bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recherches sur la formation et la transformation des esters LXXIX [1]. Sur la réaction de l′isothiocyanate d′o‐méthoxycarbonyl‐phényle avec divers acides et l′acide sérinephosphorique
Authors: Cherbuliez Emile , Espejo O. , Willhalm B. , Rabinowitz J. 
Published: December 2004

AbstractAmino acids devoid of «leaving groups» on their β carbon atom (neither OH: serine, nor SH: cysteine) react with o‐methoxycarbonyl‐phenyl isothiocyanate (I) in the presence of one equivalent of NaOH, in water‐dioxane or in ethanol, to yield the corresponding hydroquinazolinone derivatives II which were isolated as free acids.When treated with CH3COOH + conc. HCl the hydroquinazolinone resulting from the reaction of L‐serine with I undergoes a nucleophilic attack of the carbon bearing the leaving group OH by a lone pair of electrons of S; this attack produces the formation of an additional thiazolidine ring, yielding the thiazoloquinazolinone derivative (−)‐III. In an analogous reaction DL‐serine phosphoric acid treated with I at pH 8–9 yields the corresponding substituted hydroquinazolinone which, boiled in 1N hydrochloric acid, undergoes ring closure to (±)‐III by the same mechanism as the serine derivative (leaving group: OPO3H2).L‐Cysteine reacted with 2 equiv. of I and then treated with CH3COOH + conc. HCl gives two products: (−)‐III produced by the same mechanism as for serine (leaving group: SH), and the quinazolinone derivative IV where the SH group is also thiocarbamoylated.
Die Reaktion von halogenierten s‐Triazinen mit Cyclopentadienylnatrium 3. Mitteilung
Authors: Neuenschwander M. , Schaltegger H. 
Published: December 2004

AbstractBei der Reaktion von äquimolaren Mengen 2‐Chlor‐4, 6‐dimethoxy‐s‐triazin und Cyclopentadienylnatrium entsteht ein disubstituiertes Cyclopentadien, welches auf Grund der spektroskopischen Daten als 4, 6‐Dimethoxy‐2‐[2′‐(4″, 6″‐dimethoxy‐2″‐s‐triazinyl)‐cyclopentadienyliden]‐1, 2‐dihydro‐striazin (II) betrachtet wird.
Struktur der Pachybiose und Asclepobiose. Desoxyzucker, 44. Mitteilung
Authors: Allgeier H. 
Published: December 2004

AbstractPachybiose (1) is shown to be 4‐O‐(3‐O‐methyl‐6‐deoxy‐β‐D‐allopyranosyl)‐D‐oleandrose and asclepobiose (14) 4‐O‐(3‐O‐methyl‐6‐deoxy‐β‐D‐allopyranosyl)‐D‐cymarose.
Herstellung von 1,4‐Dichlornaphtalin aus 1,4‐Dichlor‐5‐nitro‐naphtalin
Authors: Kniel P. 
Published: December 2004

AbstractTreatment of 1,4‐dichloro‐5‐nitro‐naphthalene with sodium borohydride in dimethylformamide yielded 1,4‐dichloronaphthalene (80–83%).
Über En‐Synthesen mit Singulett‐Sauerstoff Die Farbstoff‐sensibilisierte Photooxygenierung von (−)‐Caryophyllen und (−)‐iso‐Caryophyllen und die Stereochemie der dargestellten Caryophylladienole
Authors: Schulte‐Elte K. H. , Ohloff G. 
Published: December 2004

AbstractThe dye‐sensitized photooxygenation leads in the case of (−)‐caryophyllene (1) to 4 allylhydroperoxides, and with (−)‐iso‐caryophyllene (2) additionally to 2 tertiary compounds of this kind. The stereochemistry of the isolated 6 caryophylladienols derivatives 6–11 is elucidated. By that way an interpretation of the reaction mechanism is possible.
Sulfonylgruppenhaltige Liganden in Chromkomplexen von drei‐ und sechszähnigen Mono‐ bzw. Disazofarbstoffen aus 4,5‐Diphenylimidazol als Kupplungskomponente
Authors: Schetty G. 
Published: December 2004

