bluuebunny/crossref_metadata_2025_split huggingface dataset:
Säurekatalysierte Umsetzungen von Aromaten mit Alkanen und Cycloalkanen. IX. Alkylierungen mit 2,2,4‐Trimethylpentan (Isooctan)
Authors: Kröger Carl‐Friedrich , Miethchen Ralf , Mann Hanna , Hoffmann Klaus , Wiechert Kurt 
Published: December 2004

Acid‐catalyzed Reactions of Aromatic Hydrocarbons with Alkanes and Cycloalkanes. IX. Alkylations with 2,2,4‐Trimethylpentane (Isooctane)The non‐conventional alkylation of benzene, toluene, ethyl‐ and isopropylbenzene, fluoro‐ and chlorobenzene with 2,2,4‐trimethylpentane in the presence of acid catalysts is described. The composition of the rather complex reaction mixtures is determined by gas‐liquid chromatography and mass spectrometry, tert. butylarenes being the main products beside alkylsubstituted indanes and tetralines. Their formation is interpreted as a competition between fragmentation and isomerization of the alkylating agent. By use of trifluoromethanesulfonic acid or combinations of catalysts from HF or HSO3F with variant metallic fluorides at lower temperatures the selectivity of the reaction may be partially raised.
1H‐ und 13C‐NMR‐spektroskopische Messungen und MO‐Berechnungen zur π‐Elektronenstruktur von p,p′‐disubstituierten trans‐Stilbenen und substituierten trans‐β‐Styryl‐methyl‐sulfonen
Authors: Spilski W. , Grohmann I. , Köppel H. , Wegener W. , Gloyna D. , Schleinitz K.‐D. , Radeglia R. 
Published: December 2004

1H and 13C n.m.r. Spectroscopical Measurements and HMO‐π‐Calculations to the π‐Electronic Structure of p,p′‐Disubstituted trans‐Stilbenes and Substituted trans‐β‐Styryl‐methyl‐SulfonesThe 1H and 13C n.m.r. spectra have been measured for a series of donator‐acceptor‐disubstituted trans‐stilbenes 1 and monosubstituted β‐styryl‐methyl‐sulfones 2. The 13C n.m.r.‐signals have been identified by comparison with empirical calculated chemical shifts and quantum chemical determined HMO‐π‐electrons densities. The influence of substitutents to the experimental chemical shifts are discussed in detail. For 1 and 2 exist linear correlations between chemical shifts and HAMMETT values, and π‐electron densities, respectively.
Polarographic Behaviour of 2‐Benzoyl‐3‐thianaphthenone
Authors: Fahmy H. M. , Abdul‐Malik N. F. , Barsoum B. N. 
Published: December 2004

Polarographisches Verhalten von 2‐Benzoyl‐3‐thionaphthenonDas polarographische Verhalten des 2‐Benzoyl‐3‐thionaphthenons (I) in wäßriger, ethanolischer Pufferlösung zeigt bei Veränderung des pH‐Wertes, daß die Carbonylgruppe des heterozyklischen Teiles im sauren und neutralen Medium durch einen Zweielektronenprozeß reduziert wird.Im stark basischen Bereich ist ein stabilisiertes Enolat die reduzierbare Form der Verbindung I.
Reactions of Dimethyl‐2,5‐dihydroxy‐3,6‐dihydroterephthalate with Nucleophilic Nitrogen Compounds
Authors: El‐Rayyes N. R. , Al‐Hajjar F. H. 
Published: December 2004

Reaktionen von Dimethyl‐2,5‐dihydroxy‐3,6‐dihydroterephthalat mit nucleophilen StickstoffverbindungenDimethyl‐2,5‐dihydroxy‐3,6‐dihydroterephthalat 1 wird durch basenkatalysierte Kondensation von Dimethylsuccinat dargestellt. Reaktionen von 1 mit einigen nucleophilen Stickstoffverbindungen werden untersucht.
Spektrometrische Untersuchungen an N,N′‐disubstituierten Dithiomalonsäurediamiden und ihren Kobalt(II)‐Komplexen
Authors: Schleinitz K. D. , Rose G. , Kunzek H. , Köppel H. 
Published: December 2004

