bluuebunny/crossref_metadata_2025_split huggingface dataset:
N Reactivity vs. O reactivity in aqueous chlorination
Authors: Armesto X. L. , Canle L. M. , García M. V. , Losada M. , Santaballa J. A. 
Published: January 2005

AbstractNitrogenated compounds react with hypochlorous acid yielding N‐chloro compounds. In principle, α‐amino acids chlorination may take place on the oxygen of the carboxylic group or on the nitrogen of the amino group. In this framework, we discuss the different reactivities of nitrogen and oxygen towards chlorine, and come to the conclusion that the nitrogen is the preferred reaction site in α‐amino acids chlorination. © 1994 John Wiley & Sons, Inc.
Kinetics and mechanism for the atmospheric oxidation of 1,1,2‐trifluoroethane (HFC 143)
Authors: Barry John , Sidebottom Howard , Treacy Jack , Franklin James 
Published: January 2005

AbstractThe rate constant for the reaction of the hydroxyl radical with 1,2,2‐trifuoroethane has been determined over the temperature range 278–323 K using a relative rate technique. The results provide a value of k(OH + CH2FCHF2) = 2.65 × 10−12 exp(−1542 ± 500/T) cm3 molecule−1 s−1 based on k(OH + CH3CCl3) = 1.2 × 10−12 exp(−1400 ± 200/T) cm3 molecule−1 s−1 for the rate constant of the reference reaction. The chlorine atom initiated photooxidation of CH2CHF2 was investigated from 255 to 330 K and as a function of O2 pressure at 1 atmosphere total pressure using Fourier transform infrared spectroscopy. The major carbon‐containing products were CHFO and CF2O suggesting that the alkoxy radicals CH2FCF2O and CHF2CHFO, formed in the reaction, react predominantly by carbon‐carbon bond cleavage. The results indicate that formation of CHF2CFO from the reaction of CHF2CHFO radicals with O2 will be unimportant under all atmospheric conditions. © 1995 John Wiley & Sons, Inc.
Formation and decay of N, N, N′, N′‐tetraethyl‐p‐phenylenediamine radical cation in aqueous solution. A kinetic study by stopped‐flow technique
Authors: Aravindan Ponnu , Maruthamuthu Pichai , Dharmalingam Periyasamy 
Published: January 2005

AbstractA kinetic study has been carried out on the oxidation of N, N, N′, N′,‐tetraethyl‐p‐phenylenediamine (TEPD) by metal ion like Ce4+, oxoanions viz., MnO4− and Cr2O72−; peroxides such as peroxomonosulphate (PMS), peroxodisulphate (PDS), and H2O2; and halogens namely Cl2, Br2, and I2. The fast kinetics of the formation and decay of the radical cation TEPD˙+ have been analyzed at 565 nm by the stopped‐flow technique under pseudo‐first‐order conditions. From the kinetic data, it has been inferred that the reactions were found to be of first‐order with respect to [TEPD] and [oxidant] but over all it has been of second‐order. The observed second‐order rate constants in both the formation and decay of TEPD˙+ has been correlated with the oxidation potentials of the various oxidants employed in this study. The effect of pH on the oxidation has been investigated in the formation and decay of TEPD˙+ as well as reduction studies have also been carried out using dithionite which has been found to regenerate the TEPD from the TEPD˙+ and the corresponding rate constant has also been determined. Besides these, this article also explains how the TEPD, which forms TEPD˙+ acts as a better electron relay than TMPD(N, N, N′, N′‐tetramethyl‐p‐phenylenediamine) which forms TMPD˙+, even though both of them undergo one‐electron oxidation and are used in the chemical routes to solar energy conversions. The observed rate constants for electron transfer were correlated theoretically using Marcus theory. The observed and calculated rate constants have good correlation. © 1995 John Wiley & Sons, Inc.
Ozone reactions with aliphatic ethers in CCl4. Kinetics and mechanism
Authors: Rakovsky S. K. , Cherneva D. R. , Deneva M. 
Published: January 2005

