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2 results on '"Rucha P Wani"'

1. Solvent-free one pot synthesis of 1,2-dihydroquinolines from anilines and acetone catalysed by MOF-199

Author

Vrushali Raut, Rucha R. Wani, Hemchandra K. Chaudhari, and Dipanwita Das

Subjects
Anilines, 1,2-Dihydroquinolines, Metal organic framework, MOF-199, Heterogeneous catalyst, Recyclable, Chemistry, QD1-999
Abstract

The one-pot synthesis of 2,2,4-trimethyl-1,2-dihydroquinolines by the reaction of anilines with acetone or desired ketone catalysed by MOF-199 was developed in a mild, convenient, solvent free and efficient reaction procedure. Heterogeneous catalyst, MOF-199 was highly crystalline porous metal organic framework, synthesized from the reaction between copper nitrate and 1,3,5-benzenetricarboxylic acid by solvothermal method. The MOF-199 was characterized by the various methods such as XRD, SEM, EDS and FT-IR. Under mild conditions, excellent conversions were obtained in presence of 2.5 mol% catalyst. MOF-199 catalyst can be simply separated from the reaction mixture, easily filtered and reused many times without massive catalytic degradation. There was no participation from homogeneous catalysis of active species leaching to the liquid phase indicating that MOF-199 is truly heterogeneous catalyst.

Published
2021
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2. Spatially Resolved Organomineral Interactions across a Permafrost Chronosequence

Author

Matthew H. H. Fischel, Owen W. Duckworth, Thomas A. Douglas, Donald L. Sparks, Rucha P Wani, Tyler D. Sowers, Elizabeth K. Coward, and Aaron R. Betts

Subjects
chemistry.chemical_classification, Pleistocene, Spatially resolved, Chronosequence, Yedoma, Permafrost, General Chemistry, 010501 environmental sciences, Ferric Compounds, 01 natural sciences, Carbon, Active layer, Soil, chemistry, Environmental chemistry, Soil water, Environmental Chemistry, Organic matter, Alaska, 0105 earth and related environmental sciences
Abstract

Permafrost contains a large (1700 Pg C) terrestrial pool of organic matter (OM) that is susceptible to degradation as global temperatures increase. Of particular importance is syngenetic Yedoma permafrost containing high OM content. Reactive iron phases promote stabilizing interactions between OM and soil minerals and this stabilization may be of increasing importance in permafrost as the thawed surface region ("active layer") deepens. However, there is limited understanding of Fe and other soil mineral phase associations with OM carbon (C) moieties in permafrost soils. To elucidate the elemental associations involved in organomineral complexation within permafrost systems, soil cores spanning a Pleistocene permafrost chronosequence (19,000, 27,000, and 36,000 years old) were collected from an underground tunnel near Fairbanks, Alaska. Subsamples were analyzed via scanning transmission X-ray microscopy-near edge X-ray absorption fine structure spectroscopy at the nano- to microscale. Amino acid-rich moieties decreased in abundance across the chronosequence. Strong correlations between C and Fe with discrete Fe(III) or Fe(II) regions selectively associated with specific OM moieties were observed. Additionally, Ca coassociated with C through potential cation bridging mechanisms. Results indicate Fe(III), Fe(II), and mixed valence phases associated with OM throughout diverse permafrost environments, suggesting that organomineral complexation is crucial to predict C stability as permafrost systems warm.

Published
2020

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