bluuebunny/crossref_metadata_2025_split huggingface dataset:
Heterodiamantane und strukturell verwandte Verbindungen. III.. Pentacyclische diäther der C11‐reihe. 5, 13‐Dioxapentacyclo‐[6.5.0.02,6.03,12.04,9]tridecan, 4, 13‐dioxapentacyclo [6.4.1.02,7.03,10.05,9]tridecan und 3, 10‐dioxapentacyclo [7.3.1.02,7.04,12.06,11]tridecan
Authors: Ammann Willi , Ganter Camille 
Published: December 2004

Heterodiamantanes and Structurally Related Compounds. Part III. The Pentacyclic C11‐Diethers 5, 13‐Dioxapentacyclo [6.5.0.02,6.03,12.04,9]tridecane, 4, 13‐Dioxapentacyclo [6.4.1.02,7.03,10.05,9]tridecane, and 3, 10‐Dioxapentacyclo [7.3.1.02,7.04,12.06,11]tridecaneIn connection with the studies on heterodiamantanes and structurally related compounds the three novel pentacyclic diethers 3–5 were prepared starting from the cyclopentadienone dimer 6. All four compounds have as common features a central carbocyclic 6‐membered ring with four axial alkyl substituents and two oxygen functions in 1, 4 position. The required eleventh C‐atom was introduced by dichlorocarbene addition either to 6 ( → 7) (Scheme 2) or to 29 ( → 28) (Scheme 4).Diether 3 was obtained by reduction of 26 (Scheme 2), a suitable precursor prepared either by intramolecular addition (24 → 26; Scheme 2) or substitution (30 → 26, 31 → 26; Scheme 4), as well as by direct substitution (44 → 3, 42 → 3; Scheme 5). Diether 4 was the product of a direct substitution (39 → 4, 36 → 4; Scheme 5). The synthesis of diether 5 was achieved from the addition product 51 (resulting from the alcohols 47 and 48; Scheme 6).Diether 4 is the thermodynamically least stable of the three diethers 3–5. It was easily isomerized to 5 on treatment with concentrated sulfuric acid in benzene whereas 3 and 5 remained unchanged under these conditions.
Rates of Proton Abstraction from Conjugated Dienes in the Gas Phase
Authors: Meyer Felix K. , Pellerite Mark J. , Brauman John I. 
Published: December 2004

AbstractThe rates of proton transfer from 2, 4‐hexadiene, 1, 3‐cycloheptadiene, cyclopentadiene and acetone to t‐butoxide have been measured in the gas phase using pulsed‐ion‐cyclotron‐resonance spectroscopy. The rate constants are (units of 10−10 cm3 molecule−1 s−1): 2.7 ± 0.4, 3.8 ± 0.4, 6.1 ± 0.7 and 10.8 ± 1.5, respectively. These results are analyzed in terms of the properties of the encounter complex and reaction transition states. The reaction profile for t‐butoxide + cyclopentadiene is modeled using RRKM theory and an estimate for the central barrier height is obtained.
Carotenoids and Related Compounds. Part 36.. Further syntheses of zeaxanthin and rhodoxanthin
Authors: Ellis Peter R. , Faruk A. Erol , Moss Gerard P. , Weedon Basil C. L. 
Published: December 2004

AbstractA modification of a previously reported synthesis of zeaxanthin (1), and routes to both zeaxanthin and rhodoxanthin (2) from α‐ionone, are described.
De la chimie des ptérines. 78e Communication.. Synthèse de l'ester tripolyphosphorique de la tétrahydro‐5, 6, 7, 8‐D‐néoptérine. Essai d'interprétation de la biosynthèse de la L‐sépiaptérine
Authors: Antoulas Siméon , Viscontini Max 
Published: December 2004