Abstracto‐Aminobenzenesulfonic acid → 4,5‐diphenylimidazole [DPI] forms an unstable 1:2‐chromium complex, accordingly the DREW‐PFITZNER arrangement is indicated. o‐Aminobenzenesulfonic acid ethylamide → DPI yields no chromium complex, whilst 1,3‐di‐(2‐aminobenzolsulfonamido)‐propane → DPI forms an unstable pentacyclic chromium complex.
Das Protonenresonanzspektrum von orientiertem Furan in nematisch‐kristallinflüssiger Lösung
Authors: Diehl P. , Khetrapal C. L. , Kellerhals H. P. 
Published: December 2004

AbstractThe proton spectrum of furan oriented in the nematic phase of anisoleazophenyl‐n‐capronate has been analysed. The ratios of the various interproton distances as well as the orientation parameters and the signs of the indirect coupling constants for furan are determined.
Zur Bestimmung von Aktivitäten und Konzentrationen mit natriumempfindlichen Glaselektroden
Authors: Schindler P. , Wälti E. 
Published: December 2004

AbstractThe e.m.f. of the cell Ag, AgCl/NaCl solution/sodium sensitive glass electrode was measured at 25°C. In pure water as a solvent, measured activity coefficients agree with tabulated osmotically determined values; hence, the ideality of the sodium response of the glass electrode is confirmed. Choosing a Tris – Tris. HCl buffer of the constant ionic strength 0,5M as a solvent, the applicability of HARNED'S rule was demonstrated. Conditions for measuring sodium ion concentrations with sodium sensitive glass electrodes are discussed.
Die Zustandsdiagramme von Quecksilber(II)‐Jodid mit den dreiwertigen Jodiden von drei Elementen der 5. Gruppe des Periodischen Systems
Authors: Gämann A. 
Published: December 2004

AbstractThe temperature/concentration diagrams of the binary systems of HgJ2 with AsJ3, SbJ3, and BiJ3 are determined by differential‐thermal analysis. In addition to the temperature of the several phase transitions the peak areas of the differential curves are evaluated as a new quantity of measurement. Eutectic systems are found in each case.
Darstellung von (−)‐iso‐Caryophyllen aus (−)‐Caryophyllen durch photochemisch erzeugte Thiylradikale
Authors: Schulte‐Elte K. H. , Ohloff G. 
Published: December 2004

AbstractA simple method for preparing (−)‐iso‐caryophyllene (2) by irradiation of (−)‐caryophyllene (1) with a high‐pressure mercury lamp in the presence of small quantities of diphenyldisulphide is described.
ESR.‐Spektrum von Diphenylpicrylhydrazyl (DPPH)
Authors: Haniotis Z. , Günthard Hs. H. 
Published: December 2004

AbstractThe ESR. sprectra of DPPH in mixed organic solvents have been measured with a K‐band superheterodyne spectrometer and self‐locking magnetometer with high precision. Approximately 150 lines have been resolved in the spectra. Both the zero and first order derivative spectra were analyzed by a line shape analysis program for determination of the coupling constants. The smallest coupling constant was found to be 377 ± 5 mG, all other coupling parameter are multiples of this constant. A set of most probable coupling constants is given. The two nitrogen coupling constants are found to be equal within experimental error, and there exist several rotational relations and several possible assignments.
Über die Darstellung eines 1:2‐Chrom(III)‐Komplexes vom Sandwichtypus für FOURIER‐Analyse
Authors: Schetty G. 
Published: December 2004

AbstractA 1:2‐Chromium(III)‐«sandwich»‐complex of the anthranilic acid → pyrazolone series has been prepared for FOURIER‐analysis.
Umsetzungen des Cyclohex‐3‐en‐carbaldehyd‐p‐toluolsulfonylhydrazons
Authors: Rey M. , Begrich R. , Kirmse W. , Dreiding André S. 
Published: December 2004

