bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zur Struktur des γ‐MnO2
Authors: Giovanoli R. , Maurer R. , Feitknecht W. 
Published: December 2004

AbstractBy treating Mn3O4 of a specific surface of about 30 m2/g with hot diluted nitric acid, a relatively well crystallised γ‐MnO2 has been obtained. It consists of flat needles of approximately 40,000 × 2000 × 500 Å. Selected area electron diffraction patterns from such single crystals give the (b c) zone of Ramsdellite with c as needle axis. The reflections are broadened in the b‐direction, which is consistent with the shift and broadening of the X‐ray reflections of similar type. The X‐ray Guinier pattern is consistent with the postulated intergrowth structure, proposed by BYSTRÖM and later by de Wolff. Hence the present product consists of a Ramsdellite matrix with statistically distributed Pyrolusite microdomains. The domains are supposed to have the size of one cell only in the b‐direction and of a few cells in the a‐direction, and to be present in relatively small concentrations. From the absence of satellites in the electron diffraction pattern it follows that the domains are disordered and do not form a super‐lattice with giant periods as might be supposed. There is no need to distinguish between η‐ and γ‐MnO2 (GLEMSER [2]); the whole group of varieties, hitherto distinguished by Glemser as «η‐ and γ‐MnO2», have the same lattice and differ only by crystallite size and concentration of microdomains.
Die Lipide aus einjährigen Kinderhirnen
Authors: Lesch Peter , Bernhard Karl 
Published: December 2004

AbstractPure lipids from different parts of brains from 1 year old children have been isolated and separated into different fractions. Compared with previous results concerning brains of new‐born and 6 weeks old children clear differences are found, i.e. an increase of cerebrosides and a decrease of lecithines with advancing years and progressing myelinization.
Beiträge zur Chemie der Si‐N‐Bindung, XI [1] polymere 1, 3‐diaza‐2‐sila‐cyclopentane
Authors: Fink Walter 
Published: December 2004

AbstractLinear polymers are built up by polycondensation of aminodimethylsilyl‐ or aminodiphenylsilyl‐terminated monomeric or oligomeric 1,3‐diaza‐2‐sila‐cyclo‐pentanes with bisphenols or disilanols. The thermal properties of the polymers are determined.
Die Protonierung von 1‐Formyl‐ und 1‐Acetyl‐azulenen
Authors: Meuche Doris , Dreyer D. , Hafner K. , Heilbronner E. 
Published: December 2004

AbstractNMR. data show that protonation of 1‐formyl‐azulene yields essentially a one‐to‐one mixture of conjugate acids in which the hydroxyl group assumes the syn‐planar or anti‐planar configuration relative to the tropylium nucleus. The presence of a minute amount of protonation in position 3 is demonstrated by the rapid hydrogendeuterium exchange in this position. Steric interference in 1‐formyl‐azulenes with a methyl group in the peri position 8 favours the anti‐planar configuration. As shown by one example, the conjugate acids of 1‐acetyl‐azulenes without substituents in positions 2 or 8 assume the anti‐planar configuration. In 1‐acetyl‐azulenes carrying a methyl group in position 8, addition of a proton to the carbon centre 1 is the preferred route of protonation, as a consequence of the accompanying strain release.
Die Glykoside der Wurzeln von Gongronema taylorii (SCHLTR. & RENDLE) BULLOCK. Glykoside und Aglykone, 292. Mitteilung
Authors: Jaeggi K. A. , Weiss Ek. , Wehrli W. , Reichstein T. 
Published: December 2004

AbstractThe roots of Gongronema taylorii are rich in glycosides. These glycosides form a complex mixture of substances, of which some are closely related. From this mixture, six more or less pure but amorphous glycosides could be separated. Mild acid hydrolysis followed by alkaline hydrolysis led to the isolation of 5α‐dihydrosarcostin (1) and some tayloron (3), whose probable structures have been reported earlier. In the original mixture, these genins are esterified predominantly with benzoic and cinnamic acids, and are also bound through glycosidic linkages to a series of sugars of which the following four could be identified by paper and thin layer chromatography: cymarose, digitoxose, oleandrose and pachybiose. Pachybiose and its two anomeric methyl glycosides have been isolated for the first time in a cristalline state.
Die Glykoside der Blätter von Isoplexis isabelliana (WEBB) MASF.. 3. Mitteilung
Authors: Freitag Hellmut , Spengel Sigrid , Linde Horst H. A. , Meyer Kuno 
Published: December 2004

