bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tautomere 3‐Acetyltetramsäurederivate – 1H/13C‐NMR‐Untersuchung
Authors: Zschunke A. , Donau R. , Böttger U. 
Published: January 2005

Tautomeric 3‐Acetyltetramic Acid Derivatives –1H/13C‐n.m.r.‐InvestigationThe molecular structure of 1,5,5‐trimethyl‐3‐acetyltetramic acid (I) and its Schiffbases with ethylendiamin (II) and 1,3‐diaminopropan‐2‐ol (III) is described by an equilibrium of four tautomers. The solvent dependence of the equilibrium is attributed to the strength of the intramolecular hydrogen bond. The higher proton affinity of the Schiff‐bases (II and III) in comparison with the ketone (I) should be responsible for the faster equilibration of II and III.
Substituenteneffekte auf die CC‐Bindungsstärke. IX. Thermolabilität der 2,3‐Di(N,N‐dialkylamino)‐bernsteinsäure‐diethylester
Authors: Schulze Rainer , Beckhaus Hans‐Dieter , Rüchardt Christoph 
Published: January 2005

Substituent Effects on the Strength of CC‐Bonds. IX. Thermolability of 2,3‐Di(N,N‐dialkylamino)‐diethyl‐succinatesThe title compounds meso and D, L 3a–c have been prepared from R,R′NCH2‐COOEt (5), R,R′ = CH3 (a), C2H5 (b) and i‐C3H7 (c), by lithiation followed by oxidation with I2. The thermolysis of 3 above 140°C in solution generates the radicals 1, which could be detected by e.s.r. Kinetic measurements are performed in the presence of a phenylthiol as a scavenger and the activation parameters are determined. – The steric acceleration of the cleavage reaction is separated using the correlation ΔG≠(300°C) = a Ds + b, whereby the strain values Ds = Hs (3) – 2 Hs (1)) are taken from force field calculations. The obtained strain free barrier to dissociation b = 37.4 kcal/mol is considerably lower than the value for the thermolysis reaction of tetraalkyl ethanes (b = 66.2kcal/mol [17]). The decrease of the activation enthalpy (ΔΔH≠ = 35.4kcal/mol) is mainly caused by stabilisation of 1 compared to sec. alkyl radicals; heats of formation of meso‐3a and 5a support this conclusion.Furthermore, the decrease of bond strength in 3 by the two geminal capto‐dative substituents exceeds the sum of the effect of one ester group (ΔΔH≠ = 4kcal/mol [19]) and one amino group (ΔΔH≠ = 9.5kcal/mol, drawn from the thermolysis of 1,2‐(N,N‐Dimethylamino)‐1,2‐diphenyl‐ethane (4) by about 4 kcal/mol.
Synthese 2‐substituierter 1H‐Benz[e][1,4]oxazepin‐5‐one
Authors: Sicker Dieter 
Published: January 2005

Synthesis of 2‐Substituted 1 H‐Benz[e][1,4]oxazepin‐5‐onesAn approach to the hitherto unknown class of 1H‐benz[e][1,4]oxazepin‐5‐ones is given based on reduction and cyclization of appropriate acyclic ortho‐nitro compounds as starting materials. Thus, some 2‐substituted derivatives (3a–i) were synthesized by catalytic hydrogenation of acyl 2‐nitrobenzoates (1a–i) to yield the corresponding anthranilic acid esters (2a–i), which were subsequently cyclized in polyphosphoric acid at elevated temperature. The behaviour of esters 1a–i towards spontaneous intramolecular reductive cyclization is discussed in comparison to that of similar educts leading to sixmembered heterocycles as shown by former results.
Studies on the Oxidation of Phenyl Cycloalkanes by tertiary hydroperoxides
Authors: Pritzkow Wilhelm , Suprun Vladimir Ya. , Voerckel Volkmar 
Published: January 2005

