Among different heterocyclic compounds, isoxazole and their analogues are very important classes of heterocyclic compounds as they display an extensive range of biological actions. This makes such scaffolds very important structures in the field of medicinal chemistry. From an extensive literature assessment, isoxazole is clinically proven to be very effective as an anti‐bacterial, anti‐fungal, anti‐inflammatory, anti‐cancer, anti‐tubercular, and anti‐neoplastic agent. The different derivatives of isoxazole which exhibits adjustment in their structure have shown a high degree of variety in their medicinal properties which makes evident them as very beneficial in the progress of novel bioactive drugs which show enhanced effectiveness along with minor harmfulness. Structural aspects of isoxazole having aromaticity with weaker nitrogen‐oxygen bonding provide a potential site for the ring cleavage. Thus, this isoxazole ring system allows easier modifications of substituents in their ring structure which consequently make isoxazole very useful intermediates in various synthetic routes of bioactive compounds. Hence, the synthesis and evaluation of isoxazole‐containing molecules with wider therapeutic consequences are always the topic of interest for chemists. Hence, in light of this comprehensive research on isoxazole, it is thought worthwhile to review various pathways for the synthesis of isoxazole analogues and having a broad spectrum of bioactive actions.

Terpolymer resins (2,4-DHBPOF) were synthesized by the condensation of 2,4-dihydroxybenzophenone and oxamide with formaldehyde in the presence of acid catalyst and using varied molar ratios of reacting monomers. Terpolymer resins composition has been determined on the basis of elemental analysis and the number average molecular weight of these resins was determined by conductometric titration in nonaqueous medium. Viscometric measurements in N,N-dimethyl formamide have been carried out with view to ascertain the characteristic functions and constants.UV-visible, IR and NMR spectra were studied to elucidate the structure. The ion-exchange study of the prepared resin was checked by batch equilibrium method with selected metal ions, Cu

A copolymer (2,4-DHBPOF) synthesized by the condensation of 2,4-dihydroxybenzophenone and oxamide with formaldehyde in the presence of acid catalyst with varying the molar proportions of the reacting monomer. Composition of the copolymer has been determined by elemental analysis. The copolymer has been characterized by UV-visible, FTIR, and 1 H NMR spectroscopy. The morphology of synthesized copolymer was studied by scanning electron microscopy (SEM). The activation energy (E a ) and thermal stability calculated by using Sharp-Wentworth, Freeman-Carroll, and Freidman's method. Thermogravimetric analysis (TGA) data were analyzed to estimate the characteristic thermal parameters. Freeman-Carroll and Sharp Wentworth methods have been used to calculate activation energy and thermal stability. The activation energy (E a ) calculated by using the Sharp-Wentworth has been found to be in good agreement with that calculated by Freeman-Carroll method. Thermodynamic parameters such as free energy change (DF), entropy change (DS), apparent entropy change (S*), and frequency factor (Z) have also been evaluated based on the data of Freeman-Carroll method.

A copolymer (2,4-DHBAMF) synthesized by the condensation of 2,4-dihydroxybenzoic acid and melamine with formaldehyde in the presence of acid catalyst using varied molar proportions of the reactants. A composition of the copolymer has been determined by elemental analysis. The number average molecular weight has been determined by conductometric titration in non-aqueous medium. The copolymer has been characterized by UV-Visible, IR and1H NMR spectral analysis. Thermogravimetric analysis was carried out to study the decomposition and various kinetic parameters. Freeman Carroll and Sharp Wentworth methods have been applied for the calculation of kinetic parameters while the data from Freeman Carroll method have been used to determine various thermodynamic parameters such as order of reaction, energy of activation, frequency factor, entropy change, free energy change and apparent entropy change. The results indicate that given copolymer have potential as matrix resin for long term applications at temperature up to 350°C.

Terpolymer resin 4-ASAUF was synthesized by the condensation of 4-aminosalicylic acid (4-ASA) and urea (U) with formaldehyde (F) in the presence of 2 N hydrochloric acid. The structure of the resin was characterized by various spectral techniques like infrared (FTIR) and nuclear magnetic resonance (1H and 13C-NMR) spectroscopy. The empirical formula and empirical weight of the resin were determined by elemental analysis. The physiochemical properties of terpolymer resin were determined. The morphological feature of the 4-ASAUF terpolymer resin was studied by scanning electron microscopy (SEM). The chelating ion-exchange property of this copolymer was studied for eight metal ions, namely, Fe3+, Cu2+, Ni2+, Co2+, Hg2+, Zn2+, Cd2+, and Pb2+ ions by using batch equilibrium method. The chelating ion-exchange study was carried out over a wide pH range at different time intervals using different electrolyte of various ionic strengths.