AbstractThe isolation, characterisation and chemical investigation of the cardiac glycosides of the dried leaves of Isoplexis isabelliana (WEBB) MASF. are described. 7 glucosides B, D, E, J (monoside), K, M, and 1 (monoside) could be obtained in homogenous form, 3 others were mixtures (“A” = A1 + A2, “C” = C1 + C2, and “G” = G + K). The substances B (gluco‐evatromonoside), D (cheiroside A), E (digitoxigenin‐glucosido‐6‐deoxyglucoside), J (digitoxigenin glucoside), and M (digitalinum verum) could be identified with known substances. The new glycosides are derived from 3 genins: digitoxigenin, uzarigenin, and xysmalogenin, which are directly bound to one of the following sugars: 6‐deoxyglucose, 2‐O‐acetyl‐6‐deoxy‐D‐glucose, 2,6‐dideoxy‐D‐arabinohexose (= D‐canarose), and 2,6‐dideoxy‐D‐ribohexose (= D‐digitoxose), terminated by a glucose unit. –Canarobiose, a new crystalline disaccharide of D‐glucose and D‐canarose, has also been obtained. –Apart from these cardiac glycosides 3 C21‐steroids have been isolated (in addition to the 2 known genins γ‐digiprogenin and purpnigenin), and their structures elucidated. The presence of 2 sapogenins has been detected.
Sur l'acylation des méthylfluorènes II [1]. Benzoylation et acétylation du méthyl‐2‐fluorène
Authors: Chardonnens Louis , Dousse Roland 
Published: December 2004

AbstractBenzoylation and acetylation of 2‐methyl‐fluorene according of Friedel‐Crafts in carbon disulfide with aluminium chloride yielded the corresponding 7‐acylderivatives. By oxydation the benzoyl derivative gave 7‐benzoyl‐9‐oxo‐fluorene‐2‐carboxylic acid, which was decarboxylated to the known 2‐benzoyl‐9‐oxo‐fluorene. By reduction according to Clemmensen the acetyl derivative gave 2‐methyl‐7‐ethylfluorene.
Sur les spectres d'absorption infrarouge, entre 2,5 et 16 μ, de semicarbazones
Authors: Naves Yves‐René , Jacot‐Guillarmod André , Zanesco Cornélia Rodica 
Published: December 2004

AbstractThe spectra of 120 semicarbazones in the solide state have been studied between 2.5 and 16 microns in order to correlate absorptions and structures. We have considered most particularly the absorptions v(N‐H) and the so‐called amid‐I and amid‐II bands.
De la chimie des ptérines. 19e communication [1]. Essai d'interprétation des propriétés chimiques des ptérines au moyen de calcul d'orbitales moléculaires
Authors: Bobst A. 
Published: December 2004

AbstractHMO and semi‐empirical SCF calculations on pterine systems of biochemical interest have been performed. The most basic center of each molecule has been determined by correlating the perturbation effect on the transition energy and the spectroscopic data. Additional calculations attempt to show why the redox‐system which interfers in hydroxylation reactions consists of 5,6,7,8‐tetrahydropterine and a quinoidic form. Finally the formation of radicals in the oxidation step of hydrogenated pterines is discussed.
Über Alkaloide aus Laurelia novae‐zelandiae A. CUNN. 5. Mitteilung über natürliche und synthetische Isochinolinderivate
Authors: Bernauer Karl 
Published: December 2004

AbstractFrom an extract of Laurelia novae‐zelandiae A. CUNN. the aporphine alkaloids (−)‐pukateine (I), (−)‐pukateine methyl ether (II), (−)‐roemerine (IV), (−)‐mecambroline (V), (+)‐boldine (VII), (+)‐isoboldine (VIII), (+)‐laurolitsine (IX), and the proaporphine alkaloid (+)‐stepharine (X) were isolated. Compounds II and V were up to now not described as natural alkaloids. These and the alkaloids IV, VII, VIII, IX and X are new for L. novae‐zelandiae.
Die Cardenolide der Samen von Mallotus paniculatus MÜLL.‐ARG. (Euphorbiaceae). 2. Mitt.: Strukturbeweise. Glykoside und Aglykone, 295. Mitteilung
Authors: Roberts K. D. , Weiss Ek. , Reichstein T. 
Published: December 2004