AbstractThe kinetics and mechanism of ozone reactions with aliphatic ethers in CCl4 solution have been investigated with a set of six symmetrical ethers: ethyl, chloroethyl, iso‐propyl, n‐butyl, iso‐amyl, and n‐amyl. The corresponding kinetic constants at ambient temperature are 3.1, 0.035, 5.4, 6.3, 6.8, and 7.8 1/(mol s). Upon ozonation of n‐butylether the main products are butylalcohol, butylaldehyde (butyric acid), and butylbutyrate. A common precursor of these products is the α‐hydrotrioxybutylether. Experimental values of the preexponential factors are compared with those calculated according to the activation complex theory with linear or cyclic form of the activated complex. The cyclic form of the activated complexes is unfavorable because of the kinetic factor. Abstraction of hydrogen atom or the far less probable hydride ion abstraction from α‐position in the ether molecules is the rate‐determining step of ozonation. The rate‐determining factors are the electron density and geometry of the reaction center and the energy of the α‐CH bonds. © 1995 John Wiley & Sons, Inc.
Absolute rate constants for the addition of hydroxymethyl radicals to alkenes in methanol solution
Authors: Wu J. Q. , Fischer H. 
Published: January 2005

AbstractAbsolute rate constants and their temperature dependencies were determined for the addition of hydroxymethyl radicals (CH2OH) to 20 mono‐ or 1,1‐disubstituted alkenes (CH2 = CXY) in methanol by time‐resolved electron spin resonance spectroscopy. With the alkene substituents the rate constants at 298 K (k298) vary from 180 M−1s−1 (ethyl vinylether) to 2.1 middot; 106 M−1s−1 (acrolein). The frequency factors obey log A/M−1s−1 = 8.1 ± 0.1, whereas the activation energies (Ea) range from 11.6 kJ/mol (methacrylonitrile) to 35.7 kJ/mol (ethyl vinylether). As shown by good correlations with the alkene electron affinities (EA), log k298/M−1s−1 = 5.57 + 1.53 · EA/eV (R2 = 0.820) and Ea = 15.86 − 7.38 · EA/eV (R2 = 0.773), hydroxymethyl is a nucleophilic radical, and its addition rates are strongly influenced by polar effects. No apparent correlation was found between Ea or log k298 with the overall reaction enthalpy. © 1995 John Wiley & Sons, Inc.
An unusual example of hidden kinetic information in unpublished Ph.D. theses
Authors: Gowenlock Brian G. 
Published: January 2005

AbstractThe pressure to publish is a common feature of university life. As a result it is now rare to find that a considerable body of excellent experimental work can lie hidden in unpublished Ph.D. theses. In North America the availability of Dissertation Abstracts has given access to the summaries of theses which might otherwise have passed notice by interested workers and this has often led to the avoidance of unnecessary duplication of work. In other countries such informative details can remain unnoticed in university libraries. From my own experience of over 48 years in research in chemical kinetics I know of a substantial group of unpublished Ph.D. theses which resulted from over 20 years of research supervision by Dr. Charles Horrex of the University of St. Andrews, Scotland. Unlike most academics he was unduly cautious in publishing work which he supervised even though this was urged upon him by the examiners of these theses, myself included. As a result, from all the work which he initiated in St. Andrews (1947–77) only one preliminary communication resulted [1], and the studies which dealt with the enthalpy of formation and reactions of benzyl radicals are known only to a very small number of gas kineticists. I therefore wish to draw the attention of the community of kineticists to the following Ph.D. theses which are deposited in the Library of the University of St. Andrews. © 1995 John Wiley & Sons, Inc.
Products of the gas‐phase OH radical‐initiated reactions of 4‐methyl‐2‐pentanone and 2,6‐dimethyl‐4‐heptanone
Authors: Atkinson Roger , Aschmann Sara M. 
Published: January 2005

AbstractThe gas‐phase reactions of the OH radical with 4‐methyl‐2‐pentanone and 2,6‐dimethyl‐4‐heptanone have been investigated in the presence of NOx. Acetone and 2‐methylpropanal were identified and qualified as products of both reactions. The acetone yield from 2,6‐dimethyl‐4‐heptanone increased after addition of NO to reacted mixtures, indicating that acetone is formed through the intermediary of an acyl radical. The acetone and 2‐methylopropanal formation yields were determined to be 0.78 ± 0.06 and 0.071 ± 0.011, respectively, from 4‐methyl‐2‐pentanone and 0.68 ± 0.11 and 0.385 ± 0.034, respectively, from 2,6‐dimethyl‐4‐heptanone. The possible reaction mechanisms are discussed and compared with these product data, and it is concluded that the experimental data provide direct evidence for isomerization of the (CH3)2CHCH2C(O)CH2C(O) (CH3)2 alkoxy radical formed from 2,6‐dimethyl‐4‐heptanone. However, the isomerization rates of the alkoxy radicals formed from the ketones depend on whether the H‐atom abstracted is on a carbon atom α or β to the >CO group, with H‐atom abstraction from CH bonds on the β carbon atoms being significantly faster than from CH bonds on the α carbon atoms. © 1995 John Wiley & Sons, Inc.
Kinetics of the reactions of atomic chlorine with H2S, D2S, CH3SH, and CD3SD
Authors: Nicovich J. M. , Wang S. , Wine P. H. 
Published: January 2005