AbstractDie spektrometrischen Untersuchungen in Lösungen belegen eindeutig die dominie‐rende Rolle der Dithionform bei den Dithiomalonamiden, fur die Enthiol‐thion‐Form gibt es nur geringfügige, nicht eindeutige Hinweise bei einigen IR‐Festkörperspektren.
Steric Effects in the STOBBE Condensation of 3,4‐Disubstituted Acetophenones with Dimethyl Methylsuccinate
Authors: El‐Newaihy M. F. , Enayat E. I. , Salem M. R. , El‐Khamry A. A. 
Published: December 2004

Sterische Effekte in der STOBBE‐Kondensation von 3,4‐disubstituierten Acetophenonen mit Dimethyl‐methylsuccinatDie Kondensation von 3,4‐Dimethyl‐, 3,4‐Dimethoxy‐ und 3,4‐Dichloracetophenon mit Dimethylsuccinat in Gegenwart von Kalium‐t‐butylat lieferte in jedem Fall ölige Gemische der stereoisomeren Halbester 1 und 2. Während die (E)‐Halbester 1 zu den entsprechenden 1‐Acetoxy‐3‐nahpthoesäureestern 5 cyclisiert werden konnten, ergaben die (Z)‐Halbester 2 unter den gleichen Bedingungen die entsprechenden 3‐Oxo‐inden‐2‐(α‐subst.)‐essigsäuren 7.Das Isomerenverhältnis wird mit sterischen Wechselwirkungen in den γ‐Lacton‐Zwischenprodukten 8 erklärt.
Die Reaktion von α,β‐Dihalogen‐propionitrilen mit monosubstituierten Hydrazinen ‐ einfache Synthese 1‐substituierter 3‐ bzw. 5‐Amino‐pyrazole
Authors: Dorn Helmut , Ozegowski Rüdiger 
Published: December 2004

The Reaction of α,β‐Dihalogeno‐propionitriles with Monosubstituted Hydrazines — A Simple Synthesis of 1‐Substituted 3‐ or 5‐Amino‐pyrazolesIn methanol hydrazines 3, and α,β‐dihalogeno‐propionitriles 1, 2 even at 0°C irreversibly yield 3 · HX, and α‐halogenoacrylonitriles 4, 5 (A1). Fast addition of alkyl‐ and aralkyl‐ hydrazines 3 to 4, 5 (C) gives 1‐substituted 1‐(2′‐halogeno‐2′‐cyan‐ethyl)‐hydrazines 6, the addition of arylhydrazines 3 to 4, 5 (D) 1‐aryl‐2‐(2′‐halogeno‐2′‐cyan‐ethyl)‐hydrazines 8. In methanol 6 spontaneously cyclise (E) to hydrogen halides 7 · HX of 1‐alkyl‐ and 1‐aralkyl‐3‐amino‐pyrazoles, 8 with 2 moles of acids (F) to salts 10 · 2HY of 1‐aryl‐4‐halogeno‐5‐imino‐pyrazolidines, and the free 10 spontaneously (G) to hydrogen halides 9 · HX of 1‐aryl‐5‐amino‐pyrazoles. Mechanisms (A1), (C), (D), (E), (F), and (G) are proved by t.l.c., 1H‐n.m.r., and isolation of intermediates, the structures of 7 resp. 9, using the significant 1H‐n.m.r.‐parameter Δ. Simple general syntheses are described for 3‐amino‐pyrazoles 7 (R = H, alkyl, aralkyl) or 5‐amino‐pyrazoles 9 (R = aryl) starting with α,β‐dihalogeno‐propionitriles 1, 2, and for α‐bromo‐acrylonitrile 5.
Synthesis of Some Ketimine Derivatives of Silicon(IV)
Authors: Singh R. V. , Tandon J. P. 
Published: December 2004

Synthese einiger Ketiminderivate des vierwertigen SiliciumsA brief survey of the literature revealed that so far very few silicon Schiff base complexes have been reported [1, 2]. Although, the reactions of metal alkoxides of a number of metals of III, IV, V and VI groups of the periodic table with Schiff bases have been found to be facile and straight forward, the reactions of alkoxy silanes with azomethines as well as other nitrogen donor ligands have been reported to be quite slow [3]. However, silicon tetraacetate has been found to be a suitable starting material for such reactions and this has been used in the present studies as well.In previous communications from these laboratories, the reactions with bifunctional tridentate or tetradentate Schiff bases have been reported [4, 5]. The present paper describes the synthesis and properties of silicon complexes with monofunctional bidentate Schiff bases of the type 1.
Beiträge zum Reaktionsverhalten von Derivaten der Imidodithiokohlensäure. II [1]. 7‐Hydroxythiazolo[4,5‐b]pyridone‐(5)
Authors: Walek W. , Götzschel K. 
Published: December 2004