AbstractThe vacuum thermolysis (80–90°) of the sodium salt of cyclohex‐3‐ene‐carbaldehyde p‐toluenesulfonylhydrazone (1) in silicone oil gave diazomethyl‐cyclohex‐3‐ene (2). Pyrolytic and photolytic decomposition of this diazo compound 2 lead to methylenecyclohex‐3‐ene (5) and bicyclo [4.1.0]hept‐2‐ene (6) (about 3:1), while the CuCl catalyzed cleavage yielded only 5. The postulated carbene mechanism should also apply under the direct aprotic decomposition conditions of the sodium salt of 1 in diglyme, where methylenecyclohex‐3‐ene and bicyclo[4.1.0]hept‐2‐ene (about 3:1) were formed besides small amounts of 1‐methylcyclohexa‐1, 3‐diene (9) and bicyclo [4.1.0]hept‐3‐ene (8). Under protic conditions (in ethylene‐glycol) methylenecyclohex‐3‐ene, 1‐methylcyclohexa‐1, 3‐diene and 1‐methylcyclohexa‐1, 4‐diene (14) were produced in a ratio of 1:1:1.The direct mild thermolysis of cyclohex‐3‐ene‐carbaldehyde p‐toluenesulfonylhydrazone (1) in benzene solution afforded N‐(p‐toluenesulfinyl)‐O‐(p‐toluenesulfinyl)‐cyclohex‐3‐en‐yl‐α‐methanolamine (15) and di‐(cyclohex‐3‐en‐yl‐methyl)‐ammonium p‐toluenesulfonate (16), the structures of which were supported by their nmr. spectra and by alkaline cleavage.
Magneto‐optische Rotationsdispersion von gesättigten aliphatischen Kohlenwasserstoffen
Authors: Wipf H.‐K. , Clerc J. T. , Simon W. 
Published: December 2004

AbstractMagneto‐optical rotatory dispersion (MORD.) of saturated aliphatic hydrocarbons can be described very accurately by an equation of the DRUDE type. The two parameters, appearing in such an equation, have been determined from MOR. measurements in the region of 240 to 500 nm by the method of least squares. These parameters show a systematic dependence on the structure of the investigated hydrocarbons. An empirical rule for the approximation of the DRUDE parameters is given which in turn allow the calculation of the VERDET constant for a given structure at any wavelength between 240 and 500 nm.
Thermoanalytische und massenspektrometrische Untersuchung der Zersetzung von Zinkoxalat‐Dihydrat. Thermoanalytische Untersuchungen XII
Authors: Giovanoli R. , Wiedemann H. G. 
Published: December 2004

AbstractThe dehydration and pyrolysis of zinc oxalate dihydrate are re‐examined by thermo‐analytical methods at linearily increasing temperature in air, nitrogen, water vapour, and high vacuum. Simultaneous analysis of the gaseous decomposition products by means of mass spectrometry confirms previous authors' results obtained with other methods. The activation energy of the thermal decomposition of ZnC2O4 above 340° has been found to be 40,4 ± 2,6 kcal/mol.The rehydration of ZnC2O4 has been investigated at various water vapour pressures. In an atmosphere virtually saturated with moisture, the rehydration leads to the dihydrate and is easily controlled on the thermobalance. The dihydrate itself takes up an ill‐defined fraction of surplus water. The thermal effects resulting from surface water on the dihydrate have been investigated by DTA (freezing and melting peaks). They disappear below 5% w/w of surplus water in the dihydrate.The surface of cristallites of the decomposition products calculated from particle size (from X‐ray line broadening) is much larger than the surface determined by the BET‐method. However, for ZnO in its state immediately after decomposition of ZnC2O4, both methods give similar results. Thus, dihydration of ZnC2O4 · 2 H2O produces a considerable inner surface of ZnC2O4 not accessible to gas adsorption. This surface is considered to be covered by adsorbed water, which would explain the remarkable amount of water retained during dehydration. The final product, ZnO, sinters rapidly at temperatures higher than 500–600°.
Sur une nouvelle synthèse et les caractéristiques chimico‐physiques du picolylidène‐2‐bis‐(p‐phénylsulfate de sodium) (DCI: «Picosulfate de sodium»)
Authors: Pala G. , Crescenzi E. , Bietti G. 
Published: December 2004

