IR@NEIST - North East Institute of Science and Technology (CSIR)
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Dicarbonylrhodium(I) complexes of pyridine alcohol ligands and their catalytic carbonylation reaction
Get PDFReaction of dimeric complex [Rh(CO)2Cl]2 with two molar equivalent of pyridine alcohol ligands (L) like
2-hydroxymethylpyridine (a), 3-hydroxymethylpyridine (b) and 4-hydroxymethylpyridine (c) afford the
rhodium(I) dicarbonyl complexes [Rh(CO)2ClL](1a–c). The ligands are coordinated to the metal center
through N-donor site. The complexes 1 undergo oxidative addition (OA) reactions with various alkyl
halides (RI) like CH3I, C2H5I to produce Rh(III)complexes of the type [Rh(CO)(COR)IClL], where R = –CH3(2),
–C2H5(3). Kinetic data for the reaction of 1 with CH3I indicate a first order reaction. The catalytic activity
of the complexes 1 in the carbonylation of methanol was higher than that of the well known species
[Rh(CO)2I2]−
Seri-biodervisity conservation of muga silk worm, Antheraea assama food plants and its role in silk protein bio-synthesis, In-Proc.
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Thermodynamic interpretation of adsorption of some benzenetricarboxylic and dihydroxybenzoic acids at the ?-alumina/electrolyte interface
Get PDFStudy on the reactive extraction and stripping kinetics of certain �-lactam antibiotics
Get PDFThe extraction equilibrium and stripping of certain �-lactam antibiotics such as 7-aminocephalosporanic acid (7-ACA), 7-aminodeacetoxy
cephalosporanic acid (7-ADCA), 6-aminopenicillanic acid (6-APA), cephalosporin-C (CPC) and cephalexin from aqueous solution of phosphate
and carbonate buffers were studied with Aliquat-336 (tricaprylylmethylammonium chloride) dissolved in n-butylacetate as the solvent over an
aqueous phase pH range of 5–10. The extraction equilibrium constant Kp was found to increase with aqueous phase pH, which is attributed to the
increase in ionisation of the �-lactam. A systematic study on kinetic of stripping or re-extraction of 7-ADCA and cephalexin from the extracted
phase was carried out using an aqueous solution of citrate buffer at different pH values and was found to be pH dependent which is also attributable
to ionisation behaviour of the �-lactams. Such observation is considered important, as re-extraction at an appropriate pH value is possible. The rate
of stripping was found to be weakly dependent on Cl− concentration of the aqueous phase and the same was analysed with a simple mass transfer
model based on film theory
Indium(III) trifluoromethanesulfonate: An efficient reusable catalyst for the alkynylation-cyclization of 2-aminoaryl ketones and synthesis of 2,4-disubstituted quinolines
Get PDFAn environmentally friendly and highly efficient procedure
for the preparation of 2,4-disubstituted quinoline derivatives
has been developed by a simple alkynylation 13cyclization reaction
of 2-aminoaryl ketones with phenylacetylenes in the presence of indium(
III) trifluoromethanesulfonate In(OTf)3 under microwave irradiation
and solvent-free conditions. This catalyst can be recovered
after the reaction and reused efficiently in subsequent runs
Propensity of citric, maleic, oxalic and succnic acids for the acquous solution- vapour interface : Surface tension measurment and molecular dynamics simulations
Get PDFBehaviour of oxalic, citric, succinic, and maleic acids at the air/water interface is characterized and quantified
by surface tension measurements in a broad concentration range and molecular dynamics simulations
in slab geometry employing a polarizable force field. The relative order of surface propensities of
these atmospherically relevant acids is established in this study with results being also in a very good
agreement with previous measurements
