Two porous organic polymers (POPs), namely, ANT and NAP based on N,N,N′,N′-tetrakis(4-acetylphenyl)anthracene-9,10-diamine and N,N,N′,N′-tetrakis(4acetylphenyl)naphthalene-1,4-diamine, respectively, as core scaffolds and enone functionalities as the connecting backbones, were synthesized using an aldol condensation reaction. The enone backbones of the POPs mimic α,β-unsaturated ketone functionalities of dibenzylideneacetone (dba), which is frequently employed to stabilize Pd(0), e.g., Pd 2 (dba) 3 , for effective utilization in the catalysis of a myriad of organic transformations. We have thus leveraged the chalcone motifs inherent to ANT and NAP for stabilization of Pd(0) or Cu(0) nanoparticles (NPs) to provide access to POPs embedded with Pd(0) and Cu(0) nanoparticles, i.e., Pd@ANT, Pd@NAP, Cu@ANT, and Cu@NAP. Pd@POPs are shown to be applicable to facile synthesis of therapeutically useful N-arenesulfonylindoles and 2-arylbenzofurans by tandem Songashira coupling−cyclization reactions in a recyclable manner without any perceptible loss of their catalytic efficiency for up to 15 catalytic cycles. In a similar manner, Cu@POPs are shown to serve for expedient synthesis of (i) 1-aryl-1H-indazoles by tandem imine formation− Ullmann coupling, and (ii) unsymmetrical diaryl selenides by tandem activation of diphenyl diselenide−coupling with arylboronic acids in a recyclable fashion for up to eight catalytic cycles. The results thus attest to the fact that mechanisms that allow stabilization of nanoparticles can be built into the design of building blocks to develop, in a bottom-up fashion, robust POPs as supports, which obviate leaching issues and permit recyclability by precluding any loss in the catalytic efficacy of the catalysts. Furthermore, it is shown that POPs exhibit selective adsorption of clean and green fuel, namely, hydrogen gas over nitrogen, with a very high selectivity factor.

COVID-19 serosurvey provides a better estimation of people who have developed antibody against the infection. But limited information on such serosurveys in rural areas poses many hurdles to understand the epidemiology of the virus and to implement proper control strategies. This study was carried out in the rural catchment area of Model Rural Health Research Unit in Odisha, India during March–April 2021, the initial phase of COVID vaccination. A total of 60 village clusters from four study blocks were identified using probability proportionate to size sampling. From each cluster, 60 households and one eligible participant from each household (60 per cluster) were selected for the collection of blood sample and socio-demographic data. The presence of SARS-CoV-2 antibody was tested using the Elecsys Anti-SARS-CoV-2 immunoassay. The overall seroprevalence after adjusting for test performance was 54.21% with an infection to case ratio of 96.89 along with 4.25% partial and 6.79% full immunisation coverage. Highest seroprevalence was observed in the age group of 19–44 years and females had both higher seroprevalence as well as vaccine coverage. People of other backward caste also had higher seropositivity than other caste categories. The study emphasises on continuing surveillance for COVID-19 cases and prioritizing COVID-19 vaccination for susceptible groups for better disease management.