Synthesis of 5, 6, 7, 8‐Tetrahydro‐D‐neopterine tripolyphosphate. Attempt to Interpret the Biosynthesis of L‐SepiapterineThe synthesis was achieved by phosphorylation of tetrahydro‐5, 6, 7, 8‐D‐neopterine with polyphosphoric acid. The product is sensitive to light, moisture and oxidation like the other tetrahydropetrines. After oxidation in aqueous solution, D, L‐sepiapterine was isolated in 5% yield. The oxidation of non‐phosphorylated tetrahydro‐5, 6, 7, 8‐D‐neopterine under the same conditions led to D‐sepiapterine without inversion of the configuration. These findings were used to give a tentative explanation for the biosynthesis of natural L‐sepiapterine from the D‐neopterine.
New Triterpenes from the Bark of Western White Pine (Pinus monticola DOUGL.)
Authors: Kutney James P. , Eigendorf Günter , Worth Brian R. , Rowe John W. , Conner Anthony H. , Nagasampagi Bhimsen A. 
Published: December 2004

AbstractEleven new triterpenes with the lanostene‐type skeleton were isolated from the benzene extract of western white pine bark. Their structures were determined mainly on the basis of physical and spectral data.
Photochemische Reaktionen. 121. Mitteilung. Zur Photochemie von ε,ζ‐Methano‐α,γ‐dienonen und 7,8‐Methano‐1,3,5‐trienen
Authors: Ishii Keitaro , Frei Bruno , Wolf Hans Richard , Jeger Oskar 
Published: December 2004

Photochemistry of ε,ζ‐Methano‐α,γ‐dienones and 7,8‐Methano‐1,3,5‐trienesIrradiation of the δ‐cyclopropyl‐dienone (E)‐6 (λ ≥ 347 nm) gives (Z)‐6, 10 (1,5‐sigmatropic H‐shift), (E/Z)‐9 (electrocyclic process involving C(ε), C(ζ)‐cleavage) and 11 (ring opening).The corresponding 6‐cyclopropyl‐triene (E)‐7 gives on singlet excitation (δ > 280 nm) 14 (1,5‐sigmatropic H‐shift) and, to a smaller extent, the bicyclo [3.2.0] heptenyl‐dienes (E/Z)‐13. However, on triplet excitation (λ ≥ 347 nm, benzophenone) (E)‐7 gives (E/Z)‐13 as the main products. On both 1π,π*‐ and 3π,π*‐excitation, (Z)‐7 and 15 are formed in small amounts.
Novel Approach to the Synthesis of 6‐Substituted 5,6‐Dihydro‐2(2H)‐pyranones
Authors: Fehr Charles , Galindo José , Ohloff Günther 
Published: December 2004

AbstractEasily accessible dihydropyrans 9, 10, 12 and 19 are precursors for the synthesis of 6‐substituted 5,6‐dihydro‐2 (2H)‐pyranones and 6‐substituted tetrahydro‐2‐pyranones. Syntheses of massoia lactone (3), argentilactone (5), tuberolactone (4) and jasmine lactone (2) from acrolein (6), acrolein dimer (7) or glutaraldehyde (16) are described.
A 13C‐NMR. Study of naphthalene chromium complexes. Correlation with reactivity: Nucleophilic aromatic substitution reactions
Authors: Desobry Vincent , Kündig Ernst Peter 
Published: December 2004

AbstractThe 13C‐NMR. spectra of the series of complexes η6‐naphthalene · CrL3 (LCO (1), PF3 (2), PF2OMe (6), P(OMe)3 (3), C10H8 (= 3 L) (4) and PMe3 (5)) are reported. Definite assignments of the 13C‐NMR. resonances were made through the synthesis of [2, 3, 6, 7‐2H4]‐naphthalene complexes. The coordinated ring 13C‐resonance are found to undergo a smooth transition to higher field with increasing donor character of the coligands L. A correlation of the coordination shifts with the reactivity of the coordinated naphthalene is proposed. In complexes containing strong acceptor ligands the naphthalene is activated to attack by nucleophiles. Sequential treatment of complexes 1–4, 6 and [C10H8FeC5H5]+[PF6]− (7) with stabilized carbanions and I2 or Ce(IV)‐salt yields α‐substituted naphthalenes in the case of 1, 2, 6 and 7 but not in the case of 3 and 4. Treatment of 3 with an excess of HBF4 results not in the expected metal protonation but in a novel ligand transformation to yield 6.
The Electronic Structure of Phenylene and Naphthylene Bicyclobutanes. Photoelectron spectroscopy and model calculations
Authors: Gleiter Rolf , Gubernator Klaus , Eckert‐Maksić Mirjana , Spanget‐Larsen Jens , Bianco Bernard , Gandillon Gérard , Burger Ulrich 
Published: December 2004