AbstractDuring the thermal decomposition of cumene hydroperoxide at about 125°C in phenyl cycloalkanes as solvents, the solvents are attacked, preferably at the tertiary CH bonds. Up to 70% (with regard to the decomposed hydroperoxide) of oxidation products of the phenyl cycloalkanes are obtained. The main oxidation products are the corresponding 1‐phenyl cycloalkanols, but relatively large amounts of phenyl alkyl ketones with the same number of carbon atoms are also formed, probably via a further oxidation of the 1‐phenyl cycloalkanols.
The synthesis of Pyrido[1,4]thiazinones
Authors: Dunn A. D. , Norrie R. 
Published: January 2005

AbstractBoth 2 and 4 halogenated 3‐aminopyridines react thermally with α‐mercapto esters and amides to afford pyrido[2,3‐b] and pyrido[4,3‐b] [1,4]thiazinones. N‐alkylation and oxidation of the products were investigated.
13C‐NMR‐spektroskopische Untersuchung einfach substituierter Flavyliumsalze
Authors: Gruner M. , Hartmann H. , Czerney P. , Hultzsch R. 
Published: January 2005

13C‐N.M.R. Spektroscopical Studies on Simply Substituted Flavylium‐SaltsOn a series of differently substituted flavyliumsalts 1‐3 their 13C‐NMR‐chemical shifts and their 1J(13CH) coupling constants were recorded and compared with results received by means of semiempirical PPP calculations and using LFE relationships. Both the experimental and theoretical results exhibit concordantly a characteristic alternate electron distribution along the conjugated π‐system of the compounds studies and reveal the distinct influence of donor and acceptor substituents on the electron distribution in both the benzopyrylium and the aryl moiety of the flavylium salts studied.
Electrosynthesis of Conducting Polyanisidine in biphasic media
Authors: Munaff G. A. , Omer Shua'a , Zutshi K. 
Published: January 2005

AbstractThe electrochemical polymerization of anisidine, a soluble conducting polymer has been studied in the two phase media. One phase comprises of a non‐polar solvent containing the monomer and the other a polar medium containing some added electrolytes. The process of electropolymerization has been catalyzed by FeCl3 as the suitable supporting electrolyte. Polyanisidine was obtained in moderate yields with the highest Rp of 0.0296% per hour and a maximum polymerization efficiency of 59.50 × 10−2 mol/faraday. These materials show great potential for applications to areas such as molecular electronic devices, batteries and chemically modified electrodes and sensors. The soluble polymer was analyzed using a variety of common experimental techniques including infrared spectroscopy, proton magnetic resonance spectroscopy and gel permeation chromatography. The conductivity determined by using a classical two‐probe technique displays a value in the range of 10−7 to 2.3 Ω−1 cm−1. The observations and experimental results suggest a cationic polymerization mechanism.
Reaktionen von Dithiocarbamidsäure‐ und Thiokohlensäureestern mit Heterokumulenen
Authors: Dölling Wolfgang , Sperk Katrin , Augustin Manfred 
Published: January 2005

Reactions of Dithiocarbamates and Thiocarbonates with Heterocumulenes3,3‐Bis(alkylthio)‐2‐dialkylaminothiocarbonylthioacrylonitriles 3–5 are obtained by dithiocarboxylation reaction of N,N‐disubstituted S‐cyanomethyl dithiocarbamates 1a‐c in NaH/THF at −15°C followed by alkylation. Treatment of N,N‐dimethyl‐S‐methylthiomethyl dithiocarbamate 6 with CS2/2 n‐BuLi in THF at − 55°C gives N,N‐dimethyl S‐[1,2,2‐tris(alkylthio)‐vinyl]dithiocarbamates 7a‐c. Phenylisothiocyanat reacts with S‐alkoxycarbonylmethyl‐O‐alkyl thiocarbonates 8a, b in the presence of t‐BuOK/dry DMF to yield 4‐subst. 2‐oxo‐3‐phenyl‐1,3‐thiazoline‐5‐carboxylates 11a‐e.
Furylvinylhalogenide. XI. Reaktionen von ß‐(5‐Nitrofur‐2‐yl)‐ß‐chlor‐β‐cyanacrylsäure‐derivaten mit Enaminen
Authors: Vieth Siegfried , Jähnisch Klaus 
Published: January 2005

