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Catalyst-free ultrasound assisted novel one pot pseudo five component synthesis of aryl-bis-[1H-pyrazol-5-ol-4-yl]methanes,het(aryl)-bis-[1H-pyrazol-5-ol-4-yl]methanes and their 1-phenyl derivatives in aqueous medium

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Green Synthesis and Catalysis 2022年第2期3卷 190-193页

作者： Sudha S Mohamed afzal pasha Department of Chemistry and Biochemistry Jyoti Nivas College AutonomousBengaluru 560095India Department of Studies in Chemistry Jnanabharathi CampusBangalore UniversityBengaluru 560056India

An efficient,catalyst-free and eco-friendly ultrasound-assisted novel one-pot pseudo-five-component synthesis of aryl-bis-[1H-pyrazol-5-ol-4yl]methanes,het(aryl)-bis-[1H-pyrazol-5-ol-4yl]methanes and their 1-phenyl derivatives in water is *** products were obtained in excellent yield in shorter duration with high purity,by simple *** synthetic methodology has been optimized and discussed herein.

关键词： Bis pyrozolyl-methanes Ethyl acetoacetate Aromatic/het(aryl)aldehydes Hydrazine/phenyl hydrazine One-pot multi-component synthesis Ultrasound

硅胶硫酸:一种在温和及无溶剂条件下一锅法合成1,4-二氢吡啶的高效多相催化剂(英文)

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催化学报 2011年第7期32卷 1180-1184页

作者： Bandita DATTA M.afzal pasha Department of Studies in Chemistry Central College CampusBangalore University

A series of 1,4-dihydropyridines have been prepared by a one-pot condensation of aldehydes,ethyl acetoacetate,and ammonium acetate in the presence of a heterogeneous catalyst silica sulfuric acid at room temperature under solvent-free condition. This new protocol has the advantage of short reaction time and excellent yields,and is an environmentally benign route to the synthesis of 1,4-dihydropyridines.

关键词： aldehyde ethyl acetoacetate ammonium acetate silica sulfuric acid 1,4-dihydropyridine

Amberlite IR-120:一种可重复利用的微波辅助条件下胺类化合物与甲酸N-甲酰化反应的催化剂(英文)

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催化学报 2010年第5期31卷 518-520页

作者： Madhusudana Reddy MVTHUKUR BHOJEGOWDSHA Aatika NIZAMSHA Mohamed afzal pasha Department of Studies in Chemistry Central College CampusBangalore University

A rapid and practical green route for the N-formylation of amines with formic acid using Amberlite IR-120 as a catalyst is *** method provides an efficient and much improved modification over the reported methods in terms of yield,reaction time,and work-up procedure.A wide variety of substituents is tolerated,which is not the case for existing procedures.

关键词： N-formylation Amberlite IR-120 蚁的酸胺微波

高效、可重复使用的多相催化剂SiO_2-NaHSO_4用于水中三组分一锅法合成八氢喹唑啉-2,5-二酮(英文)

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催化学报 2012年第4期33卷 677-680页

作者： Sadeq Hamood Saleh AZZAM Aisha SIDDEKHA Aatika NIZAM Mohamed afzal pasha Department of Studies in Chemistry Central College CampusBangalore UniversityBengaluru-560001India Department of Chemistry Smt.V.H.D.Central Institute of Home ScienceBangalore-560001India

An environmentally benign method for the synthesis of octahydro-quinazolin-2,5-diones by the reaction of aromatic aldehydes,dimedone,and urea in the presence of SiO2-NaHSO4 is ***2-NaHSO4 acts as an efficient,mild,and... 详细信息

关键词：化学催化高压高温

采用燃烧技术制备CuO纳米粒子:一种高效且环境友好的用于芳族醛合成芳族腈催化剂(英文)

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催化学报 2013年第4期34卷 704-710页

作者： Belladamadu Siddappa ANANDAKUMAR Muthukur Bhojegowd Madhusudana REDDY Chikka Nagaiah THARAMANI Mohamed afzal pasha Gujjarahalli Thimmanna CHANDRAPPA Department of Chemistry Bangalore University Department of Chemistry Ruhr Universit t Bochum

CuO nanoparticles were synthesized using an energy-efficient and rapid solution combustion technique with malic acid employed as a fuel. The combustion-derived CuO nanoparticles were used as catalysts in a one-pot synthesis of aromatic nitriles from aromatic aldehydes and hydroxylamine hydrochloride. The catalyst was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, and Brunauer-Emmett-Teller surface area analysis. The catalytic activity of the CuO nanoparticles in the synthesis of aromatic nitriles from aromatic aldehydes was evaluated. The present protocol offers the advantages of a clean reaction, simple methodology, short reaction duration (1-2 min), and high yield (85%-98%). The catalytic activity of the CuO nanoparticles was found to be higher than that of bulk CuO powder under the same conditions. The catalyst can also be recovered and reused up to four times with no significant loss of catalytic activity. The present approach is inexpensive and is a convenient technique suitable for industrial production of CuO nanoparticles and nitriles.

关键词： Copper oxide Nanoparticle Solution combustion Nitrile Aldehyde Hydroxyl amine

Numerical Simulation and Experimental Verification of CMOD in SENT Specimen: Application on FCGR of Welded Tool Steel

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Acta Metallurgica Sinica(English Letters) 2013年第1期26卷 92-96页

作者： Amir SULTAN Riffat Asim pasha Mifrah ALI Muhammad Zubair KHAN Muhammad afzal KHAN Naeem Ullah DAR Masood SHAH Department of Mechanical Engineering University of Engineering and Technology International Islamic University

Single-edged notched tension （SENT） specimen is used to study the fatigue crack growth rate （FCGR） behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement （CMOD） vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,

关键词： Tool steel Weld Single-edged notched tension (SENT) CMOD Fatigue crackgrowth rate (FCGR)