AbstractThe photoelectron (PE.) spectra of 1,2,3‐methenoindane (2), 1,2,3‐metheno‐2,3‐dihydro‐1H‐cyclopenta [b]naphthalene (3) and 1,2,3‐metheno‐2,3‐dihydro‐1H‐phenalene (4) are investigated. The PE. spectrum of 1,3‐methano‐2,3‐dihydrophenalene (7) is reported and compared with that of 4. The experimental results are analyzed in terms of empirical correlation diagrams and the results of semiempirical MINDO/3 and CNDO/S calculations. The analysis indicates that the strong impact of the bicyclobutylene group on the spectroscopic properties of the aromatic π‐systems in 2, 3 and 4 is due to hyperconjugative interactions involving bicyclobutane Walsh orbitals.
Von der basenkatalysierten Ringöffnung von 2H‐Azirinen zu einer α‐Alkylierungsmethode von primären Aminen
Authors: Schulthess Adrian Heinz , Hansen Hans‐Jürgen 
Published: December 2004

From a Base Catalyzed Ring Opening of 2H‐Azirines to an α‐Alkylation Method of Primary AminesIt is shown that fluorene‐9′‐spiro‐2‐(3‐phenyl‐2H‐azirine) (1) on treatment with various alcohols in the presence of the corresponding alkoxide ions yields N‐(9′‐fluorenyl)benzimidates 2a‐d (Scheme 1). 2,2,3‐Triphenyl‐2H‐azirine (3) reacts with methanol in a similar manner (Scheme 2). Benzimidates 2a (Scheme 3), 8 (Scheme 4) and and 10 (Scheme 5) can easily be deprotonated by butyllithium (BuLi) or lithium diisopropylamide (LDA) in tetrahydrofuran (THF) to 1‐methoxy‐2‐aza‐allylanions, that can be alkylated, at C(3), exclusively, by various electrophiles (e.g. R‐X(X = I, Br), RCHO or methyl acrylate (see also Scheme 6)). As the acidic hydrolyses (1N HCl) of benzimidates 9 and 11 leads to the corresponding α‐alkylated free amines 15 and 18 (Scheme 7 and 8), benzoyl derivatives 16 and 19 are obtained from the hydrolysis under basic conditions. On the other hand, it is observed that a catalyzed Chapman rearrangement of 9 and 11 results in the formation of N‐benzoyl‐N‐methyl derivatives 17 and 20 (Scheme 7 and 8).The described reactions offer a simple method for the α‐alkylation of activated primary amines.
The Crystal Structure of the Pentaphenylethane/Acetone Solvate by X‐Ray Analysis
Authors: Bernardinelli Gerald , Gerdil Raymond 
Published: December 2004

AbstractThe crystal structure of the acetone solvate of pentaphenylethane (C32H26 · 1/2 C3H6O; monoclinic, a = 8.625, b = 16.587, c = 16.961 Å, β = 95.75°, space group P21/c, Z = 4) has been determined by X‐ray analysis. The structure was solved by direct methods and refined to a final R of 0.056. The central ethane bond has a length of 1.612 (3) Å. The cavity enclosing the solvent retains the inversion centre in the crystal: as a consequence, a two‐fold disordered orientation was observed for the acetone molecule. The rotational orientation of the methyl groups was found to be staggered with respect to the C, O‐bond.
Eine neue Synthese von DL‐Armentomycin und verwandten 2‐Amino‐4‐polyhalobuttersäuren
Authors: Heinzer Franz , Martin Pierre 
Published: December 2004

