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- W2022077116 abstract "Abstract The kinetics of solvent‐free reactions can be followed in situ by 13 C nuclear magnetic resonance (NMR) spectroscopy, provided that the reaction mixture can be maintained liquid at the monitoring temperature. The pros and cons of the technique and the correct translation of the signal intensities into concentrations are discussed. A good model for this investigation is the reaction of ethylene carbonate ( 1 ) with aniline ( 2 ) at 140°C, two alkylation products of N ‐mono‐ and N , N ‐bis‐(2‐hydroxy)ethylation of aniline form (compounds 3 and 4 , respectively). The overall reaction occurs with heavy volume shrinking, so that the physical as well as the chemical features evolve during the course of the process. The chemical evolution is described by the kinetic constants k 1 and k 2 of the two N ‐alkylation steps, the physical evolution by the time‐dependent activity coefficients α( t ). Two complementary procedures are utilized for the determination of these parameters. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 154–160, 2011" @default.
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- W2022077116 date "2011-01-21" @default.
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- W2022077116 title "Kinetic parameter estimation of solvent-free reactions monitored by <sup>13</sup> C NMR spectroscopy, a case study: Mono- and di-(hydroxy)ethylation of aniline with ethylene carbonate" @default.
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- W2022077116 doi "https://doi.org/10.1002/kin.20532" @default.
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