AbstractThe synthesis of 2‐picolylidene‐bis‐(p‐phenylsulfuric acid) disodium salt (I, DCI: ‘sodium picosulfate’) has been realized by two routes. I has been characterized by the usual analytical data and UV., IR. and PMR. spectral properties.
Sigmatropische Umlagerungen von Aryl‐propargyläthern; Synthese von 1, 5‐Dimethyl‐6‐methylen‐tricyclo[3, 2, 1, 02,7]‐oct‐3‐en‐8‐on‐Derivaten. Vorläufige Mitteilung
Authors: Zsindely J. , Schmid H. 
Published: December 2004

Abstract2, 6‐Dimethylphenyl propargyl ether (10) and its derivatives 12–15 rearrange thermally to 1, 5‐dimethyl‐6‐methylene‐tricyclo [3.2.1.02,7]oct‐3‐en‐8‐one (9) and related compounds 16–19. The ethers undergo first an aromatic [3, 3]‐sigmatropic rearrangement to ortho‐allenyldienones 11, which then undergo ring closure to the tricyclic products by an electrocyclic reaction.Only in the case of the γ‐methylpropargyl ether 13, the ortho‐dienone 11 is further rearranged in low yield to the para‐butynylphenol 20, but the tricyclic ketone 17 is again the main product.New data show that the known thermal cyclisation of aryl propargyl ethers to chromenes (e. g. 4 → 8) involves a preliminary [3, 3]‐sigmatropic rearrangement.
5,5′‐Disubstituierte Diphensäure‐Derivate
Authors: Weis C. D. 
Published: December 2004

Abstract5,5′‐Dichloro‐2,2′‐biphenyldicarboxylic acid is readily accessible by oxidation of 3,6‐dichloro‐9, 10‐phenanthrenequinone, which in turn has been prepared earlier starting from DDT. Various substitutions and transformations of the 5, 5′‐dichloro‐2, 2′‐biphenyldicarboxylic acid and derivatives are reported.
Über die Wertigkeit des Kobalts in Azofarbstoffkomplexen
Authors: Wittwer C. 
Published: December 2004

AbstractThe CoII‐azocomplexes (1:2) have been prepared and the conditions for their existence are defined. The oxidation to the CoIII‐complex by either oxygen or by the dyestuff itself is described. In the case of dyestuff‐oxidation, the azo group is reduced to the respective amines. The formation of CoIII‐azocomplexes in a technical scale by metallizing with CoII‐salts is discussed.
Selektive Reduktion der 1,2‐Doppelbindung in Δ1,4‐3‐Oxo‐Steroiden. Über Steroide, 213. Mitteilung
Authors: Wieland P. , Anner G. 
Published: December 2004

AbstractA new method for the selective reduction of the 1,2‐double bond in Δ1,4‐3‐oxo‐steroids is described.
Der oxydative Abbau von Roridin A, ein weiterer Beweis für die Art der Verknüpfung der Roridinsäure mit Verrucarol. Verrucarine und Roridine, 17. Mitteilung [1]
Authors: Achini R. , Tamm Ch. 
Published: December 2004

AbstractEpoxidation of di‐O‐acetyl‐roridin A (2) gave the two mono‐epoxides 3 (not pure) and 4 (main product) and the di‐epoxide 5. Subsequent treatment of 4 with ozone and NaBH4 led to the esters 6 and 8. They yielded the acetylderivatives 7 and 9 respectively. Since the degradation products prove the sites of the ester linkages also in roridin A (1), the structure of this antibiotic is proved beyond any doubt.
Ringöffnung von Nitrothiazolen
Authors: Ilvespää Atso O. 
Published: December 2004