AbstractThe structures of the following cardenolides, isolated from Mallotus paniculatus have been reported: Genin D = 11‐oxo‐uzarigenin (1), genin F = mallogenin = 11β‐hydroxy‐uzarigenin (3). Glycoside K = mallosid (5) is an L‐rhamnoside of mallogenin, and glycoside L (21) is an L‐rhamnoside of a new genine which we have called panogenin. Panogenin was isolated in crystalline form by the hydrolysis of panoside, and its structure was found to be that of 11β‐hydroxy‐coroglaucigenin (23). Glycoside N = glucopanoside (22), the predominant glycoside of the unfermented seeds, was found to contain one molecule of D‐glucose bound in glycosidic form; its position was not investigated.
Zur Nomenklatur einer neueren Klasse von Sesquiterpenen
Authors: Godtfredsen W. O. , Grove John Frederick , Tamm C. H. 
Published: December 2004

AbstractThe name «trichothecane» (I) with a particular numbering is proposed for the basic skeleton of a series of related sesquiterpenes, the corresponding rearranged skeleton (II) (its atoms with the numbers they had in I) is called «apo‐trichothecane».
Photoreaktionen von Iminiumsalzen mit Methanol und mit Formamid
Authors: Dörscheln W. , Tiefenthaler H. , Göth H. , Cerutti P. , Schmid H. 
Published: December 2004

AbstractBy irradiation in methanol at ∼250 nm of iminium salts, e.g. cyclohexylidene‐pyrrolidinium perchlorate (1), in the absence of oxygen and in the presence of benzophenone as sensitizer, good yields of methanol addition products to the C,N‐double bond (e.g. 8) could be obtained. These can be classed as β‐amino‐alcohol derivatives.
Die Reaktion von halogenierten s‐Triazinen mit Cyclopentadienylnatrium. 2. Mitteilung
Authors: Neuenschwander M. , Schaltegger H. 
Published: December 2004

AbstractAus den beim Umsatz von 2‐Chlor‐4,6‐dimethoxy‐s‐triazin und von 2,4‐Dichlor‐6‐methoxy‐s‐triazin mit Cyclopentadienylnatrium dargestellten dimeren Cyclopentadienyltriazinen wurden durch Erhitzen im Hochvakuum die monomeren 2‐Cyclopenta‐1′,3′‐dienyl‐s‐triazine II erhalten. Die durchlaufende Konjugation der überwiegenden Monomeren wird durch das NMR.‐Spektrum der unter schonenden Bedingungen dargestellten Maleinsäure‐Addukte bestätigt.
Stoffwechselprodukte von Mikroorganismen. 58. Mitteilung [1]. Neue Makrotetrolide aus Actinomyceten
Authors: Gerlach H. , Hütter R. , Keller‐Schierlein W. , Seibl J. , Zähner H. 
Published: December 2004

AbstractAus einem Stamm der Spezies Streptomyces flaveolus (WAKSMAN) WAKSMAN et HENRICI wurden neben Nonactin, Monactin, Dinactin und Trinactin vier neue Makrotetrolide isoliert, an deren Aufbau ausser den bekannten Hydroxysäuren Nonactin‐säure und Homononactinsäure auch die Bishomononactinsäure (VIII) beteiligt ist.
Zusatzgerät zu Spektropolarimetern für die Lösumgsmittelkompensierte Messung der magneto‐optischen Rotationsdispersion (MORD.)
Authors: Clerc J. T. , Wipf H.‐K. , Simon W. 
Published: December 2004

AbstractA simple attachment to a spectropolarimeter for recording fully compensated magneto‐optical rotatory dispersion (MORD.) spectra is described.
Über die 1,2‐Verschiebung der Säureamidgruppe bei der Benzilsäureumlagerung von Chinisatin
Authors: Dahn H. , Donzel A. 
Published: December 2004

AbstractLabelling with 14C shows that the benzilic acid type rearrangement of quinisatine (I) to isatine (III) proceeds essentially by a 1,2‐shift of the intact carbonamid group to the carbonyl group at C‐4. The reaction rate was determined by polarography.
[2.2. …] Metacyclophane
Authors: Burri K. , Jenny W. 
Published: December 2004