Contributions to the Reaction Behaviour of Derivatives of Imidodithiocarbonic Acid. II. 7‐Hydroxythiazolo[4,5‐b]pyrid‐5‐onesDerivatives of cyanimidocarbonic acid 1 react with ethyl γ‐bromoacetoacetate to ethyl thiazolylacetates 2 which are converted into 7‐hydroxythiazolo[4,5‐b]pyrid‐5‐ones 3 by acid or base catalyzed cyclisation. These compounds can be alkylated as well as acylated. The 7‐hydroxy group is exchangeable for chlorine. Furthermore in position 6 electrophilic sulfonation can take place.
Polarographische Untersuchungen an 1,3‐Thiazinthionen
Authors: Rüttinger Hans‐Hermann , Matschiner Hermann , Schroth Werner 
Published: December 2004

Polarographic Investigations of 1,3‐Thiazinthiones1,3‐Thiazine‐6‐thiones are stepwise reduced in aprotic media to the corresponding radical anions and dianions. In the case of the 2,4‐diphenyl derivative (1a) the radical anion is stable in dimethylformamide, whereas the dianion reacts further to yield the bithiazinylidene (4) among other products.The effect of substituents on the reduction potentials is discussed.
Untersuchungen zur Sulfochlorierung von Paraffinen. V. Kinetische Untersuchungen über die Sulfochlorierung definierter Alkansulfochloride
Authors: Berthold H. , Hünecke H. H. , Burghardt D. , Hampel M. , Helwig D. , Kopinke F. D. , Krebes S. , Niegel H. , Pritzkow W. , Ziegler J. , Zipfel J. 
Published: December 2004

Studies on Sulphochlorination of Paraffins. V. Kinetic Studies on the Sulphochlorination of Pure AlkanesulphochloridesThe mixtures of disulphochlorides formed by sulphochlorination of 1‐alkanesulphochlorides C4C9 may be analyzed gaschromatographically after transformation into the corresponding dimethylamides. The individual peaks could be identified in some cases with the aid of pure isomeric disulphochlorides, in other cases they were identified by analogy. The mixtures formed by sulphochlorination of the isomeric heptane sulphochlorides also could be analyzed after transformation into the dimethylamides; the identification of all peaks was possible by comparison of the mixtures obtained from different heptane sulphochlorides.For the alkane sulphochlorides studied the relative rates of sulphochlorination (with reference to n‐octane) were determined, and therefore the relative reaction rates of the individual CH‐bonds with reference to one primary CH‐bond of n‐octane could be calculated.The results show a geminal or vicinal disubstitution not to take place in noticeable amount. In position 3 or in greater distance the influence of the sulphochloride group on the reactivity of the CH‐bonds is not significant.
Photokatalytische Systeme. XXI. Zum Mechanismus der Photoreduktion von Kaliumchromat in Alkoholen
Authors: Rehorek Detlef , Wagener Roland 
Published: December 2004

Photocatalytic Systems. XXI. On the Mechanism of the Photoreduction of Potassium Chromate in AlcoholsThe photolysis of crown ether complexes of potassium chromate in several alcohols has been investigated by e.s.r.‐spectroscopy. Two different relatively long‐lived Cr(V) intermediates formed by different reaction pathways have been observed. Radicalic oxidation products of the alcohols (alkoxy and hydroxyalkyl radicals as well as fragmentation products) and of the crown ether have been detected by spin trapping.
Oxidative Kupplung CH‐acider Verbindungen mit p‐Phenylendiaminen. III [1]. Reaktivität 4‐substituierter 3‐Methyl‐1‐phenyl‐pyrazolin‐5‐one gegenüber N,N‐Diethylchinondiimin
Authors: Wilde H. , Mann G. , Burkhardt U. , Weber G. , Labus D. , Schindler W. 
Published: December 2004

