We have designed a unique strategy to obtain a zinc-salen functionalized porous polymer (Zn@SBMMP) with high zinc content (15.3 wt%) by an easy one-step, cost effective and scalable process, which shows unprecedented catalytic efficiency in the CO2 fixation reaction via cycloaddition of CO2 with epoxides. We hypothesize that a high density of Zn-Schiff base/salen units present in the porous polymer network is responsible for the exceptionally high catalytic performance of Zn@SBMMP.

CO2 fixation reaction is one of the most challenging chemical transformations not only in the context of environmental remediation but also for effective utilization of abundant carbon sources in nature. Here, we have stabilized palladium nanoparticles (NPs) at the surfaces of a hypercrosslinked porous polymer bearing carbazole and α,α′‐dibromo‐p‐xylene monomeric units to obtain a Pd@HMP‐1 nanocatalyst. The material has been thoroughly characterized by powder XRD, high‐resolution (HR)‐TEM, field‐emission (FE)‐SEM, Brunauer–Emmett–Teller (BET), thermogravimetric (TGA), and FTIR analysis. Pd@HMP‐1 showed excellent catalytic activity towards formylation of amines by carbon dioxide fixation under mild reaction conditions. The high surface area and nitrogen‐rich porous surface make the polymer a suitable support for the palladium nanoparticles and endow it with high recycling efficiency in this CO2 fixation reaction.

Ag NPs are decorated at the surface of a COF material TpPa-1 and the resulting Ag@TpPa-1 catalyzes efficiently for the synthesis of tetramic acids from a variety of propargylic amines using CO2 as reagent.

No abstract

No abstract

No abstract

No abstract

The synthesis of important organic chemicals through sustainable and green methods is always demanding for the scientific community. Fixation of carbon dioxide for this purpose is very attractive as CO2 is non‐toxic, easily available, naturally abundant, recyclable, non‐flammable and an inexpensive C1 resource, and also the concentration of CO2 (most responsible greenhouse gas) is reduced. This article demonstrates the synthesis of silver nanoparticles (AgNPs) by an eco‐friendly method and incorporation of the particles into a covalent organic framework in order to obtain a sustainable heterogeneous catalyst, AgN@COF. The catalyst has been characterized in detail by FT‐IR,UV‐Vis. spectroscopy, FE‐SEM, TEM, EDAX, XPS, PXRD, ICP‐AES, TG‐DTA and N2 absorption‐desorption studies. The synthesized catalyst is able to fix CO2 to terminal propargylic amine and propargylic alcohol for the production of 2‐oxazolidinones and α‐alkylidene cyclic carbonates, respectively, through two different catalytic pathways. In both catalytic protocols, one atmospheric carbon dioxide was used. Production of α‐alkylidene cyclic carbonates occurred at room temperature and solvent‐free condition, and 2‐oxazolidinones were obtained under mild reaction conditions. Moreover, the catalyst is recyclable and reusable. Its catalytic efficacy was preserved even after the use of six consecutive catalytic cycles.