AbstractTime‐resolved resonance fluorescence detection of atomic chlorine following 266‐nm laser flash photolysis of Cl2CO/RSR'/N2 mixtures has been employed to study the kinetics of Cl reactions with H2S(k1), CH3SH(k2), D2S(k3), and CD3SD(k4) as a function of temperature (193–431 K) and pressure (25–600 torr). Arrhenius expressions which describe our results are (units are 10−11 cm3molecule−1s−1; uncertainties are 2σ, precision only) k1 = (3.69 ± 0.33) exp[(208 ± 24)/T], k2 = (11.9 ± 1.7) exp[(151 ± 38)/T], and k3 = (1.93 ± 0.32) exp[(168 ± 42)/T]. The Cl + CD3SD reaction has been studied at 299 K and 396 K; values for k4 at these two temperatures are essentially the same as those measured for k2. Our results are compared with earlier studies and the mechanistic implications of observed negative activation energies and HD kinetic isotope effects are discussed. © 1995 John Wiley & Sons, Inc.
Kinetics of the reaction of O(3P) with CF3NO
Authors: Thorn R. P. , Nicovich J. M. , Cronkhite J. M. , Wang S. , Wine P. H. 
Published: January 2005

AbstractA laser flash photolysis‐resonance fluorescence technique has been employed to study the kinetics of the reaction of O(3P) with CF3NO (k2) as a function of temperature. Our results are described by the Arrhenius expression k2(T) = (4.54 ± 0.70) × 10−12 exp[(−560± 46)/T] cm3molecule−1 s−1 (243 K ⩽ T ⩽ 424 K); errors are 2σ and represent precision only. The O(3P) + CF3NO reaction is sufficiently rapid that CF3NO cannot be employed as a selective quencher for O2(a1Δg) in laboratory systems where O(3P) and O2(a1Δg) coexist, and where O(3P) kinetics are being investigated. © 1995 John Wiley & Sons, Inc.
Kinetics and mechanism of the atmospheric oxidation of tertiary amyl methyl ether
Authors: Smith D. F. , Mciver C. D. , Kleindienst T. E. 
Published: January 2005

AbstractTertiary‐amyl methyl ether (TAME) is proposed for use as an additive to increase the oxygen content of gasoline as stipulated in the 1990 Clean Air Amendments. The present experiments have been performed to examine the kinetics and mechanisms of the atmospheric removal of TAME. The kinetics of the reaction of OH with TAME was examined by using a relative rate technique in which photolysis of methyl nitrite or nitrous acid was used as the source of OH. The OH rate constant for TAME and two major products (t‐amyl formate and methyl acetate) were measured and yields for ten products were determined as primary products from the reaction.Values determined for the rate constants for the reaction with OH were 5.48 × 10−12 (TAME), 1.75 × 10−12 (t‐amyl formate), and 3.85 × 10−13 cm3 molec−1 s−1 (methyl acetate) at 298 ± 2 K. The primary products (with corrected yields where required) from the OH + TAME that have been observed include (1) t‐amyl formate (0.366), methyl acetate (0.349), acetaldehyde (0.43, corrected), acetone (0.036), formaldehyde (0.549), t‐amyl alcohol (0.026), 3‐methyoxy‐3‐methyl‐butanal (0.044, corrected), t‐amyloxy methyl nitrate (0.029), 3‐methyoxy‐3‐methyl‐2‐butyl nitrate (0.010), and 2‐methoxy‐2‐methyl butyl nitrate (0.004). Mechanisms leading to these products involve OH abstraction from each of the four different hydrogen atoms of TAME. © 1995 John Wiley & Sons, Inc.
Complexes of hydroxamates X. Interaction of methioninehydroxamic acid with Ni(II) and Pd(II). Kinetics and reaction mechanism
Authors: Marafie Hayat M. , Shuaib Nadia , Ibrahim Khalid , El‐Ezaby Mohamed S. 
Published: January 2005