Furylvinylhalides. XI. Reactions of β‐(5‐Nitrofur‐2‐yl)‐β‐chloro‐α‐cyanoacrylic Acid Derivatives with EnaminesEnamines are vinylated by β‐(5‐nitrofur‐2‐yl)‐β‐chloro‐α‐cyanoacrylic acid derivatives 2 yielding push‐pull‐dienes 3, 4 or 6. Acidic ring closure of 3 leads to pyridin‐2‐ones 7 or chromen‐2‐ones 8, respectively.
Synthese von Pyrazolo[3,4‐b]chinolinen aus 4‐Aroyl‐5‐chlor‐pyrazolen
Authors: Hennig L. , Müller T. , Grosche M. 
Published: January 2005

Synthesis of Pyrazolo[3,4‐b]quinolines from 4‐Aroyl‐5‐chloropyrazolesThe reaction of 4‐aroyl‐5‐chloro‐3‐methyl‐1‐phenyl‐pyrazoles 1 with an excess of 3‐ or 4‐substituted and 3,4‐disubstituted anilines 2 gives pyrazolo [3,4‐b]quinolines 4a‐k. Information about the reaction mechanism was obtained by the isolation of the intermediate product 3e. In some cases it was possible to isolate subsequent products 41‐p. The reaction of 1a with 5‐amino‐3‐methyl‐1‐phenyl‐pyrazole (5) gives a bispyrazolopyridine derivative 6.
On the Reaction of Chloroglyoximes with Aryl Isocyanates
Authors: Witek S. , Czekański T. , Kaczmarek A. 
Published: January 2005

AbstractReaction of chloroglyoxime 1 with aryl isocyanates yielded monocarbamates 3, and chlorooxime functional group was unchanged. The 1,3‐cycloaddition of nitrile N‐oxides generated from 3 to methyl methacrylate gave isoxazole derivatives 5. Compounds 5 were also obtained by carbamoylation of 3‐formyl‐4‐hydro‐5‐methyl‐5‐methoxycarbonylisoxazole oxime 6.The selectivity of chloroglyoxime carbamoylation and the poor reactivity of chlorooxime group is general. Examples, involving another oximes and their halogeno derivatives are given.
The diastereofacial selectivity of the addition of various 1‐metalated 1‐heptynes to substituted cyclopentanecarbaldehydes. – The use of 1‐titanated 1‐heptyne for the construction of the alkyl side chain of Prostaglandins
Authors: Djadchenko Marina A. , Pivnitsky Kasimir K. , Mahrwald Rainer , Schick Hans 
Published: January 2005

AbstractA highly diastereoselective addition of 1‐heptyne to substituted cyclopentanecarbaldehydes is one of the indispensable prerequisites to the construction of the (S)‐3‐hydroxy‐1(E)‐octenyl side chain of prostaglandins by palladium(II)‐catalyzed [3,3]‐sigmatropic rearrangement of allylic acetates. It was found that 1‐titanated 1‐heptynes afford the Cram product at best with a diastereofacial selectivity of 92.5%. The corresponding lithium and magnesium compounds are less diastereoselective.
Thermisch initiierte Addition von Alkanen an Alkene. V. Addition von Cyclohexan an Oct‐1‐en in einer freien Radikalkettenreaktion unter überkritischen Bedingungen
Authors: Metzger Jürgen O. 
Published: January 2005