A New Synthesis of DL‐Armentomycin and Related 2‐Amino‐4‐polyhalobutyric AcidsAn efficient method for the synthesis of 2‐amino‐4‐halobutyric acids 2 starting from the corresponding ethyl 2,4‐polyhalobutyrates 1 is presented (s. Scheme 1). The method is illustrated by a high yield synthesis of the known antibiotic DL‐armentomycin (= 2‐amino‐4,4‐dichlorobutyric acid; 2a).
Molecular Structure of the Ethylenediammonium Complex of a Tetracarboxy‐macrocyclic Receptor Molecule
Authors: Daly John J. , Schönholzer Peter , Behr Jean‐Paul , Lehn Jean‐Marie 
Published: December 2004

AbstractThe crystal and molecular structure of the complex formed by the ionized bistartro‐[18]‐crown‐6 receptor molecule 1 with the ethylenediammonium cation, is described. The macrocycle is roughly planar, the carboxy groups of each tartaric acid residue being in a diaxial relationship and extending above and below this plane. This conformation allows ‘lateral’ interactions with bound species to occur.The substrate is sandwiched between two macrocycles, with one of its NH heads anchored to the polyether core, and the other one in contact with the two carboxy groups of the neighboring molecule.
Polarographische Untersuchungen an symmetrischen Triazacarbocyaninen in Acetonitril
Authors: Hellrung Bruno 
Published: December 2004

Polarographic Investigations on Symmetrical Triazacarbocyanine Dyes in Acetonitrile SolutionThe reduction behaviour of thirteen symmetrical triazacarbocyanine dyes with different heterocycles in acetonitrile solution has been investigated by means of dc‐ and ac‐polarography, cyclic oscillopolarography and coulometry.The reduction mechanism has been found to be of the type eec with the first step being reversible and the second step being reversible to irreversible. Reduction potentials, transfer coefficients and specific currents of both steps have been measured (E1/2: −0,110 to −1.025 V vs. Ag/AgCl for the first step) and compared with known properties of carbocyanines and triazenium salts and to HMO calculations.The effect of substituents X has been studied on the compounds 1,3‐diethyl‐2‐[(1,3‐diethyl‐5‐X‐benzimidazolin‐2‐yliden)triazenyl]‐5‐X‐benzimidazolium‐tetra‐fluoroborate (1a (X)) and 3‐ethyl‐2‐[(3‐ethyl‐5‐X‐Δ4‐1,3‐triazolin‐2‐yliden)triazenyl]‐5‐X‐1,3‐thiazolium‐tetrafluoroborate (1g(X)), and p‐values of 0,36 and 0,72 V, respectively, have been found.
NMR.‐spektroskopische Methoden als Reinheitskriterien isomerer Weinsäuren und Weinsäureester
Authors: Pfenninger Armin , Hochrainer August 
Published: December 2004

NMR.‐spectroscopic Methods as Criteria of the Purity of Isomeric Tartaric Acids and Their Estersmeso‐Tartaric acid (2) can be distinguished either from the natural (+)‐(2R, 3R)‐tartaric acid (1) or the ‘unnatural’ (−)‐(2S, 3S)‐tartaric acid (1′) or their racemic mixture, by 1H‐NMR.‐spectral resolution using europium chloride in aqueous solution. Diastereomeric esters have been prepared from different esters of tartaric acid 3 and the Mosher reagent 4 and the purities of the enantiomers of 3 have been checked by 1H‐NMR. spectroscopy.
Influence of the water content of the solvent on the product distribution in the electrohydrodimerization of 2‐cyclohexenones
Authors: Tissot Paul , Surbeck Jean‐Paul , Gülaçar Fazil O. , Margaretha Paul 
Published: December 2004

AbstractThe product distribution of compounds 2, 3 and 4 formed in the electrohydrodimerization (EHD) of 1 was determined as function of the water content of the solvent (CH3CN). The presence of water favours the formation of the glycols 4 and reduces the relative amounts of 1,6‐diketones 2 and hydroxyketones 3, as determined by GC./MS.‐analysis.
A New, Stereoselective Approach to the [3.3.3]Propellane System: Synthesis of (±)‐modhephene. Preliminary communication
Authors: Oppolzer Wolfgang , Marazza Fabrizio 
Published: December 2004