AbstractThe kinetic stopped flow method has been used to study the reaction rates of Ni(II) and Pd(II) with methioninehydroxamate (MX). Two reaction rates were observed in the MXNi(II) system whereas three rates were observed in the MXPd(II) system. Most of the rate steps were dependent on pH as well as on TMX (total concentration of methioninehydroxamate). The observed pseudo‐first‐order rate constants at constant pH are expressed empirically as k = mi + m′i TMX. The parameters mi and m′i are pH‐dependent. It has been concluded that hydroxy metal species contributed to the explanation of the rate of the metal complexation with MX. Similar systems have been correlated with the systems of current work. © 1995 John Wiley & Sons, Inc.
Gas‐phase kinetics of elimination reactions of pentane‐2,4‐dione derivatives
Authors: Al‐Awadi Nouria A. , El‐Nagdi Mohamed H. , Mathew Tommy 
Published: January 2005

AbstractGas‐phase elimination reactions of pentane‐2,4‐dione, methyl acetoacetate, ethyl acetoacetate, 3‐phenylhydroazopentane‐2,4‐dione, and ethyl 3‐oxo‐2‐phenyl‐hydrazonobutyrate have been measured in the temperature ranges of 744–783, 662–695, 614–663, 604–664, and 503–555 K, respectively, using a flow‐thermolysis technique. These compounds undergo unimolecular first‐order elimination reactions, for which log A = 11.9, 11.2, 11.7, 11.5, and 11.7 s−1 and Ea = 198.3, 167.1, 141.7, 165.6, and 141.7 kJ mol−1, respectively. The kinetic data and product analysis shows that the reactions are highly affected by the electronic nature of the substituents at the carbonyl and methylene carbon atoms of the substrates investigated. © 1995 John Wiley & Sons, Inc.
Mn(VII) oxidation using cetyltrimethylammonium permanganate: Self‐oxidation of CTAP and oxidation of benzyl alcohol
Authors: Dash Sukalyan , Mishra Bijay K. 
Published: January 2005

AbstractCetyltrimethylammonium permanganate (CTAP) has been prepared and characterized from IR and NMR data. At room temperature the compound is stable when kept in dark but at 115°C it undergoes a violent thermal decomposition. In different organic solvents self‐oxidation takes place giving rise to pentadecanal. The rate of self‐oxidation in different solvents are in the order: benzonitrile > benzene > chloroform > carbon tetrachloride. A mechanism involving proton transfer from the β‐methylene group to the permanganate ion, thereby forming an olefinic intermediate, has been suggested. The oxidation kinetics of benzyl alcohol have been studied in chloroform medium. The thermodynamic parameters for the oxidation reactions have been evaluated. © 1995 John Wiley & Sons, Inc.
The gas‐phase elimination kinetics of 3‐buten‐1‐methanesulphonate and 3‐methyl‐3‐buten‐1‐methanesulphonate
Authors: Chuchani Gabriel , Martin Ignacio , Dominguez Rosa M. 
Published: January 2005

AbstractThe elimination kinetics of the title compounds were carried out in a static system over the temperature range of 290–330°C and pressure range of 29.5–124 torr. The reactions, carried out in seasoned vessels with allyl bromide, obey first‐order rate law, are homogeneous and unimolecular. The temperature dependence of the rate coefficients is given by the following Arrhenius equations: for 3‐buten‐1‐methanesulphonate, log k1(s−1) = (12.95 ± 0.53) − (175.3 ± 5.9)kJ mol−1(2.303RT)−1; and for 3‐methyl‐3‐buten‐1‐methanesulphonate, log k1(s−1) = (12.98 ± 0.40) − (174.7 ± 4.5)kJ mol−1(2.303RT)−1. The olefinic double bond appears to assist in the rate of pyrolysis. The mechanism is described in terms of an intimate ion‐pair intermediate. © 1995 John Wiley & Sons, Inc.
Reactions of Azolium cations. II [1]. Regioselective N2 alkylation of 5‐aryltetrazoles with isopropyl alcohol in sulfuric acid media: Effect of electronic properties of aryl substituents on the reaction rate
Authors: Koren A. O. , Gaponik P. N. , Ostrovskii V. A. 
Published: January 2005