Oxidative Coupling of CH‐acid Compounds with p‐Phenylene Diamines. III. Reactivity of 4‐Substituted 3‐Methyl‐1‐phenyl‐pyrazolin‐5‐ones with N,N‐Diethyl‐quinone‐(1,4)‐diimineSubstitution products 2–28 of 3‐methyl‐1‐phenyl‐pyrazolin‐5‐one 1, with a wide variety of substituents in the 4‐position, were synthesized. Most of these compounds react with N,N‐diethyl‐quinone‐(1,4)‐diimine by elimination of the substituent giving the same azomethine dye as that formed by oxidative coupling of the 4‐unsubstituted compound. A study of the influence of side reactions by measurement of dye yields has been undertaken.
Zum Zerfall von tert.‐Butylhydroperoxid an Zeolithen
Authors: Bergk K.‐H. , Wolf F. , Walter B. 
Published: December 2004

Decomposition of tert.‐Butyl Hydroperoxide by ZeolitesZeolites catalyze the decomposition of tert.‐butyl hydroperoxide in the liquid‐phase. Structure, cation and degree of ion‐exchange influence the catalytic activity of the zeolithe. The highest rates of the decomposition were obtained by means of zeolites containing transition metal cations. It is possible to use the decomposition of tert.‐butyl hydroperoxide, catalyzed by zeolites, for the epoxidation of olefins.
Die Reaktion von E‐ß‐Nitro‐styrolen mit Pyrazolidon‐(3)‐azomethiniminen – eine nicht‐cisoide 1,3‐dipolare Cycloaddition
Authors: Helmut Dorn Habil , Ozegowski Rüdiger , Gründemann Egon 
Published: December 2004

The Reaction of E‐ß‐Nitro‐styrenes with 3‐Pyrazolidone‐azomethinimines – a Non‐cisoid 1,3‐Dipolar CycloadditionNormal flipping at both ring‐N‐atoms postulated, the thermal addition of E‐β‐nitro‐5a or E‐(4‐chloro‐β‐nitro)‐styrene 5b to 3‐pyrazolidone‐azomethinimine‐1,3‐dipoles 4a or 4b formally can yield 8 isomeric pairs of enantiomers, 4 of which are “permitted”(cisoid) and 4 of which are “forbidden” according to the concerted [π4s + π2s]‐mechanism. If the addition of 5 to 4 is regiospecific, 2 “permitted”(cisoid) (1 and 6) and 2 “forbidden”(3 and 10) isomers are conceivable. From pure 5a and 4a we regiospecifically got 1ref,3trans‐diphenyl‐2cis‐nitro‐6a (75%) and 1ref,3trans‐diphenyl‐2trans‐nitro‐5‐oxo‐perhydropyrazolo[1,2‐a]pyrazol 10a (25%), from 5b and 4b the corresponding bis(4‐chloro‐phenyl)‐isomers 6b and 10b. The sodium salts 8a, b, gained from 6a, b and 10a, b, are identical. With H⊕ (D⊕) in water (D2O) 8a, b give 6a, b (2‐deutero‐6a, b = 7a, b). The 1H‐n.m.r. spectra of 6a, b, 7a, b, 8a, b, 10a, b, and of the 2‐amino‐isomers 11a/12a, corresponding to 6a/10a, are discussed.For the first time products of a non‐cisoid 1,3‐dipolar cycloaddition (10a, b) were isolated. In the discussion (E ⇌ Z)‐isomerization of 5a, and conceivable mechanisms of isomerizations 6a → 10a are excluded. Theoretical consequences are suggested.
Vilsmeier‐Reaktion an Dimedon
Authors: Pulst Manfred , Hollborn Bernd , Weissenfels Manfred 
Published: December 2004

Vilsmeier‐Reaction on Dimedone.The Vilsmeier‐reaction has been studied in detail for a special cyclic β‐diketone, dimedone. It was shown, that the first step in this reaction is the formation of the corresponding β‐chlorovinylketone. 3‐Chloro‐5,5‐dimethyl‐cyclohex‐2‐en‐one‐(1) 2, 2,4‐dichloro‐6,6‐dimethyl‐1‐formyl‐cyclohexa‐1,3‐diene 3 und 2,4‐dichloro‐1,5‐diformyl‐6,6‐dimethyl‐cyclohexa‐1,4‐diene 4 were isolated in equal parts. The symmetrical enolether 6 was identified as condensation‐product of the diformylated compound 5.
Reactions of Acetylenic Esters with Cyclic Ketones and Substituted Acetophenones
Authors: Shandala Mowafak Y. , Al‐Khashab Abdel‐Elah Y. , Al‐Jobour Nazar H. , Al‐Arab Mohammad M. 
Published: December 2004