AbstractThe reaction between 2‐halogeno‐5‐nitro‐thiazoles and amines has been studied. Especially the sterically hindered strongly basic secondary aliphatic amines tend to cause opening of the thiazole ring system, resulting in the formation of the heretofore unknown (1‐nitro‐2‐amino‐vinyl)‐thiocyanates. The ring opening is favored by a highly polar solvent, such as dimethyl sulfoxide. A simple reaction mechanism is proposed and some properties of these new compounds are discussed.
Menschliches Calcitonin I. Isolierung und Charakterisierung
Authors: Riniker B. , Neher R. , Maier R. , Kahnt F. W. , Byfield P. G. H. , Gudmundsson T. V. , Galante L. , Macintyre I. 
Published: December 2004

AbstractTwo highly active calcitonin peptides, M with 32 amino acids, and D a dimer of M, were isolated from a large human mediastinal C cell tumour. D can easily be transformed into M by the action of 1N ammonia; D and M afford two different sulphoxides, but all four peptides yield the same product upon oxidation with performic acid. Both D and M have a potency of about 120 MRC units/mg dry weight; their sulphoxides, by contrast, are almost inactive. Tryptic digestion of M produces an N‐terminal octadecapeptide (TrI) and a C‐terminal tetradecapeptide (TrII), the latter being also obtained from D. Amino acid analysis and other analytical data are presented. The structure of the human calcitonin peptides D and M is thus very different from that of porcine α‐thyrocalcitonin.
Beiträge zur Chemie der Si‐N‐ Bindung, XVI [1] Umsilylierungen an 1,3‐Bis‐dimethylchlorsilyl‐1,3‐diaza‐2,2,4,4‐tetramethyl‐cyclodisilazan
Authors: Fink Walter 
Published: December 2004

AbstractDie Umsetzung von Diphenyldichlorsilan mit 1, 3‐Bis‐dimethylchlorsilyl‐1, 3‐diaza‐2,2,4,4‐tetramethyl‐cyclodisilazan in den molaren Verhältnissen 1:1 bis 4:1 führt zu isomeren partiell und per‐phenylierten 1, 3‐diorganochlor‐funktionellen Cyclodisilazanen, die isoliert und identifiziert werden.
Untersuchungen an Kobalt‐Zink‐Hydroxid, Co3Zn2(OH)10, 2H2O
Authors: Günter J. R. , Oswald H. R. 
Published: December 2004

AbstractA new cobalt‐zinc‐hydroxide with the composition Co3Zn2(OH)10 · 2 H2O is described. The X‐ray powder diffraction pattern can be indexed with a monoclinic cell, a = 5.49 Å, b = 6.22 Å, c = 15.45 Å, β = 100.7º. A possible structure of this new compound, with cobalt ions in octahedral and zinc ions in tetrahedral coordination, is proposed.
Photochemische Reaktionen. 48. Mitteilung [1]. Photolytische Substitutionen von Aromaten mit α‐Sulfonyloxyketonen. Vorläufige Mitteilung
Authors: Tuinman A. , Iwasaki [2] S. , Schaffner K. , Jeger O. 
Published: December 2004

AbstractPhoto‐excited arenes have been found to initiate a substitution reaction in which the sulfonyloxy group of α‐sulfonyloxyketones is displaced, and the corresponding β‐arylketones are formed. Evidence is presented that the electronically excited arene need not be involved directly in the substitution step. It would seem to be more likely that upon interaction with the sulfonyloxyketone a reactive species derived from the latter is produced which is capable of aromatic substitution.
Kupferkomplexe von Bisamiden, III Oxamidsäurederivate als dreizähnige Liganden
Authors: Kaden Th. , Zuberbühler A. 
Published: December 2004