AbstractThe synthesis of [2.2.2] metacyclophane (yield 7,5%), [2.2.2.2]metacyclophane (yield 1,7%), [2.2.2.2.2]metacyclophane (yield 5,1%), [2.2.2.2.2.2]metacyclophane (yield 3,1%) and [2.2.2.2.2.2.2.2]metacyclophane (yield 0,5%) by a WURTZ reaction with α,α'‐dibromo‐m‐xylene is described. The structure of the new ring systems was confirmed by UV.‐, NMR.‐ and mass spectra analyses. In connection with the resulting melting points and NMR.‐spectra probable conformations of these higher ring systems are discussed.
Fragmentierung von α,β‐Epoxy‐ketoximen zu Acetylenketonen. Vorläufige Mitteilung
Authors: Wieland P. , Kaufmann H. , Eschenmoser A. 
Published: December 2004

AbstractA new version of the oxidoketone‐alkynone fragmentation is described. Two steroidal α,β‐oxido‐oximes are shown to fragment to the corresponding alkynones when treated with hydroxylamine‐O‐sulfonic acid in alcaline solution at room temperature.
Recherches sur la formation et la transformation des esters LXXVII [1]. Etude à l'aide de H2[18O] de la scission de quelques monoesters phosphoreux et de l'acide propargyl‐benzènephosphonique
Authors: Cherbuliez Emile , Moll H. , Hunkeler F. , Prince R. , Rabinowitz J. 
Published: December 2004

Abstract(1) Monopotassium phosphite KH2PO3 heated at 300°C with CO[18O] exchanges one atom of oxygen after 3 hours, one to two atoms after 6 hours, and its three O atoms after 12 hours; the probable mecanism of this exchange is discussed. When the same treatment is carried out in the presence of o‐phenylene diamine hydrochloride, the exchange is total (three O) after 3 hours at 300°C. Treated by this last procedure, benzenephosphonic acid C6H5PO(OH)2 undergoes equally a total exchange of its O atoms in 3 hours.
Apparatur zur Molekulargewichtsbestimmung an hochverdünnten (10−4M). Lösungen mittels Dampfdruckosmometrie
Authors: Dohner R. E. , Wachter A. H. , Simon W. 
Published: December 2004

AbstractA vapour pressure osmometer for the determination of number‐average molecular weights is described. With this improved design 10−4M solutions can be measured with a standard deviation of 1.3% (carbon tetrachloride, 30°C). Molecular weight determinations up to 160000 (± 7.5%; polystyrene in carbon tetrachloride) are presented.
Etude du transfert d'énergie en milieu liquide à 1'aide du coupage de la scintillation
Authors: Cosandey Maurice , Lerch Pierre 
Published: December 2004

AbstractThe scintillation quenching effect in a liquid medium (toluene) has been studied for numerous compounds W. The quenching power ξ = d(I0/I)/d[W] of most aliphatic compounds is small, less than 1 1/mole, and may be interpreted by a collision theory. The ketones, and in general all compounds with a high extinction coefficient for toluene fluorescence, have such a high quenching effect that it appears to be due to a transfer by resonance. The experimental data fit the theory perfectly if, in the expression for collisional energy transfer, the average molecular radius is replaced by half the FÖRSTER critical resonance distance, and if a coefficient of migration of energy is added to the diffusion constant. The transfer is more or less reversible. For compounds which can only be deecxitated by a π‐π* transition, it is completely reversible, and quenching is null. When the excitation energy can be degraded by a n‐π* transition, the transfer is completely irreversible, and the quenching is maximum. For intermediate cases, the quenching effect is interpreted with the supplementary hypothesis of an intramolecular energy transfer.
Etude des composés d'addition des acides de Lewis XXX [1]. Note préliminaire sur les composés d'addition entre aldéhydes et TiCl4
Authors: Weber R. , Susz B. P. 
Published: December 2004

AbstractThe adducts of acetic, benzoic, cinnamic, and anisic aldehydes with TiCl4 have been prepared, and the IR. spectra of the compounds, in the solid state or in solution in CH2Cl2, studied. The lowering of the carbonyl frequency shows that the acceptor is linked by a dative bond to the carbonyl oxygen atom acting as donor.
Recherches sur les arǒmes. 16e communication [1]. Sur l'arǒme du cacao III
Authors: Flament I. , Willhalm B. , Stoll M. 
Published: December 2004

AbstractThe isolation and analysis of a cocoa concentrate is described: 62 constituents have been identified, 42 of which for the first time. Most identifications are based upon mass spectrometry combined in many cases with IR. spectrometry, and comparison with reference compounds. A number of minor constituents could not be identified.
Zur Synthese des Ecdysons IX. Mitteilung über Insektenhormone
Authors: Furlenmeier A. , Fürst A. , Langemann A. , Waldvogel G. , Hocks P. , Kerb U. , Wiechert R. 
Published: December 2004