Reaktionen von Acetylenestern mit cyclischen Ketonen und substituierten AcetophenonenDie Kondensation von substituierten Phenylpropiolsäureestern mit cyclischen Ketonen führt zu polycyclischen Pyronen. Die Kombination spektroskopischer Methoden zeigt, daß Cyclopentanon zu 4‐Pyronen (I), Cyclohexanon, Cycloheptanon, Cyclooctanon dagegen zu 2‐Pyronen (IIa–f) reagiert.Die Kondensation von Ethylarylpropiolaten mit p‐Piperazino, p‐Piperidino, p(4‐Methylpiperazino) und p‐Morpholinoacetophenonen ergibt die p‐(4‐Arylpropiolylpiperazino) acetophenone (IIIa–d), 2‐(p‐Piperidinophenyl)‐6‐aryl‐4‐pyrone (IVa–c), 2‐(p‐4‐Methylpiperazino‐phenyl)‐6‐aryl‐4‐pyrone (Va–c) und 2‐(p‐Morpholinophenyl)‐6‐aryl‐4‐pyrone (VIa—d). Die Acetylen‐β‐diketone (VII) erhält man aus Ethyl‐p‐tolylpropiolat mit p‐Piperidinoacetophenon.
Sensibilisierte Photooxidation von Butadien‐(1,3)‐sultamen‐(1,4)
Authors: Fanghänel E. , Do Nascimento E. A. , Radeglia L. R. , Lutze G. , Bode B. 
Published: December 2004

Sensitized Photooxidation of Butadiene‐(1,3)‐sultames‐(1,4)The sensitized photooxidation of the butadiene‐sultames 1a–d gives 2‐aryl‐3,5‐dimethyl‐5‐hydroxy‐1,1,6‐trioxo‐5,6‐dihydro‐2H‐1,2‐thiazines 2a–d in yields of 60%. The compounds 2a–d are instable against bases and acids. With triethylamine the N‐aryl‐5‐hydroxypyrrolin‐2‐ones 5a–d are formed by SO2‐extrusion. With alkali 2b reacts to 5b and cis‐β‐acetyl‐methacrylic acid 4. 1H‐ and 13C‐n.m.r. spectroscopic data of 2 and 5 are given.
β‐Oxosulfenylchloride – Eine neue 5,6‐Dihydro‐4H‐1,2,4‐thiadiazin‐Synthese
Authors: Mühlstädt M. , Meinhold H. , Seele T. 
Published: December 2004

β‐Oxosulfenyl Chlorides — A New Synthesis of 5,6‐Dihydro‐4H‐1,2,4‐thiadiazinsAmidines and isothioureas react with β‐oxosulfenylchlorides, e.g. 2‐formyl propane‐2‐sulfenylchloride, yielding 5,6‐dihydro‐4H‐1,2,4‐thiadiazins.
Zur Reaktion von o‐Halogenbenzylcyaniden mit Schwefelkohlenstoff und Phenylisothiocyanat
Authors: Rudorf W.‐D. , Schierhorn M. A. , Augustin M. 
Published: December 2004

Reaction of o‐Halobenzyl Cyanides with Carbon Disulfide and Phenyl IsothiocyanateStarting from o‐halobenzyl cyanides 1 and carbon disulfide in the presence of sodium hydride dithiolates 3 are prepared, which are not isolated. Alkylation under cooling gives ketene S, S‐acetals 4, while on heating at 100°C benzo[b]thiophenes 6 are obtained. Nitrile cyclisation yields thieno[2, 3‐b]benzothiophene 7. Reaction of 1 with phenyl isothiocyanate/sodium hydride and subsequent alkylation leads to the ketene S, N‐acetals 13 und to the thiazolidines 15.
MO‐LCAO‐calculations on polymethines. XII. On the Intensity of Intramolecular Charge‐Transfer Absorption Bands
Authors: Fabian J. 
Published: December 2004