AbstractThe unusual propellane skeleton of the sesquiterpene modhephene (1) has been synthesized starting from cyclopentenone (2). The key step 6 → 7 is an efficient and highly stereoselective intramolecular thermal ene‐reaction. Further elaboration of the propellane 7 gave the enone 10 which had been previously converted to (±)‐modhephene (1) in three steps.
Oxygenation of Co(II) Complexes with Tripodal Ligands
Authors: Mäcke Helmut 
Published: December 2004

AbstractThe kinetics of O2‐uptake of five‐coordinated Co2+/tren complexes (tren = 2,2′, 2″‐tris(2‐aminoethyl)amine) have been studied extensively. The kinetics of formation of (tren)Co(O2, OH)Co(tren)3+ exhibits two steps. The rate law of O2‐addition, the first step, was of the form: rate = (k[H+] + kKa)/([H+] + Ka) [Co(tren)2+][O2]. Second‐order rate constants k = 220 ± 19 M−1s−1 and k = 1.8 ± .035 · 103M−1s−1 agreed well from O2‐uptake and (stopped‐flow) spectrophotometric measurements. The protonation constant of the hydroxo complex obtained by equlibrium measurements (spectrophotometric and by pH‐titration) in anaerobic conditions (pKa = 10.03) agreed well with that derived from kinetic data (p Ka = 9.93); k and k are about a factor 100 smaller than those for the pseudooctahedral Co(trien) (H2O). This and the fact that several other Co(II) complexes with five‐coordinated geometry do not exhibit oxygen affinity led to the proposal that the oxygenation mechanism for Co2+/tren complexes involves fast preequilibria between Co(tren) (H2O)2+ and Co(tren) (H2O) and only the latter is assumed to be reactive. The enhanced rate at high pH is explained by rate determining H2O‐exchange in the O2‐addition step and the ability of coordinated OH− to labilize the neighbouring H2O. This mechanism is furthermore supported by the formation of one kinetically preferred isomer of the peroxo‐bridged dicobalt(III) complex (O2 cis to the tertiary N‐atom) and the large negative activation entropy (−30 eu). The second step is the intramolecular bridging reaction:
equation image
is independent of [Co(tren)2+] and [O2] but exhibits a pH‐dependence of the form k3 = k′3[H + ]/(Ka + [H+]); k−3 ( = 5 · 10−5 s−1) was determined independently and from the two rate constants the equilibrium constant was calculated as ≈ 105. The ligand combination as in Co(tren)2+ was shown to provide an excellent balance to form a reversible oxygen carrier; possible reasons for this are discussed.
Total synthesis of racemic ajmalicine and 19‐epi‐ajmalicine
Authors: Gutzwiller Jürg , Pizzolato Giacomo , Uskoković Milan R. 
Published: December 2004

Abstractrac.‐Ajmalicine (31) and 19‐epi‐ajmalicine (30) have been synthesized by a convergent route from the preformed D, E‐ring moieties 25 and 27 and tryptophyl bromide. Two syntheses of the trans‐1‐benzoyl‐3‐vinyl‐4‐piperidineacetic acid (13), used in the preparation of 25 and 27, are also described.
Stereochemistry of the Platinum Catalyzed Hydroformylation of Olefins
Authors: Haelg Paul , Consiglio Giambattista , Pino Piero 
Published: December 2004

AbstractThe deuterioformylation of (Z)‐ or (E)‐2‐butene catalyzed by [DIOP]Pt(SnCl3)‐ClDIOP=2,3‐O‐isopropylidene‐2,3‐dihydroxy‐1,4‐bis(diphenylphosphino)butane.
gives predominantly erythro‐ or threo‐1,3‐[2H]2‐2‐methylbutanal respectively. Hence, hydroformylation by this catalytic system must take place with cis‐stereochemistry.
Zur Chemie der Spiro‐β‐lactame aus der [2+2]‐Cycloaddition von Ketenen an Iminolactone
Authors: Roth Martin 
Published: December 2004