Thermal Addition of Alkanes to Alkenes. V. Addition of Cyclohexane to 1‐Octene in a Free Radical Chain Reaction at Supercritical Fluid ConditionsAlkanes can be added to alkenes in a thermally initiated free radical chain reaction (“ane reaction”). Kinetic and mechanistic studies on the addition of cyclohexane (1) to 1‐octene (2) (molar ratio = 100:1) at 330−450°C and pressures of up to 300 bar have been performed in a high pressure ‐ high temperature flow apparatus (“HP‐HT” apparatus). The free radical chain is initiated by comproportionation of1and2to give alkyl radicals6and7. Addition of cyclohexyl radical6to alkene2and competing abstraction of an allylic hydrogen atom from2give radicals7aand8, respectively. Subsequent stabilization of the radicals7aand8by hydrogen abstraction from1yields the addition product cyclohexyloctane (3) and isomerized octenes (4), respectively. The relative rate of addition and isomerization can be controlled by pressure and temperature. The regioselectivity of the addition reaction was also measured.
Untersuchungen zur Ringspaltung 4‐(4‐nitrophenylazo)‐substituierter Pyrazolidin‐3,5‐dion‐Derivate
Authors: Waldheim G. , Möhrle H. , Rüdiger S. 
Published: January 2005

Studies on Ring Cleavage of Some 4‐(4‐Nitrophenylazo)‐substituted Pyrazolidine‐3,5‐dione‐DerivativesContinuing to previous investigations the ring cleavage of the pyrazolidine compounds 3 and 7 is studied under the influence of KOH and CH3ONa. Due to the different substitution of atoms of the heterocyclus this reaction was expected to result in at least two isomeric compounds. Actually this assumption was only confirmed for 3. So the reaction of 3 with CH3ONa yields a mixture of four isomers (4a‐4d) with 4a as main product. On the other hand, when 7 is treated with CH3ONa or KOH only one product is formed. With regard to the great structural similarity of the possible isomers, mass spectroscopy proved to be the best test of whether the ring cleavage occurs between C‐3 and C‐4 or C‐4 and C‐5 of the heterocyclus.
Some New Heterocyclic Sulphonates with potential antimicrobial activity
Authors: Habib O. M. O. , Moawad E. B. , Badawy D. S. , Mansour F. A. 
Published: January 2005

Abstract4‐(Phenylhydrazono‐4′‐benzenesulphonato)‐3‐methyl‐2‐pyrazolin‐5‐one (2) was prepared by treating 4‐(4′‐hydroxyphenylhydrazono)‐3‐methyl‐2‐pyrazolin‐5‐one (1) with benzenesulphonyl chloride. Heating 2 with acetic anhydride, chloroacetyl chloride and benzenesulphonyl chloride afforded the N‐acetyl (3), N‐chloroacetyl (4) and O‐benzenesulphonyl (5) derivatives, respectively. 2 reacted with benzenesulphonyl chloride under cooling conditions to give the N‐benzenesulphonyl derivative (6). 2 undergoes Mannich reaction to give the N‐Mannich base (7). Reaction of 2 with formaldehyde in methanol afforded the N‐hydroxymethyl derivative (8) which undergoes condensation with ethyl acetoacetate, ethyl cyanoacetate and malononitrile to give compounds 9, 10 and 11 respectively. The antimicrobial activity of these products against gram‐positive (+ve), gram‐negative (−ve) bacteria and fungi was screened. They showed potential bactericidal activity and some of them exhibited high fungicidal activity.
Reaction of 3H, 6H‐1, 2‐Dithiolo[4,3‐c]1,2‐dithiole‐3, 6‐dithione with primary aliphatic amines
Authors: Fanghänel E. , Laube U. , Kordts B. , Richter A. M. 
Published: January 2005

AbstractThe reaction of 3H,6H‐1,2‐dithiolo[4,3‐c]1,2‐dithiole‐3, 6‐dithione (1) with primary aliphatic amines (8a,b) gives 3H,6H‐3,6‐bisalkylimino‐1,2‐dithiolo[4,3‐c]1,2‐ dithiole (9a,b), 3H,3‐N‐alkylamino‐5‐N‐alkylthiocarbamido‐1, 2‐dithiolium‐4‐thiolate (10a,b) and 3H,3‐N‐alkylimino‐4‐alkylamino‐5‐N‐alkylthiocarbamido‐1,2‐dithiole (11a,b). The compounds 9‐11 can be formed from one another. The compounds 10a,b react with nickel chloride to the stable complexes 14a,b. In basic medium 10 gives the salt of 3H,3N‐alkylthiocarbamido‐1,2‐dithiole‐4‐thiolate 15, which reacts with methyl iodide to 3H,3N‐alkylimino‐5‐N‐alkylthiocarbamido‐4‐methylthio‐1,2‐dithiole 16.
Large‐Scale Synthesis of Mammalian Gonadoliberin without protection of side‐chain functions
Authors: Masiukiewicz Elzbieta , Rzeszotarska Barbara 
Published: January 2005