AbstractBy potentiometry and spectrophotometry Cu2+ and N‐(2‐dimethylaminoethyl)‐oxamide are shown to form different mononuclear complexes and a binuclear species containing a hydroxo bridge. Visible absorption spectra of each species were obtained by an interactive process and used to assign definite structures to them. Stability constants and concentrations of each complex were calculated from the potentiometric data. The ligand behaves as a tridentate chelating agent, and hydrolysis of one coordinated water molecule predominates over deprotonation of the second amid group.
Zur Thermodynamik der Metallcarbonate. 2. Mitteilung [1]. Löslichkeitskonstanten und Freie Bildungsenthalpien von Cu2(OH)2CO3 (Malachit) und Cu3(OH)2(CO3)2 (Azurit) bei 25°C
Authors: Schindler P. , Reinert M. , Gamsjäger H. 
Published: December 2004

AbstractThe solubilities of Cu2(OH)2CO3 (malachite) and Cu3(OH)2(CO3)2 (azurite) have been studied at 25° C in solutions of the constant ionic strength 0,2 M consisting primarily of sodium perchlorate. From experimental data the following values for equilibrium constants and Gibbs energies of formation are deduced:

Predominance area diagrams for the ternary system Cu2+H2O‐CO2(g), including CuO, Cu(OH)2, Cu2(OH)2CO3, Cu3(OH)2(CO3)2, Cu2+ and Cu (CO3)22−, are given.
Contribution à l'étude du système quaternaire K+—NH4+—CrO4−−—SO4−−—H2O: I. les isothermes de 25° des systèmes ternaires limites
Authors: Flatt R. , Brunisholz G. , Merbach A. 
Published: December 2004

AbstractThe four ternary limiting isotherms of the system K+− NH4+CrO4−−SO4−−H2O are given for 25° C. In the systems K2SO4(NH4)2SO4H2O and K2SO4K2CrO4H2O only one solid phase has been encountered; both systems belong to the type I of the ROOZEBOOM classification. A miscibility gap is present in the systems (NH4)2CrO4K2CrO4H2O and (NH4)2CrO4(NH4)2SO4H2O; they belong to ROOZEBOOM'S type V.
Sur les constituants odorants de l'essence absolue de Cassie (Acacia farnesiana WILLD.)
Authors: Demole E. , Enggist P. , Stoll M. 
Published: December 2004

AbstractThe absolute oil of cassie (Acacia farnesiana WILLD.) has been thoroughly investigated by using several combined chromatographic techniques. Among the 38 new constituents which were thus identified in this oil, four deserve a particular mention, namely, the cis‐3‐methyldec‐3‐en‐1‐ol (I), the related acid III, the trans‐3‐methyl‐dec‐4‐enoic acid (IV), and the homoterpene lactone dihydroactinidiolide (II). With the exception of the last one, these unusual C11 compounds play a prominent role in the characteristic fragrance of cassie oil.
Contribution à l'étude du système quaternaire KCI‐RbCI‐H2O: I. Les isothermes de 25° des systèmes ternaires limites
Authors: Merbach A. , Gonella J. 
Published: December 2004

AbstractThe three ternary limiting isotherms of the system KCI‐RbCI‐CsCI‐H2O are given for 25°. The system KCI‐RbCI‐H2O, with only one solid phase present, belongs to the type I of the ROOZEBOOM classification. A large miscibility gap is present in the systems RbCI‐CsCI‐H2O and KCI‐CsCI‐H2O; in the latter the incorporation is almost negligible; they belong to ROOZEBOOM's type IV.
Darstellung und spektroskopische Untersuchungen von Kupferkomplexen mit verschiedenen Mikrostrukturen. I. Halogeno‐Stickstoffbasen‐Kupfer (II)‐Komplexe
Authors: Ludwig W. , Gasser F. 
Published: December 2004

