Helvetica chimica acta

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  Año 1993, Vol. 76, Número 6

  • Why Pentose- and Not Hexose-Nucleic Acids? Part VII. Pyranosyl-RNA (`p-RNA'). Preliminary Communication

    pág. 2161

    

  • 8-Azaguanine 2',3'-Dideoxyribonucleosides: Glycosylation of the 5-Amino-7-methoxy-3H-1,2,3-triazolo[4,5-d]pyrimidinyl Anion with 2,3-Dideoxy-D-glycero-pentofuranosyl Chloride

    pág. 2184

    

  • Highly Diastereoselective Aldol Reaction of Bicyclo[3.2.1]oct-6-en-3-ones and 8-Oxabicyclo[3.2.1]-oct-6-en-3-ones. (E)-Selective Conversion into à-Alkylidene Ketones

    pág. 2194

    

  • Intramolecular Dynamics of Tetranuclear Iridium Carbonyl Cluster Compounds. Part IV. Derivatives with Monodentate Ligands and Edge-Bridging Bidentate Ligands

    pág. 2210

    

  • Tetrakis[(4S)-4-phenyloxazolidin-2-one]dirhodium(II) and Its Catalytic Applications for Metal Carbene Transformations

    pág. 2227

    

  • X-Ray Molecular Structure of a Red Bilin Derivative from Chlorella protothecoides. 4th Communication on Chlorophyll Catabolism

    pág. 2236

    

  • Homogeneous Catalysis with Dicationic Pd^I^I Complexes: Aldol Reaction of Methyl Isocyanoacetate with Benzaldehyde

    pág. 2239

    

  • Stabilizing Effect by Geminal Dioxy Substitution and Anomeric Effect in 3,6-Dihydro-6-methoxy-1,2-oxathiin 2-Oxides

    pág. 2250

    

  • Synthesis, Structure, and Reactivity of Secosteroids Containing a Medium-Size Ring. Part 35. Photooxidations of Some (Z)- and (E)-1(10)-Unsaturated 5,10-Secosteroids in Acetone Solution

    pág. 2254

    

  • Stereoselectivity in Reactions of Metal Complexes. Part XVII. Synthesis of Three New Optically Active Triamines: 2,6-Bis{[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]methyl}pyridine, 2,6-Bis{[(2S)-2-(methoxymethyl)pyrrolidin-1-yl]methyl}pyridine, and 2,6-Bis{{(2S)-2-[(benzyloxy)methyl]pyrrolidin-1-yl}methyl]}pyridine. X-Ray Structure and Equilibrium Behaviour of Their Copper(II) Complexes

    pág. 2263

    

  • Tritium Labelling of Naltrindole, a ë-Receptor-Selective Opioid Antagonist via 1-Bromonaltrexone

    pág. 2274

    

  • Investigation of an Olfactoryly Active Ring-Like Conformer of a Chain-Type Odorant, (3S)-3,7-Dimethyloctanal, by Computer Calculation and Graphics

    pág. 2279

    

  • Structural Investigations of 13-O-Demethyl-FK506 and Its Isomers Generated by in vitro Metabolism of FK506 Using Human-Liver Microsomes

    pág. 2288

    

  • Lacton-Bildung durch Ringerweiterung unter Alkalimetall-halogenid-Katalyse

    pág. 2303

    

  • Self-Replication of Oligonucleotides in Reverse Micelles

    pág. 2313

    

  • Ring-Transformation bei der Umsetzung von 3-(Dimethylamino)-2,2-dimethyl-2H-azirin mit 1-substituierten Imidazolidin-2,4,5-trionen

    pág. 2321

    

  • Rhodium(I)-Catalyzed `Metallo-Ene' Cyclizations/á-Eliminations

    pág. 2329

    

  • The Homoconjugated Electron-Releasing Carbonyl Group of 1-Methylbicyclo[2.2.1]hept-5-en-2-one. Regioselective Syntheses of 5-Chloro- and 6-Chloro-1-methylbicyclo[2.2.1]hept-5-en-2-one

    pág. 2338

    

  • Synthesis and Ruthenium-Catalyzed Enantioselective Hydrogenation of 3-O-Substituted 1,3-Dihydroxypropan-2-ones. Part 2

    pág. 2344

    

  • Molecular Geometries by the Extended-Hueckel Molecular Orbital Method III: Band-Structure Calculations

    pág. 2350

    

  • 2-(Tributylstannyl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-indole: Synthesis and Use as a 1H-Indol-2-yl-Anion Equivalent

    pág. 2356

    

  • Synthesis and Characterization of (5'-Deoxyadenosin-5'-yl)cobalamin (=`Adenosylcobalamin') Analogues Mimicking the Transition-State Geometry of Coenzyme-B~1~2-Dependent Rearrangements

    pág. 2367

    

  • Refined Insight in Stereochemical and Directional Features of the Fe^I-Mediated Dehydrogenation of Tetralin

    pág. 2384

    

  • 8-Aza-2'-deoxyguanosine and Related 1,2,3-Triazolo[4,5-d]pyrimidine 2'-Deoxyribofuranosides

    pág. 2388

    

  • Ringerweiterung von sechs- zu neungliedrigen Heterocyclen: Umsetzung von 3-(Dimethylamino)-2,2-dimethyl-2H-azirin mit 3,4-Dihydro-2H-1,2,4-benzothiadiazin-3-on-1,1-dioxiden

    pág. 2398

    

  • Synthesen und Untersuchungen von [Oxazolo[2,3-a]isoindol-9b(2H)-yl]phosphonaten und -phosphinaten: eine neue Klasse von Heterocyclen

    pág. 2407