AbstractA synthesis of ecdysone is described by which the insect moulting hormone can be readily prepared. Oxidation of ergosterol gave the 6‐keto‐Δ7‐function, and preparation of the Δ2‐olefine followed by stereospecific hydroxylation led to the 2β,3β‐glycol system. Ozonization furnished (20 S)‐2β,3β‐diacetoxy‐20‐formyl‐5α‐pregn‐7‐en‐6‐one into which the side chain was introduced by a Grignard reaction with 2‐methyl‐3‐butyn‐2‐ol tetrahydropyran‐2‐yl ether and a subsequent reduction of the triple bond. Hydroxylation at C‐14 and isomerization at C‐5 gave ecdysone. By an interchange of the sequence of the reactions C‐22 isoecdysone was obtained stereospecifically.
Photochemische Umwandlungen. XV [1] Photochemische Isomerisierung des exo‐Tricyclo[4.2.1.02′5]nona‐3,7‐dien‐Systems. Vorläufige Mitteilung
Authors: Eberbach W. , Prinzbach H. 
Published: December 2004

AbstractThe acetone sensitized isomerization of two exo‐tricyclo[4.2.1.02,5]nonadiene derivatives, of the corresponding tricyclo[4.3.0.02,5]nonadienes, and the photoisomerization of two bicyclo[4.3.0]nonatrienes by direct excitation are described.
Das Elektronenspektrum eines vinylogen Tropons (Die photochemische darstellung des 2‐Hydroxy‐guaj‐azulens)
Authors: Hagen R. , Heilbronner E. , Straub P. A. 
Published: December 2004

AbstractIrradiation of guaj‐azulene‐2‐sulfonic acid (VII) in 40 percent aqueous or methanolic sulfuric acid with light of 370 nm wave‐length yields 2‐hydroxy‐guaj‐azulene (V) or 2‐methoxy‐guaj‐azulene (X) respectively. The former compound (V) exhibits a keto‐enol tautomerism V ⇋ VI, the equilibrium constant of which is strongly dependent on solvent. The keto form VI contains the π‐electron system of a vinylogue tropone IV. The theoretical analysis of the electronic spectrum of VI, using a CI‐model of the PARISER‐PARR‐POPLE type, supports the previously proposed assignement of the electronic transitions observed in tropone (I), benzotropone (II) and naphthotropone (III).
Elektronenstruktur und physikalisch‐chemische Eigenschaften von Azo‐Verbindungen. Teil XIV: Die Konformation des Benzalanilins
Authors: Haselbach E. , Heilbronner E. 
Published: December 2004

AbstractA re‐evaluation of the electronic spectra of benzalaniline (II), 3, 3‐dimethyl‐2‐phenyl‐indolenine (X), mono‐aryl substituted azomethines (XI, XIV, XV) and trimethylindolenine (XII) as well as of their conjugate acids strongly supports the hypothesis of ISMAILSKI& SMIRNOV[14] and of EBARA[15] that benzalaniline exists in a preferred peri‐perpendicular conformation. The same is true for N‐phenylazomethines. Then→ π* transition of a ‘planar benzalaniline’ has been located at 27 600 cm−1(ε ≈ 60).
Contribution à 1′étude des acides de CLEVE Le système quinaire Na+‐M++‐amino‐1‐naphtalène‐sulfonate‐6‐amino‐1‐naphtalène‐sulfonate‐7‐C1−‐H2O entre 0° et 75°
Authors: Rochat A. C. , Flatt R. 
Published: December 2004

AbstractThe solubility diagram of the quinary system Na+‐Mg++‐1‐anminonaphtalene‐6‐sulfonate‐1‐aminonaphtalene‐7‐sulfonate‐Cl−‐H2O has been partially investigated between 0° and 75°.From this diagram a simple and effective procedure to separate the two CLEVE'S acids has been calculated, with yields in acid 1.7 (extracted as sodium salt) of 95.1% and in acid 1.6 (obtained as magnesium salt) of 70.0%.This theoretical procedure was adapted to the fraction of a crude industrial mixture of CLEVE's acids.
Salzebullioskopie II Die Gültigkeit des salzebullioskopischen und salzkryoskopischen Grenzgesetzes in verschiedenen Inertsalz‐Fremdsalz‐Systemen
Authors: Magyar B. 
Published: December 2004