AbstractEs wird über Darstellung und spektroskopische Untersuchungen von Kupfer (II)‐Komplexen CuL2X2 und CuL4X2 mit grösstenteils unidentaten Stickstoffbasen berichtet. Durch Ausnützung der Einflüsse von Substitutenten am Pyridin‐ bzw. Piperidinring der Liganden L wurden Komplexe verschiedener Stereometrie erhalten, an denen sich der Zusammenhang zwischen Mikrosymmetrie und Elektronenspektren studieren liess. Insbesondere konnte die Stauchung eines pseudotetraedrischen Teilchens über eine Reihe von Zwischenstufen bis zur planaren Anordnung der 4 Ligandatome anhand einer Anzahl von Verbindungen des Type CuL2X2 verfolgt werden. Die Arbeit befasst sich dabei im wesentlichen mit den Ligandenfeldspektren (über die Elektronentransfer‐Übergange sol1 später berichtet werden). Der letzte Ligandenfeldübergang tritt bei den planaren Komplexen ‐ offenbar wegen. Abschirmung des Zentral‐Ions vor Störungen längs der z‐achse bei unerwartet hoher Energie auf.
Stoffwechselprodukte von Mikroorganismen 73. Mitteilung [1] Chlorothricin und Des‐chlorothoricin
Authors: Keller‐Schierlein W. , Muntwyler R. , Pache W. , Zähner H. 
Published: December 2004

AbstractA crystalline mixture of the antibiotics chlorothricin and dechlorothricin was isolated from a strain of Streptomyces antibioticus. By degradation 5‐chloro‐6‐methylsalicylic acid methyl ether (from chlorothricin) and 6‐methylsalicylic acid methyl‐ether (from dechlorothricin) were isolated. Common degradation products of both antibiotics were 2‐deoxy‐D‐rhamniose and an aglycone, C30H38O8, of unknown structure. The antibiotic mixtures was active against GRAM positive bacteria on syntheitc, but not on complex media.
Niederdruck‐Oligomerisation von Mono‐Olefinen mit löslichen Nickel/Aluminium‐Bimetallkatalysatoren, Teil II Reaktionskinetische Untersuchungen über die Dimerisation von Propen
Authors: Onsager Olav‐Torgeir , Wang Hagbarth , Blindheim Ulf 
Published: December 2004

AbstractThe kinetics of the dimerization of propene in organic solvents under the influence of a homogeneous catalyst containing π‐tetramethylcyclobutadiene‐nickel dichloride and a prereacted mixture of ethylaluminiumdichloride and tri‐n‐butylphosphin are reported. The primary reaction products are: 2‐methyl‐1‐pentene, 4‐methyl‐2‐pentene (cis/trans), 2,3‐dimethyl‐1‐butene and 2‐Hexene (cis/trans) The results are in accordance with a coordinative mechanism on nickel. New results on the reaction between ethylaluminiumdichloride and O, N and P containing electrondonors are also discussed.
Allongement de la chaîne carbonée d'un aldéhydosucre à groupements hydroxyles bloqués par l'utilisation d'ylides du phosphore non stabilisés
Authors: Tronchet J. M. J. , Doelker E. , Baehler Br. 
Published: December 2004

AbstractThe action of the unstabilized WITTIG reagents methylene triphenylphosphorane and methoxymethylene triphenylphosphorane on 2,3:4,5‐di‐O‐isopropylidene aldehydo‐L‐arabinose led with acceptable yields to the corresponding unsaturated sugars, providing a direct route for a one‐carbon chain extension in the carbohydrate series.
Synthèse de quelques dérivés de l'amino‐3‐désoxy‐3‐érythrose et l'amino‐3‐désoxy‐3‐érythrose D‐3
Authors: Tronchet J. M. J. , Graf R. , Tronchet Mme J. 
Published: December 2004

AbstractThe synthesis of derivatives of 3‐amino‐3‐deoxy‐L‐erythrose by LAH or LAD reduction of the oxime of 1,2‐O‐isopropylidene α‐L‐glycero‐tetros‐3‐ulofuranose is described.