AbstractA simple, Large‐scale preparation of mammalian gonadoliberin was elaborated using classical solution methods without protecting side‐chain functions. At the final stage, a hexapeptide segment was condensed with the corresponding tetrapeptide and the obtained decapeptide was purified by a single chromatographic procedure on silica gel. The total efficiency of the whole synthesis and the purity of the product amounted to 34% and 98.3%, respectively.
Photochemistry of Acylazides V. Sensitization of decomposition of p‐trimethylsilylbenzoylazide (TSBA)
Authors: Abraham W. , Siegert St. , Buck K. , Csongar Ch. , Helmstreit W. , Grummt U.‐W. 
Published: January 2005

AbstractThe sensitized decomposition of p‐trimethylsilylbenzoylazide by aromatic ketones benzophenone, thioxanthone and 4,4′‐bis(dimethylamino)benzophenone (Michler's ketone) and by diphenylanthracene and pyrene was investigated.Excited benzophenone acts as producer of solvent radicals which attack the TSBA forming the substituted benzamide. Only short chain lengths are observed in the case of cyclohexane as solvent.Michler's ketone, diphenylanthracene and pyrene sensitize the decomposition of TSBA via electron transfer processes forming the substituted phenylisocyanate beside primary and secondary amides. The product ratio is dependent on the solvent properties.Reaction mechanisms are proposed which are founded on time resolved and stationary measurements of transient intermediates and quantum yields.
Produkte der Decarboxylierung photochemisch dargestellter Indencarbonsäure‐Derivate
Authors: Schuster C. , Bendig J. 
Published: January 2005

Products of the Decarboxylation of Photochemically prepared Indenecarboxylic Acid Derivatives.4‐(2‐Diazo‐1‐oxo‐1, 2‐dihydro‐naphthalen‐5‐sulfonyl‐oxy)‐benzophenone (NQD‐BP) was photolyzed to form 4‐(3‐carboxy‐indene‐7‐sulfonyl‐oxy)‐benzophenone (ICA‐BP). This was decarboxylated base‐catalysed in ethanol leading to 4‐(indene‐4‐sulfonyl‐oxy)‐benzophenone (4) and 4‐(indene‐7‐sulfonyl‐oxy)‐benzophenone (5). The indene isomers were separated by means of preparative HPLC and their structure was determined using n.m.r., mass, i.r. and u.v. spectroscopy.
Push‐pull‐Butadiene. XII. Darstellung von Hetrocyclen aus 2,6‐Bis[bis(alkylthio)methylen]cyclohexylidenmalononitrilen
Authors: Peseke K. , Heide G. , Feist H. , Michalik M. 
Published: January 2005

Preperations of Heterocycles by using of 2,6‐Bis[bis(alkylthio)methylene]cyclohexylidenemalononitriles.2,6‐Bis[bis(alkylthio)methylene]cyclohexylidenemalonitriles 1 react with alkanethioles to give 1,3‐bis(alkylthio)‐5‐[bis(alkylthio)methylene]‐5,6, #7,8‐tetrahydro‐isoquinoline‐4‐carbonitriles 2. Treatment of 1 with hydrogen bromide yields 4,6,7,9‐tetrakis(alkylthio)‐2,3‐dihydro‐5,8‐diaza‐phenalenes 3. On the other hand, 1 can be converted with bromine to 6,9‐bis(alkylthio)‐4,7‐dibromo‐2,3‐dihydro‐5,8‐diaza‐phenalenes 5. However, the reaction of 1 and N‐bromosuccinimide afforded 2,6‐bis[bis(alkylthio)methylene]‐3‐bromo‐cyclohexylidenemalononitriles 8.
Synthese von Δ16‐17(Trialkylstannyl)steroiden aus 17‐Ketosteroiden. II
Authors: Schweder Bernd , Uhlig Egon 
Published: January 2005