AbstractKinetics of regioselective N2 alkylation of a series of 5‐(R‐phenyl)tetrazoles with isopropyl alcohol has been studied in 88.2, 94.3, and 98.3% (w/w) sulfuric acid at 25°. The true rate constants were evaluated, logarithms of which were found to correlate with σ° constants of phenyl substituents as log k = −0.488 σ° − 0.417. Small value of Hammett constant ρ is evidence of a considerable isolation of the reaction center from the influence of the substituent at position C5 of the heteroring. This conclusion is confirmed by results of MNDO quantum chemical calculations of a series of 5‐substituted tetrazolium cations. A correlation between logarithms of the true rate constants and the calculated net effective charges on atoms N2(N3) for 5‐(R‐phenyl)tetrazolium cations has been revealed. © 1995 John Wiley & Sons, Inc.
Determination of the rate of formation of the schiff bases of pyridoxal 5′‐phosphate with polyallylamine
Authors: Del Vado M. Angeles Garcí , Rodríguez Cardona Angel F. , Echevarría Gerardo R. , Santos Blanco José G. , Zumel Consuelo López , Blanco Francisco García 
Published: January 2005

AbstractThe formation constants of the Schiff bases of pyridoxal 5′‐phosphate with polyallylamine were determined over the pH range of the acetic‐acetate buffer (3.9–5.5) at an ionic strength of 0.1 M and a temperature of 25°C. The results were consistent with the rapid formation of an ionized carbinolamine, T+, followed by deprotonation, in the rate‐determining step, to a neutral carbinolamine, T°. Subsequent dehydration of T° in a rapid step yields the final Schiff base. The formation of T+ is a concerted process subject to specific acid catalysis. © 1995 John Wiley & Sons, Inc.
Chlorination of N‐Methylacetamide: A kinetic study
Authors: Antelo J. M. , Arce F. , Parajó M. , Pousa A. I. , Pérez‐moure J. C. 
Published: January 2005

AbstractIn the pH range 4.3–13, the reaction between N‐methylacetamide (NMA) and sodium hypochlorite in dilute aqueous solution to give N‐chloro‐N‐methylacetamide (CINMA) was found to be far slower than analogous reactions affording N‐chloramines or N‐chloroamino acids. The rate expression for chlorination was first‐order each in [NMA] and [Cltot] (the total concentration of chlorinating species). A rate constant calculated for chlorination by each chlorinating species indicated that the order of increasing reactivity was HClO < ClO− < Cl2 < CH3COOCl (formed in the presence of acetic/acetate buffer). At pH > 7 the reaction rate was unaffected by variations in [Cl−] or pH, but under acidic conditions the rate increased with [Cl−] and decreasing pH. Regardless of pH, the reaction rate was not affected by changes in ionic strength. The influence of temperature on the reaction rate was also studied which allowed calculation of thermodynamic activation parameters for the N‐chlorination reaction. © 1995 John Wiley & Sons, Inc.
Dissolution and dispersion of CO2 from a liquid CO2 pool in the deep ocean
Authors: Shindo Yuji , Fujioka Yuichi , Komiyama Hiroshi 
Published: January 2005

AbstractLiquid CO2 sequestration in a bathymetric depression at depths greater than 3700 m in the ocean has been proposed as a mitigation strategy for the reduction of atmospheric CO2 emissions. Kinetic studies on the dissolution of CO2 from the liquid CO2 pool, the diffusion in the ocean, and advection of CO2 by the bottom ocean current are carried out. A thin membrane of CO2 hydrate on the liquid CO2 pool controls the CO2 dissolution into the overlaying seawater, the thickness of a static layer between the surface of liquid CO2 and the upper bottom ocean current reduces the CO2 diffusion, and the bottom ocean current dilutes the CO2 concentration. These effects are explicity formulated in an equation, and it is predicted that ocean CO2 sequestration at a depth larger than 3700 m will greatly reduce the pH change caused by CO2 dispersion in the ocean. © 1995 John Wiley & Sons, Inc.
Kinetics of the reactions of NCO with NO and NO2
Authors: Juang Dai Yin , Lee Jiunn‐shin , Wang Niann S. 
Published: January 2005

