Pd/C-Mediated Arylation Followed by I2-Catalyzed Hydration Strategy: Preparation of Functionalized Novel Indanone Derivatives

A simple and inexpensive synthesis of novel 2-(3-oxo-3-arylpropyl)-2,3-dihydro-1H-inden-1-one derivatives has been achieved via Pd/C-mediated arylation followed by I₂-mediated regioselective hydration of 2-(prop-2-ynyl)-2,3-dihydro-1H-inden-1-ones. A wide variety of 3-aryl substituted 2-propynyl indanone derivatives were conveniently prepared by using 10% Pd/C-PPh₃-CuI as a catalyst system, some of which were used to prepare the corresponding ketones via alkyne hydration in the presence of catalytic I₂. In an in vitro study a representative compound showed inhibition of PDE4B (phosphodiesterase type 4B) and binding with this protein in silico     

An efficient approach for the synthesis of functionalized selenoethers and selenacalix[4]thiophenes, {2,5-(μ-Se)(3,4-dialkoxythiophene)}4

An efficient method for the synthesis of selenoethers and selenacalix[4]thiophene utilizing SeCl₂ is described. Reactions of phenols with SeCl₂ produce the corresponding selenoethers in moderate to good yields. The selenacalix[4]thiophenes, [–Se-3,4-(C₄(OR)₂S)]₄ (R = CH₃, C₆H₁₃) were synthesized by convenient one-pot electrophilic aromatic substitution reaction of dialkoxy thiophene with SeCl₂ in good yield.     

Time series with Birnbaum‐Saunders marginal distributions

A stationary sequence of random variables with Birnbaum‐Saunders marginal distribution is constructed using a Gaussian autoregressive moving average sequence. The parameters of the model are then estimated by the maximum likelihood method, and the resulting estimators are shown to be consistent and asymptotically normal. A simulation study is carried out to assess the performance of the estimators. The proposed model is finally used to analyze 2 real data sets.     

Design and Synthesis of Some New Benzimidazole Containing Pyrazoles and Pyrazolyl Thiazoles as Potential Antimicrobial Agents

A new class of bis heterocycles‐benzimidazolyl pyrazoles were prepared from the Michael acceptor (E)‐3‐(1H‐benzimidazol‐2‐yl)‐1‐aryl‐prop‐2‐en‐1‐one. The thiamide group was exploited to develop thiazole ring on treatment with p‐fluorophenacyl bromide to get tris heterocycles. All the lead compounds were tested for antimicrobial activity. The compound 7d having nitro substituent on the aromatic ring showed greater antimicrobial activity particularly against Pseudomonas aeruginosa and Penicillium chrysogenum.     

Developments in Titanium-Based Alkali and Alkaline Earth Metal Oxide Catalysts for Sustainable Biodiesel Production: A Review

Biodiesel represents a biodegradable, environmentally friendly, and renewable alternative to fossil fuels. Despite more than three decades of research, significant obstacles still hinder the widespread production of biodiesel. This current review elucidates both the potential and the existing challenges associated with homogeneous and heterogeneous catalysts in catalyzing biodiesel production, with a particular focus on alkali analogues, alkaline earth metal oxides, and titania-based catalysts. In particular, a comprehensive analysis is presented concerning alkali and alkaline earth-based titania (TiO₂) catalysts. Among these, the alkaline earth metal oxides, including lithium, calcium, and strontium when combined with titanium-based catalysts, exhibit superior catalytic activity compared to other metal oxides, owing to their heightened basicity. Consequently, this review offers a thorough and up-to-date insight into the potential of titania-based heterogeneous catalysts for advancing biodiesel production.     

Mechanoluminescence,electroluminescence and high-pressure photoluminescence of Mn(Ph3PO)2Br2

Mechanoluminescence, electroluminescence and high-pressure photoluminescence of Mn(Ph₃PO)₂Br₂ crystals are reported. The mechanoluminescences spectra consist of molecular and nitrogen emissions. The spectra of the molecular-emission mechanoluminescence are similar to the photoluminescence and electroluminescence spectra. On the basis of the spectroscopy of mechanoluminescence, electroluminescence and high-pressure photoluminescence, the possible mechanism of the mechanoluminescence excitation is explored.     

Properties of anisotropic superconductors containing impurities in SR model

The Josephson current for an anisotropic superconductor, described by Shiba-Rusinov model, containing paramagnetic impurities is calculated by an extension of the theory of Nagi and Upadhyayya. The slope $\text{S}{}^1$ of $\text{J}{}_{\mathrm{s}}\text{(}\text{C}\text{?}\text{, T,}\text{Ω}\text{?}\text{)}$ against temperature T near T_c is also computed and compared with the limiting isotropic case. Thermodynamic critical field $\text{H}{}_{\mathrm{c}}\text{(}\text{C}\text{?}\text{, T,}\text{Ω}\text{?}\text{)}$ for an anisotropic superconductor is also investigated.     

Hyperbranched photo responsive and liquid crystalline azo‐siloxane polymers synthesized by click chemistry

Three new types of hyperbranched photoactive liquid crystalline siloxane polymers containing azo moieties were synthesized using click chemistry methodology. The polymers were soluble in most of the polar solvents like chloroform, tetrahydrofuran, dimethylformamide, dimethyl sulphoxide and dichloromethane. The molecular weights of the polymers were in the range of 9000–12,000 g mol^?1. The trans‐cis photoisomerization of the polymer were studied both under UV radiation and dark. The isomerization rate constants were found to be in the range of 0.7–1.4 × 10^?2 sec^?1 and 7.0 × ?2.5 × 10^?5 sec^?1. The thermotropic behavior of the polymers was studied by using polarizing optical microscopy and differential scanning calorimetry, respectively. The polymers P1 and P2 showed liquid crystalline texture characteristic of nematic phase. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012