Syntheses of Δ16‐17(Trialkylstannyl)steroids from 17‐Ketosteroids. II.The oxidation of the hydrazones of 17‐ketosteroids by iodine yields Δ16‐17‐iodosteroids (2, 4). Starting with 2 or 8 (the 3‐tetrahydropyranylether of 4) and lithium(tribu‐tyl)stannate, Δ16‐17(tributylstannyl)steroids (5, 9) are synthesized. The reaction is catalyzed by electronrich complexes of nickel and palladium. In the course of side reactions Δ16‐olefines (6, 10) and the „dimers”︁ 7 and 11, the products of a cross coupling of the Δ16‐17‐iodosteroids, and the Δ16‐17‐tributylstannylsteroids are obtained. The mechanisms of these side reactions and the influence of the solvent (THF, HMPA) are discussed.The tributylstannylsteroids are to be used as intermediates for the syntheses of steroid hormones from the 17‐ketosteroids.
Massenspektroskopie von Thiogibberelllnen
Authors: Voigt D. , Adam G. 
Published: January 2005

Mass Spectroscopy of Thiogibberellins.The results of the positive ion (electron impact, desorption electron impact, low voltage electron impact, positive ion desorption chemical ionization, — EI, DEI, LEI, PIDCI), as well as negative ion (electron attachment — EA) mass spectra of 4 different types of thio gibberellins 6–9 are compared, and the fragmentation pathways are discussed.
Oxdation of Styrene and its analogues with hydrogen peroxide activated by organoseleniun compounds
Authors: Kubicz Elżbieta , Młochowski Jacek , Syper Ldwik 
Published: January 2005

AbstractSome organoselenium compound (1) were tested as catalysts for the oxidation of styrene to phenyloxirane (2) with hydrogen peroxide. Bis(2, 4‐dinitrophenyl) diselenide (12) was found most effective. A convenient method for the synthesis of phenyloxirane and its polysubstituted analogs was elaborated.
Synthesen neuer Chinolon‐Chemotherapeutika. V [5] Methodische Untersuchungen zur Synthese von Chinoloncarbonsäuren
Authors: Jordis Ulrich , Sauter Fritz , Burkart Michael , Henning Hans‐Georg , Gelbin Anke 
Published: January 2005

Synthesis of Novel Quinolone‐Chemotherapeutics. V. Methodical Investigations on the Synthesis of Quinolone Chemotherapeutics.The synthesis of 6, 7‐dihalogen‐N‐ethyl‐4‐oxo‐l, 4‐dihydroquinoline‐3‐carboxylic acids (3a, b) from 3, 4‐dihalogen‐anilines is a three‐step processes: (a) N‐ethylation, (b) reaction with ortho formic ester and Meldrum's acid, (c) intramolecular cyclization. An increase of the total yields in comparison with known methods is mainly connected with the third step. Here the Meldrum's method allows reactions in solution at temperatures ≥ 100°C. With application of special Lewis acids the 6, 7‐dihalogen‐substituted products are formed in relatively high yields (6, 7‐difluoro‐l‐ethyl‐4‐oxo‐1, ‐4‐dihydro‐quinoline‐3‐carboxylic acia (3a): 71%; 7‐chloro‐6‐fluoro‐1 ‐ethyl‐4‐oxo‐1, 4‐dihydro quinoline‐3‐carboxylic acid (3b): 60%) without impurities of the corresponding 5, 6‐dihalogen substituted isomers. Anhydrides (5) of 4‐oxo‐1, 4‐dihydro‐quinolone‐3‐carboxylic acids with dibromo and difluoro‐boric acid were synthesized and shown to facilitate the aromatic nucleophilic substitution. The kinetics of two reactions (5a → 6 and 3b → 7) were determined and relative reaction rates established.
Ultraschall‐induzierte Synthese von Trlmethylsilylessigsäuresilylestern
Authors: Nietzschmann Eckhart , Böge Olaf , Tzschach Alfred 
Published: January 2005