MO‐LCAO‐Berechnungen an Polymethinen. XII. Zur Intensität intramolekularer Charge‐Transfer‐AbsorptionsbandenEinige meropolymethinische und zwitterionische Farbstoffe werden aus zwei molekularen Teilstrukturen zusammengesetzt gedacht, die entweder Donator‐ oder Acceptor‐eigenschaften besitzen. In diesem Bild rührt die Farbbande von einem Charge‐Transfer‐Übergang her. Hohe Übergangswahrscheinlichkeiten treten auf, wenn die Charge‐Transfer‐Konfigurationen mit der No‐Bond‐Grundzustandskonfiguration überlappen. Aufgrund von Überlegungen, die von den Grenzorbitalen der Fragmente ausgehen, lassen sich Strukturen angeben, welche bei langen Wellenlängen und mit hoher Intensität absorbieren. Die Schlußfolgerungen stehen in Übereinstimmung mit numerischen Ergebnissen von PPP‐Konfigurationsanalysen und LHM‐‘Molecules in Molecule’‐Berechnungen.
Selektiv S‐geschützte Cysteinpeptide. IV. Zur Synthese von Cysteinpeptiden unter Verwendung der S‐Ethylthio‐Schutzgruppe. II
Authors: Kunzek Herbert , Rose Karl‐Berthold , Graetz Solveyg , Nesener Eckehard 
Published: December 2004

Selectively S‐Protected Cysteine Peptides. IVSynthesis of Cysteine Peptides Using the S‐Ethylthio Protecting Group. IIStudying the problems of the selective sulphur protection in cysteine peptides, a model octapeptide from the sheep insulin A‐chain was prepared by conventional synthesis using the S‐ethylthio and the S‐diphenylmethyl group. As consequence of the small acid stability of S‐ethylthio protected cysteine peptides, the corresponding compounds were synthesized using the strong acid labile 2‐(p‐biphenylyl)‐iso‐propyloxycarbonyl(Bpoc) and the 2‐phenyl‐iso‐propyloxycarbonyl(Ppoc) amino protecting group, respectively. Therefore a new synthesis of N‐protected S‐alkylthio cysteine derivatives 5 via N‐unprotected compounds 4 was developed starting from S‐guanylthio cysteine dihydrochloride 3. The synthesis of the octapeptide Boc‐Cys(SEt)‐Cys(Dpm)‐Ala‐Gly‐Val‐Cys(SEt)‐Ala‐Leu‐OBut 1 was carried out with the fragments Boc‐Cys(SEt)‐Cys(Dpm)‐Ala‐Gly‐OH and TFA · H‐Val‐Cys(SEt)‐Ala‐Leu‐OBut 12 by means of the DCCI/HOOBt coupling method. 12 was synthetisized step by step from the carboxyterminal end. The S‐ethylthio group was completely stable during all synthetic steps including the deprotection of the Nα‐Bpoc and Nα‐Ppoc group, respectively. The cyclocystine octapeptide 2, Boc‐Cys‐Cys(Dpm)‐Ala‐Gly‐Val‐Cys‐Ala‐Leu‐OBut, was produced by treatment of 1 with an excess of HSCH2CH2OH followed by oxidation with ICH2CH2I.
Synthesis of Phosphonic Analogues of Morphactines
Authors: Gancarz Roman , Wieczorek Jan S. 
Published: December 2004

Zur Synthese von Phosphono‐Analoga des Morphaktins9‐Aminofluorenphosphonsäuren (Morphaktine) entstehen durch Addition von Diethylphosphit an 9‐Imino‐fluorenderivate. Die primär erhaltenen Ester werden zu den korrespondierenden Säuren hydrolysiert, eine Reihe der Aminophosphonsäuren zerfallen unter den Bedingungen der Hydrolyse in 9‐Fluorenonderivate und die entsprechenden Amine.
Untersuchungen zur Sulfochlorierung von Paraffinen. VI. Untersuchungen über die Sulfochlorierung von definierten Alkylchloriden
Authors: Helwig D. , Pritzkow W. , Radeglia R. , Schmidt‐Renner W. , Ziegler J. 
Published: December 2004

Studies on Sulphochlorination of Paraffins. VI. Studies on the Sulphochlorination of Individual Alkyl ChloridesThe products of sulphochlorination of individual C2–C7 alkyl chlorides were studied by means of 1H‐ and 13C‐n.m.r. spectroscopy. Gaschromatographic determination of the isomers formed was possible after the reaction of the chloroalkane sulphochloride mixture with dimethyl amine in ether. In no case geminal chloroalkane sulphochlorides were formed. Vicinal chlorosulphochlorides are formed, but substitution in greater distance from the chlorine is preferred if possible. Thus higher alkyl chlorides yield only very little amounts of vicinal chloroalkane sulphochlorides. The relative rates of sulphochlorination of alkyl chlorides were determined by competitive reactions.
Interaction of Trivalent Iron with Some Cannabinoids and their related compounds
Authors: Mobarak Z. , Aly H. , Bieniek D. 
Published: December 2004