AbstractThe vapor pressure of a saturated salf solution (the salt acting as inert electrolyte) is lowered by foreign solutes by an amount which is proportional to the molal concentration of the foreign solute. Any ion not in common with the inert electrolyte is acting as a foreign solute. This effect is used in salt ebullioscopy, a new procedure for the determinaton of the relative weights of ions which has been described recently [2]: The number ν of foreign ions per formula unit of the solute is determined experimentally and permits the evaluation of relative ionic weights. It was found that the apparent number ν(m2) of foreign ions per mole of solute determined at different concentrations of the solute sows a linear dependence on concentration: v(m2) = νo + N · m2. The linearity has been tested on 31 systems differing in the pair foreign salt –inert salt. The largest deviation of νo from the true value of ν was 0,1. It is shown theoretically that the slope N is the sum of a stöichiometric term N*, and of a term caused by the change of the activity coefficient γ2 of the solute. Therefore, γ2 can be calculated from (N – N*). The nuclearity (n = 1/ν) of the antimony complex in the compound potassium antimony tartrate was found to be 2.
Totalsynthese des neuen Leguminosen‐Alkaloids Hystrin 16. Mitteilung über Leguminosen‐Alkaloide
Authors: Steinegger E. , Weber P. 
Published: December 2004

AbstractA total synthesis of hystrine has been realised with good yield by the introduction of a double link into the piperidine nucleus of synthetic ammodendrine, followed by deacetylation, and purification with the aid of the nitroso derivative.The identity of the synthetic product with authentic hystrine was established by its chromatographic behaviour, by UV.‐, IR.‐ and mass spectra as well as by the properties of its nitroso derivative. Thus the proposed structure of hystrine as 3‐(2, 3, 4, 5‐tetrahydropyrid‐6‐yl)‐1, 4, 5, 6‐tetrahydropyridine (V) is proved.
Chemie der Komplexe von Liganden mit schweren Donoratomen II. MÖSSBAUER‐Untersuchung der Eisenkomplexe von Di‐isopropyl‐dithiophosphat
Authors: Korecz L. , Burger K. , Jgrgensen C. K. 
Published: December 2004

AbstractThe MÖSSBAUER spectra of the new complexes Fe(dptp)3 and trans‐Fe(dptp)2py2 (dptp− = (C3H7O)2PS2−; py = C5H5N) are measured and discussed.
Thyrocalcitonin. I. Isolierung und Charakterisierung wirksamer Peptide aus Schweineschilddrüsen
Authors: Kahnt F. W. , Riniker B. , Macintyre I. , Neher R. 
Published: December 2004

Abstractα‐ and β‐thyrocalcitonic isolated from pig thyroids were found to be single‐chain polypeptides with 32 amino acid residues containing a disulphide bridge. Tryptic digestion yielded inactive hepta‐, undeca‐and tetradecapeptides, the amino acid composition of which is given. β‐thyrocalcitonin proved to be the methionine sulphoxide derivative of the easily oxidizable methionine peptide α‐thyrocalcitonin; thus, the designation β can be eliminated. Both peptides have a potency of about 200 MRC units/mg dry weight. They can readily be differentiated by their electrophoretic and chromatographic properties, as well as by their tryptic undecapeptide, whereas the hepta‐ and tetradecapeptides, respectively, produced by trypsin are identical.
Photochemische Reaktionen. 43. Mitteilung [1]. UV.‐Bestrahlung von N‐Phenylurethan und N‐Phenylthiourethan
Authors: Belluš D. , Schaffner K. 
Published: December 2004

AbstractUltraviolet irradiation of N‐phenylurethane (I) solutions with wavelength 253,7 nm resulted in the formation o polymeric material, the characteristic pattern of monomeric products associated with Photo‐FRIES‐type rearrangements [→ ethyl anthranilate (II), ethyl p‐aminobenzoate (III)], and accompanying dissociation products [→ aniline (IV)].N‐Phenylthiourethance (V) showed no tendency to undergo Photo‐FRIES‐type rearrangements. Formation of polymeric material and aniline (IV), and in the presence of molecular oxygen, cyclodehydrogenation to the 2‐ethoxy‐benzthiazol (VI) as well as a ready exchange of the sulfure atom in V by oxygen occurred instead.