Ultrasound‐induced Synthesis of Trimethylsilylacetic Acid Trimethylsilylester.The reaction of bromoacetic acid trimethylsilylester with zinc in presence of chlorotrimethylsilane is promoted by sono‐waves. The trimethylsilylacetic acid trimethylsilylester could be obtained in high yield. Different products are observed in presence of dichloro dimethylsilane. Mechanical aspects are discussed.
Funktionallsierung von lodprazolen mit D‐Glucopyranose bzw. mit Aminoalkoholen
Authors: Randow H. , Miethchen R. 
Published: January 2005

Functionalisation of Iodopyrazoles with D‐Glucopyranose and with Aminoalcohols, Respectively.3, 4, 5‐Triiodo‐pyrazole (1a) and 3, 4‐diiodo‐5‐methyl‐1 H‐pyrazole (1 b) were silylated with hexamethyldisilazane without isolation of the N‐trimethylsily derivatives and than glucosilated to give the β‐N‐nucleosides 2a and 2b, respectively, with 2, 3, 4, 6‐tetra‐O‐acetyl‐α‐D‐glucopy‐ranosylbromide or ‐fluoride in the presence or absence of SnCl4. The corresponding deacetylated derivatives 3 a–b can be easily obtained by treatment of 2 a–b with sodium methanolate in methanol. Furthermore, 1 a and 1 b as well as 3(5)‐methoxycarbonyl‐4‐iodo‐1‐H‐pyrazole (1 c) were alkylated with methyl bromoacetate‐acetate to form the corresponding pyrazole‐1‐yl‐methylacetates 4 a–c. These compounds could be amidated by short heating with N‐methylglucamine and 1‐amino‐propane‐2, 3‐diol (isoserinol), respectively, in methanol to form the corresponding amides 5 a–c and 6 a–c. The diamide 7 c was prepared bylongtime heating of 4 c with excess isoserinol in n‐propanol.
Reactions of acylium salts with aryl nitriles. A convenient Synthesis of Aryl Substituted bis‐ and tris‐1, 3, 5‐oxadiazinium salts
Authors: Al‐Talib Mahmoud , Tashtoush Hasan , Al‐Omari Mohammad 
Published: January 2005

AbstractBis‐l, 3,5‐oxadiaziniumalkanes (5a–u) and tris‐1, 3, 5‐oxadiaziniumbenzene (6a–d) were prepared from the reaction of diacylium and triacylium salts with aryl nitrites, respectively. All new compounds are fully characterized by spectroscopic methods and elemental analysis.
Zur Reaktion von atomarem Wasserstoff mit 1‐Olefinen
Authors: Gebhardt J. , Scherzer K. 
Published: January 2005

About the Reaction of Atomic Hydrogen with 1‐Olefines.Chemical activated reaction paths of the C2C8‐l‐olefines, initiated by atomic hydrogen, have been studied using an isothermal flow‐system (298 K, 130 Pa) with electrical discharge. In the reaction mixtures homologeous series of 1‐olefines and n‐alkanes were found which are identical with those of cycloolefine systems described previously [1, 2]. The reactions of the 1‐olefines are analysed and discussed in detail and compared to the cycloolefine reactions.
On the Spin Trapping off Sulfur Dioxide Anion‐Radicals (.SO2−) by nitrones
Authors: Rehorek Detlef , Dubose Coit M. , Janzen Edward G. 
Published: January 2005

Abstract.SO2− radicals react with nitrones to form the anion of the corresponding spin adduct. Addition of mild oxidants generates the spin adduct of .SO2−, the e.p.r. spectrum of which exhibits additional hyperfine splitting.