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We investigated pH transformed ZnO NPs viz ZnO nanobullets and ZnO nanograins at pH 11 and 12 respectively, synthesized by co‐precipitation method. The structural, morphological, chemical, compositional and optical properties of synthesized ZnO NPs were analysed by using X‐ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray Spectroscopy (EDAX) and Ultra‐Violate Visible spectroscopy (UV‐Vis). The Noteworthy feature of ZnO NPs in presence of NaPTS leads a speedy formation of flavanones from the reaction of an aldehyde and o‐hydroxy acetophenone. Thus, it imparted the first room‐temperature brisk synthesis of flavanones in an aqueous medium.

A new series of thiophene anchored 1,3,4-thiadiazole, 1,2,4-triazole, 2-heteryl chromone, 1,5-benzothiazepine, pyrazoline, 2-styryl chromone derivatives containing fluorine are synthesized, characterized by spectral methods and screened them for various biological activities.

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We report the synthesis of NiO and Fe doped NiO nanoparticles by simple and cost effective Calotropis procera leaf extract assisted green co‐precipitation method. The leaf extract of Calotropis procera acts as reducing as well as capping agent for the synthesis of NiO and Fe doped NiO. The presence of –OH and aldehydic group (‐CHO) on synthesized nanoparticle imparts their strong interaction with synthesized nanoparticles, conveying efficient catalyst for heterocycle synthesis. The proficient catalytic application of biogenic NiO and Fe doped NiO NPs were explored in aqueous hydrotropic solution for syntheses of diaryl pyrimidinones at room temperature. The synthesized catalysts are efficient in terms of yield, reaction time and reusability. The NiO or Fe doped NiO/NaPTS/27°C is efficient, highly sustainable catalytic system for heterocycle synthesis at room temperature. Accordingly, Fe doped NiO/NaPTS proved to be a better catalytic system than NiO/NaPTS in water.

A new efficient and convenient approach towards the synthesis of pyrazole is described. The α,β-unsaturated cyanoesters were obtained from substituted benzaldehyde and ethyl cyanoacetate by reported methods. 1,5-Disubstituted pyrazoles were synthesized from α,β-unsaturated cyanoester and phenyl hydrazine using sodium ethoxide as a base in the presence of 10 mol % Cu(I) catalyst in high yields within 75-90 min under ultrasound irradiation at 60 ºC. The reaction rate is enhanced tremendously under ultrasound irradiation as compare to conventional methods with improved yields are recorded.

A Facile Synthesis of New 6-Acetamido-3-aroyl-2-styryl Chromones. -The title compounds (V) are prepared to study the effect of acetamido and styryl moieties on the biological activity. -(BONDGE, S. P.; MAHALLE, S. R.; BURUNGALE, A. S.; PATIL, L. R.; MANE*, R. A.; Indian J.