Chemistry of Spiro‐β‐lactamsReactions of the easily accessible spiro‐β‐lactams 1 are described. These comprise hydrogenation, hydrolyses and alcoholyses, reaction with hydrazine, and lead to new heterocyclic compounds. Some further transformations of the products are shown.
Synthesis, Surface Activity and Micelle Formation of Novel Cyanine Dyes
Authors: Barni Ermano , Savarino Piero , Pelizzetti Ezio , Rothenberger Guido 
Published: December 2004

AbstractThe synthesis, surface activity and micelle formation of three novel cyanine dyes with amphiphilic character is described. It is illustrated by combined surface tension and absorption measurements that in one case self‐assembly is highly cooperative leading to aggregates with unique absorption properties.
A Study of N‐Butyl‐(all‐trans‐retinylidene)amine and Its Protonated Species by 1H‐ and 13C‐NMR. Spectroscopy
Authors: Pattaroni Christian , Lauterwein Jürgen 
Published: December 2004

AbstractThe Schiff base of all‐trans‐retinal was investigated in organic solution by 1H‐ and 13C‐NMR. at high field. Complete assignment of the 1H‐NMR. peaks of N‐butyl‐(all‐trans‐retinylidene)amine (2) and the N‐butyl‐(all‐trans‐retinylidene)‐ammonium ion (3) was achieved by INDOR (internuclear double resonance). The vicinal proton coupling constants of the polyene chain show that the π‐bond orders remain unchanged in N‐butyl‐(all‐trans‐retinylidene)amine relative to all‐trans‐retinal (1), but change towards larger π‐delocalization in the N‐butyl‐(all‐trans‐retinylidene)ammonium ion. At −‐61° only one isomer of N‐butyl‐(all‐trans‐retinylidene)ammonium was observed. This was shown to be trans at the imine linkage and independent of the solvent. The trifluoroacetic acid counter‐ion can approach the positive charge of the N‐atom in the weakly polar solvent dichloromethane but not in the leveling solvent methanol. In dichloromethane the nature of the 1:1 complex is a H‐bonded (O−…H‐N+) ion‐pair whose rate of breaking and forming is rapid at RT. Strong stabilization of the ion‐pair resulted from homo‐conjugation with a second molecule of trifluoroacetic acid. Excess of acid efficiently diminished the isomerization rate at the C,N‐bond.
Synthesis and Biological Properties of Enkephalin‐like Peptides Containing Adamantylalanine in Position 4 and 5
Authors: Do Kim Quang , Schwyzer Robert 
Published: December 2004

AbstractThe syntheses of seven [D‐ala‐2]‐enkephalin analogues, H‐Tyr‐ala‐Gly‐X‐Y, with X‐Y = Phe‐Ada‐OH, Phe‐ada‐OH, Phe‐Ada‐NH2, Phe‐ada‐NH2, Ada‐Leu‐OH, Ada‐Leu‐NH2, and Ada‐Ada‐NH2 are described. The compounds with Y = Ada (= L‐Ada) or ada (= D‐Ada) show pronounced morphine‐like activities in certain bioassays, whereas those with X = Ada were most inactive. The analogues were used to explore the influence of steric, electronic, and hydrophobic properties of the side chains of X and Y on opioid activity (see [14]).
Zur Biosynthese der Rubratoxine
Authors: Nieminen Sirkku , Payne Trevor G. , Senn Peter , Tamm Christoph 
Published: December 2004

