1919
DOI: 10.1002/cber.19190520128
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Rudolf Nietzki

Abstract: hbteilung A (Yereinsnachrichten) -11. Januar RU I) 0 L F NIEYZKI, R u d o l f N i e l z k i wurde dm 9. MIrz 1847 zu H e i l s b e r g in Ostpreufien, wo K o p e r n i k u s mehrere Jahre gelebt hat, geboren, und wo sein Vater Rektor und Prediger war.Pastor N i e t z k i war eia-hocbgebildeter Mann mit vielseitigen Kenntnissen und Interessen, so war er z. B. ein guter Botaniker, und von ibm hat sein Sobn die Freude an der scientia amabilis geerbt, SO daB er scton in jungen Jahren seine beimiscbe Flora gut kann… Show more

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Cited by 3 publications
(8 citation statements)
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“…106 Note that the enthalpy of activation ΔH° ‡ calculated in the present work includes zero-point vibration but no hydrogen tunneling effects or corrections for multiple crossing of the dividing surface at the col. 117 Nevertheless, the logarithm of the pre-exponential Arrhenius factor A, as determined by CTST according to eq 2, is equal to 12.1 and 12.3 in the gas phase and in H 2 O, respectively, according to the data shown in Table 6. These values can be compared with those of log(A/s −1 ) = 11.62 ± 0.14, 11.94 ± 0.17, and 12.05 ± 0.25 measured by Rumpel and Limbach for k HH , k HD , and k DD , respectively, in the automerization of azophenine (19) in C 2 D 2 Cl 4 . 106 The similarity of the values is consistent with the hypothesis that BTA-H 2 (2) and azophenine (19) have a common mechanism for thermally induced automerization, consisting of a sequential proton transfer leading to a zwitterionic intermediate via a transition state with a polarity similar to that of the reactant.…”
Section: ■ Introductionmentioning
confidence: 82%
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“…106 Note that the enthalpy of activation ΔH° ‡ calculated in the present work includes zero-point vibration but no hydrogen tunneling effects or corrections for multiple crossing of the dividing surface at the col. 117 Nevertheless, the logarithm of the pre-exponential Arrhenius factor A, as determined by CTST according to eq 2, is equal to 12.1 and 12.3 in the gas phase and in H 2 O, respectively, according to the data shown in Table 6. These values can be compared with those of log(A/s −1 ) = 11.62 ± 0.14, 11.94 ± 0.17, and 12.05 ± 0.25 measured by Rumpel and Limbach for k HH , k HD , and k DD , respectively, in the automerization of azophenine (19) in C 2 D 2 Cl 4 . 106 The similarity of the values is consistent with the hypothesis that BTA-H 2 (2) and azophenine (19) have a common mechanism for thermally induced automerization, consisting of a sequential proton transfer leading to a zwitterionic intermediate via a transition state with a polarity similar to that of the reactant.…”
Section: ■ Introductionmentioning
confidence: 82%
“…However, compound 19 forms no intermolecular hydrogen bonds in either known polymorph, so solid-state automerization can occur without disrupting a network of strong directional interactions. In solution, the rate of automerization of azophenine (19) and its entropy of activation were found to be essentially independent of the polarity of the solvent, and E a was determined to be 11.4 kcal mol −1 in 1,2-dichloroethaned 4 . 106 The observed rates and kinetic isotope effects ruled out automerization by a concerted shift of two atoms of hydrogen but were considered to be consistent with sequential alternatives involving the formation of an intermediate, either a weakly solvated zwitterion or a singlet diradical.…”
Section: ■ Introductionmentioning
confidence: 85%
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“…He received his Ph.D. in 1874 under August W. von Hofmann (1818 -1892) in Gçttingen.Unfortunately, Nietzkis promotion to Honorar (Adjunct) Professor of Chemistry in Basel left him little possibility to remain at the Bernoullianum, because Piccard was the official Ordinarius Professor. Therefore, Nietzki privately funded a laboratory on the third floor of the Eisfabrik on the opposite bank of the Rhine in Klein Basel and directed the laboratory instruction for organic chemistry for eleven years[1] [44] …”
mentioning
confidence: 99%