AbstractThe rate coefficients of the reactions of NCO radicals with NO and NO2: (1) NCO + NO → products (293–836 K) and : (2) NCO + NO2 → products (294–774 K) were measured by means of laser photolysis and laser induced fluorescence technique in the indicated temperature ranges. NCO radicals were produced from the reaction of CN, from photodissociation of ICN or BrCN, with O2. The concentration of NCO was monitored with a dye laser set at 414.95 nm. We determined k1 = 1.73 × 10−5 T−2.01 exp(−470/T) cm3 molecule−1 s−1 that agrees with published results at room temperature and confirms the temperature dependence of an early report. A non‐Arrhenius negative temperature dependence of k2 was observed in this work that agrees satisfactorily with results for a shock tube18 near 1250 K. We obtained k2 = 6.4 × 10−10 T−0.646 exp(164/T) cm3 molecule−1 s−1 for 1250 K ≥ T ≥ 294 K by combining data of these two measurements. Our result at 294 K and the temperature dependence disagree with results of two previous investigations. © 1995 John Wiley & Sons, Inc.
Über die Einwirkung von Alkali und Alkoholen auf Ortho‐Chlornitrobenzol
Authors: Brand K. 
Published: January 2005

Abstract1. Beim Behandeln von o‐Chlornitrobenzol mit konzentriertem Natriummethylat erhält man entweder a‐Azo‐ oder o‐Azoxydichlorbenzol.
Die Kupfersalze der Ferro‐ und Ferricyanwasserstoffsäure
Authors: Müller Erich , Wegelin G. , Kellerhoff E. 
Published: January 2005

Abstract1. Es wurde ein vollständiger Überblick gegeben über die Zusammensetzung sämtlicher, beim Mischen von Lösungen des Kupfersulfats, des Kupferchlorürs (bzw. Kupferchlorürchlorkaliums und der Kupferchlorürchlorwasserstoffsäure), des Ferrocyankaliums, (der Ferrocyanwasserstoffsäure) und des Ferricyankaliums entstehenden Niederschläge für die verschiedensten Mischungsverhältnisse, und festgestellt, daß diese in der Mehrzahl der Fälle keine einheitlichen Verbindungen, sondern Gemische vorstellen.
Über die Löslichkeit der Carbonate des Strontiums, des Bariums und der Schwermetalle in Wasser unter hohen Kohlendioxyddrucken sowie über die Eigenschaften solcher Lösungen
Authors: Haehnel Otto 
Published: January 2005

AbstractEs wurde die Löslichkeit des Strontiumcarbonats und des Bariumcarbonats in Wasser unter hohen Kohlendioxyddrucken bestimmt und dabei festgestellt, daß die Löslichkeit dieser beiden Alkalicarbonate mit zunehmenden CO2‐Druck etwa in gleichen Maße zunimmt wie die des Calciumcarbonats unter den gleichen Bedingungen. Die gebildeten Bicarbonate sind beständig: Das Sr(HCO3)2 oberhalb 35 Atmosphären, das Ba(HCO3)2 oberhalb 25 Atmosphären. Die gesättigten Lösungen enthalten: 0,57% Sr(HCO3)2, 0,79% Ba(HCO3)2.
Über die Einwirkung schwefligsaurer Salze auf aromatische Amino‐ und Hydroxylverbindungen. Über Erweiterungen der Sulfitreaktionen auf Resorcin (Synthese von m‐Oxy‐azofarbstoffen), p‐Phenylendiamin und ihre Derivate
Authors: Bucherer Hans Th. , Hoffmann Erich 
Published: January 2005

Abstract
Die Eigenschaften der aus Resorcin durch Behandlung mit Bisulfit, über den entsprechenden Di‐Schwefligsäureester, erhältlichen Resorcinmonosulfonsäure sprechen für die Konstitution OH: OH: SO3H = 1:3:4.
Einwirkung ultravioletter Strahlen auf Pyridin. (I. Mitteilung). Ein neuer Nachweis einiger primärer aromatischer Amine und des Pyridins
Authors: Freytag Hans , Neudert Walter 
Published: January 2005

Abstract1. Es wurde erstmalig — im Gegensatz zu D. Berthelot und H. Gaudechon — bewiesen, daß reines Pyridin unter dem Einfluß ultravioletter Strahlen kleiner als 300 μμ verändert wird. Diese Veränderung ist schon äußerlich durch eine Gelbfärbung (beobachtet im unfiltrierten UV‐Licht) bzw. Gelbbraunfärbung (im Tageslicht beobachtet) erkenntlich.