AbstractIn order to check the hypothesis that rubratoxin B (2), a C26‐metabolite, is formed biogenetically by head‐to‐tail coupling of two identical C13‐precursors derived from decanoic acid and oxaloacetic acid, two labelled forms of the postulated C13‐intermediate 2‐((E)‐1'‐octenyl)‐3‐[14C]methyl‐ and 2‐((E)‐1'‐octenyl)‐3‐[13C]‐methylmaleic anhydride (10), were synthesized. The labelled compounds 10 as well as a number of other 14C]‐ and [13C]‐labelled potential precursors were administered to growing cultures of Penicillium rubrum STOLL. Significant incorporation rates of acetate (as intact units) and malonate were observed. Propionate was incorporated after decarboxylation. Succinate exhibited the highest rate of incorporation. The results are in agreement with the assumption that the C10‐chain is formed by the fatty acid pathway and the C3‐unit via the tricarboxylic acid cycle. After administration of 10 randomization of the label was observed. Thus the question whether compound 10 is a biogenetic intermediate remains unanswered.
1,6‐Additionen an 3‐Methyl‐5‐methyliden‐2‐(5H)‐furanon‐Derivate
Authors: Wyss Heinz , Révész Laszlo , Scheffold Rolf 
Published: December 2004

1,6‐Additions to 3‐Methyl‐5‐methylidene‐2(5H)‐furanone DerivativesThe anions of thiophenol, methyl malonate and malononitrile react with 3‐methyl‐5,6‐dihydro‐2 (4H)‐benzofuranone (1c) by the formation of the corresponding 1,6‐addition products cis‐5c (63%), trans‐6 (42%) and trans‐7 (76%), respectively. Likewise, the reaction of 3‐methyl‐5‐methylidene‐2 (5H)‐furanone (1b) with thiophenol yields the 1,6‐addition product 5b (66%), and with the sodium salt of methyl aceto‐acetate the 1,6‐addition product 8 (11%) and the dispiro‐dilactone 9 (39%).
Vorkommen neuer bifunktioneller. Ester im Römisch‐Kamillenöl (Anthemis nobilisL.)
Authors: Klimes Ivan , Lamparsky Dietmar , Scholz Ernst 
Published: December 2004

Occurrence of New Bifunctional Esters In Roman Camomile Oil (Anthemis nobilis L.)Some novel aliphatic esters of the unusual 3‐hydroxy‐2‐methylidenebutyric acid have been found in the commercially available essential oil. Additionally, esters of (Z)‐2‐methyl‐2‐butenoic acid of structurally similar diols or other bifunctional alcohols have also been identified. Spectral data as well as a synthetic approach to the new esters of 3‐hydroxy‐2‐methylidenebutyric acid are given.
Détermination de la configuration de glycosylaziridines par dichroïsme circulaire. Note de laboratoire
Authors: Tronchet Jean M. J. , Winter‐Mihaly Eva , Massoud Mohamed A. M. , Martin Olivier R. , Barbalat‐Rey Françoise , Ojha‐Poncet Joëlle , Giust Josiane 
Published: December 2004

CD.‐Based Configurational Assignments of GlycosylaziridinesThe relationship between CD.‐curves and the configuration of the trans‐2‐benzoyl‐3‐phenylaziridines was known. By studying a series of cis‐ and trans‐2‐glycosyl‐3‐benzoylaziridines we have shown that CD. allows the assignment of the configuration at both asymetric C‐atoms. As benzoylaziridines can easily be obtained from cyano‐ or alkoxycarbonylaziridines without configurational change, the absolute configuration of these last two classes of compounds can also be assessed by this method.
Magnetic Circular Dichroism and Absorption Spectra of 2‐Methyl‐1, 3‐diazaazulene
Authors: Yamaguchi Hiroyuki , Ata Masafumi , Toyoda Koichi , Mametsuka Hiroaki , Takeshita Hitoshi , Baumann Harold 
Published: December 2004

AbstractThe magnetic circular dichroism and UV. spectra of 2‐methyl‐1, 3‐diazaazulene (2) have been measured. The UV. spectrum is interpreted by making use of CNDO/S MO CI calculations. Our assignment of the first and second absorption band coincides with one of the corresponding bands of 1, 3‐diazaazulene (1) given by Small & Burke. The third and fourth absorption bands are in agreement with those published by Hiratsuka et al. and Tanizaki et al. for 1 and 2‐ethoxy‐1, 3‐diazaazulene, respectively.