Spectrophotometric Determination of Niobium(V) as a Mixed Ligand Complex of Protocatechuic Acid & 1,2-Diaminocyclohexanetetraacetic Acid

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ADDITIVE AND DIVISIVE CLUSTER ALGORITHM FOR COST REDUCTION IN UNIT COMMITMENT

ABSTRACT This paper presents a novel technique to solve the problem of uni

Ultrasound-Promoted Synthesis of Biologically Active α-Hydroxyphosphonates/ Hydroxyphosphinates Using 1,4-Dimethylpiperazine as a Catalyst

<div><p> </p><p>A series of new α-hydroxyphosphonates/phosphinates was prepared using 1,4-dimethylpiperazine as a base catalyst under conventional as well as ultrasonic irradiation conditions by the reaction of 5-bromoindole-3-carboxaldehyde/2-nitrocinnamaldehyde with various phosphonates/phosphinates. The high yields of α-hydroxyphosphonates/hydroxyphosphinates were obtained in less reaction time under the ultrasonic irradiation method as compared with the conventional method. The synthesized compounds were screened for their in vitro and in vivo antioxidant activities, and the bio-screening data revealed that all the tested compounds exhibited good antioxidant activities. The bio-screening data revealed that compound <b>8e</b> exhibited potent antioxidant activity in both in vitro and in vivo studies while the other compounds exhibited good antioxidant activity.</p><p>[Supplementary materials are available for this article. Go to the publisher's online edition of <i>Phosphorus, Sulfur, and Silicon and the Related Elements</i> for the following free supplemental files: Additional text, tables and figures.]</p></div

Bifunctional organocatalysts for the synthesis of jasminaldehyde and their derivatives

950-955L-Proline in the presence of benzoic acid is found to be an effective catalytic system for the cross-aldol condensation of benzaldehyde with 1-heptanal under solvent free condition amongst the several amino acids screened for this reaction. Under the optimized reaction conditions, the desired product (e.g. jasminaldehyde) is formed up to 96% selectivity in one hour using the desired arylaldehyde: 1-alkanaldehyde ratio as low as 2:1 under controlled addition of 1-alkanaldehyde