stand for straightforward synthetic methodologies to obtain added-value chemicals, avoiding intermediate purifications and reducing wastes [1,2,3]
Wang’s group studied the same type of reaction using anchored PdNPs on a zeolitic imidazolate framework (ZIF) and supported on graphene oxide [23]; palladium precursor was first reduced by NaBH4 using PVP as a stabilizer, and the PdNPs formed were anchored on ZIF and supported on graphene oxide
This material showed the presence of crystalline face-centered cubic Pd(0) dispersed on the support, measured by CO2-temperature-programmed desorption (CO2-TPD), enabled the catalytic reaction to work under smoother conditions (1 mol% Pd, entry 6, Table 1), obtaining similar conversion and selectivity than that observed with ZIF on graphene oxide
Summary
From a chemical and economic viewpoint, environmentally friendly protocols, in particular multi-step reactions, stand for straightforward synthetic methodologies to obtain added-value chemicals, avoiding intermediate purifications and reducing wastes [1,2,3]. Wang’s group studied the same type of reaction using anchored PdNPs on a zeolitic imidazolate framework (ZIF) and supported on graphene oxide [23]; palladium precursor was first reduced by NaBH4 using PVP (polyvinylpyrrolidone) as a stabilizer, and the PdNPs formed were anchored on ZIF and supported on graphene oxide This material showed the presence of crystalline face-centered cubic (fcc) Pd(0) dispersed on the support, measured by CO2-temperature-programmed desorption (CO2-TPD), enabled the catalytic reaction to work under smoother conditions (1 mol% Pd, entry 6, Table 1), obtaining similar conversion and selectivity than that observed with ZIF on graphene oxide. EtOH/DMF solvent mixture was crucial to tune nucleation and the growth of shell on PdNPs. The as-prepared material was employed in sequential condensation/nitro reduction catalysis, exhibiting good performance (86% selectivity, TOF 3.6 h−1) under mof i5l5d conditions (room temperature, 1 mol% Pd, 2 bar H2). PdNPs/DETA-APP is so far the most active catalyst reported in the Nanomaterials 2021T,a1b1,le1829.1ColmitperaaritsuorneoffotrhtehreepsoerqtuedencatitaallyKtinc oacetviveintyagtoelthceosnedqeunesnatitaiol cno/nsedleencstaivtieonn/intirtororreedduuccttiioonn. reaction of 55 (Table 2, entry 4)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