Wechselwirkung zwischen Eisen(III)‐Ionen und einigen Cannabinoiden und verwandten VerbindungenDie Reaktion zwischen Orcinol, Olivetol oder Cannabidiol und dreiwertigem Eisen wurde spektroskopisch untersucht. Zwischen Eisen(III)‐Ionen und Orcinol bzw. Olivetol bilden sich in Methanol 1:3 Komplexe (Dissoziationskonstanten 1,5 × 10−5 bzw. 2,5 × 10−7). Keine Wechselwirkung konnte unter analogen Bedingungen zwischen Fe3+‐ionen und Cannabidiol beobachtet werden.
Formation of 4,4‐Dialkyl‐2‐oxo‐morpholinium Chlorides. II
Authors: Witek Stanisław , Os̀wieşcimska Małgorzata 
Published: December 2004

Zur Bildung von 4,4‐Dialkyl‐2‐oxo‐morpholinium‐chloridenDialkylaminoethanole 2 reagieren mit Chloracetaten 1 zu den N,N‐Dialkyl‐2‐oxo‐morpholinium‐salzen 6. Es wird gezeigt, daß die Reaktion zweistufig und über die Ester 3–5 verläuft, welche zu den Salzen 6 cyclisieren. Das Zwischenprodukt 5a wurde isoliert, seine Struktur aufgeklärt und ein Reaktionsmechanismus vorgeschlagen.2‐Oxo‐morpholiniumsalze 6 hydrolysieren in wäßriger Lösung zu den entsprechenden Betainen 7. Der Hydrolysegrad wurde bestimmt. Die Betaine 7 können in umgekehrter Weise zu den 2‐Oxomorpholinium‐Derivaten 6 cyclisieren.
Synthese neuer Thieno [2′,3′; 4,5]imidazo[1,2‐a]pyridiniumsalze
Authors: Fischer E. , Rembarz G. , Wollin K.‐M. 
Published: December 2004

Syntheses of New Salts of Thieno[2′,3′;4,5]imidazo[1,2‐a]pyridinesMesomeric 1‐[2‐amino‐1‐cyano‐2‐thio‐]ethene‐pyridinium ylides 1 are cyclizized to imidazo[1,2‐a]pyridinium ylides 2 in the presence of HgO. S‐alkylation of 2 leads to derivatives of 1‐R1‐2‐thio‐3‐cyano‐imidazo[1,2‐a]pyridinium halides 3 or 4. Alkylation products from 2 with α‐haloketones are cyclizized to thieno[2′,3′ 4,5]imidazo[1,2‐a]pyridinium salts 5.
1,2,3‐Triazabutadiene. XI. Untersuchungen zur iod‐sensibilisierten Fotoisomerisierung von 1‐Aryl‐3‐(3‐methyl‐benzthiazolin‐2‐yliden) triazenen
Authors: Ortmann W. , Fanghänel E. 
Published: December 2004

1,2,3‐Triazabutadienes. XI. Investigation of the Iodine‐induced Photoisomerization of 1‐Aryl‐3‐(3‐methyl‐benzthiazolin‐2‐yliden) triazenescis‐1‐Aryl‐3‐(3‐methyl‐benzthiazolin‐2‐yliden)triazenes isomerize induced photo‐chemically by iodine to the trans‐isomer. The wavelength of the used irradiation light was 546 nm so that only I2 absorb. The dependence of the quantum yields on the concentration of the cis‐isomer and on the intensity of the irradiation light was investigated. The influence of the light intensity on the quantum yields shows, that the primary step is the dissoziation of I2‐molecules to I·‐ radicals, which induce the isomerization.
Über die Synthese einiger Antipyrylmethine. I. Asymmetrische Antipyrylmethine
Authors: Kokkinos Konst. , Markopoulos Chr. 
Published: December 2004

Synthesis of Some Antipyryl Methines. I. Asymmetrical Antipyryl MethinesA new series of asymmetrical antipyryl dimethine cyanines 2–7 was synthesized, starting with antipyrine aldehyde 1 and methylcarbenium salts, and the color change of the dyes was investigated as a function of the carbene moiety.