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  • 1
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Organic compounds-Synthesis. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (321 pages)
    Ausgabe: 1st ed.
    ISBN: 9783642731969
    DDC: 547.050459
    Sprache: Englisch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Carbon compounds. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: With contributions by numerous experts.
    Materialart: Online-Ressource
    Seiten: 1 online resource (234 pages)
    Ausgabe: 1st ed.
    ISBN: 9783540494515
    Serie: Topics in Current Chemistry Series ; v.201
    Sprache: Englisch
    Anmerkung: Intro -- Carbon Rich Compounds II Macrocyclic Oligoacetylenes and Other Linearly Conjugated Systems -- Volume Editor -- Preface -- Contents -- Macrocyclic Structurally Homoconjugated Oligoacetylenes: Acetylene- and Diacetylene-Expanded Cycloalkanes and Rotanes -- Introduction -- [n]Pericyclines -- Synthetic Routes to [n]Pericyclines -- En Route to Perspirocyclopropanated [n]Pericyclines -- Heterocyclic Analogues of [n]Pericyclines -- Structural Features of [n]Pericyclines and the Quest for Homoconjugation as well as Homoaromaticity -- Chemical Properties of [n]Pericyclines and Analogues -- Acetylene-Expanded [n]Pericyclines and Butadiyne- Expanded [n]Rotanes -- Synthetic Routes to Expanded [n]Pericyclines and Butadiyne-Expanded [n]Rotanes -- Mixed Oligoyne-Diyne Macrocycles -- Structural Features and the Quest for Homoconjugation in Expanded [n]Pericyclines and "Exploded" [n]Rotanes -- Thermodynamic Stabilities and Chemical Transformations -- Perspectives -- References -- Cyclic and Linear Acetylenic Molecular Scaffolding -- Introduction -- The Cyclo[n]carbons -- Theoretical consideration -- The Transition-Metal Route to Cyclocarbons -- The Carbon Oxide Route to Cyclocarbons -- Cycloreversion Routes to Cyclocarbons -- Cyclo-C18 by Retro-Diels-Alder Reaction -- Cyclocarbons by [ 2 + 2] Cycloreversion -- Tetraethynylethene (TEE)molecular scaffolding -- Macrocyclic TEE Architecture -- Perethynylated Dehydroannulene -- Perethynylated Expanded Radialenes -- Molecular Wires: Oligomers and Polymers with the Poly(triacetylene) (PTA) Backbone -- Donor-Acceptor Substituted Tetraethynylethenes -- Preparation, Physical Properties, and Photochemical trans®cis Isomerization -- Structure-Property Relationships in Nonlinear Optical Tetraethynylethenes -- Conclusions -- References -- Macrocyclic Oligo(phenylacetylenes) and Oligo(phenyldiacetylenes). , Introduction -- Historical Perspectives -- Phenylacetylenes -- Ortho -- Meta -- Para -- Mixed -- Phenyldiacetylenes -- Ortho -- Meta -- Para -- Mixed -- Phenyltriacetylenes -- Phenyltetraacetylenes -- Phenyloligoacetylenes -- Conclusion -- References -- Note Added in Proof -- Carbon-Rich Molecular Objects from Multiply Ethynylated < -- pi> -- -Complexes -- Introduction -- Syntheses of Diethynylated p-Complexes -- Cyclopentadienyl Complexes -- Cyclobutadiene Complexes -- Linear Oligomers and Homopolymers -- Star-Shaped Perethynylated p-Complexes -- Stepwise Construction of Tetraethynylated Cyclobutadienes -- The One-Pot Procedure to Perethynylated p-Complexes -- Stability Considerations -- Novel Organometallic Dehydroannulenes [42] -- Syntheses -- Coupling Propensities of Diethynylated p-Complexes -- Conclusions -- Acknowledgments -- References -- Oligo- and Polyarylenes, Oligo- and Polyarylenevinylenes -- Introduction -- Oligo- and Polyarylenes -- Oligo- and Poly(para-phenylene) -- Ladder-Type Oligo- and Poly(para-phenylene)s -- Phenylene-Type Dendrimers and Hyperbranched Polymers -- Other Oligo- and Polyarylenes -- Oligo- and Polyarylenevinylenes -- Poly(para-phenylenevinylene)s via Polymerization Methods -- Oligo- and Polyphenylenevinylenes via Polycondensation Methods -- Other Oligo- and Polyarylenevinylenes -- Ladder-Type Poly(para-phenylene-cis-vinylene)s -- Conclusion -- References -- Author Index Volume 201.
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  • 3
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Carbon compounds. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (238 pages)
    Ausgabe: 1st ed.
    ISBN: 9783540696919
    Serie: Topics in Current Chemistry Series ; v.196
    DDC: 546.6812
    Sprache: Englisch
    Anmerkung: Intro -- Carbon Rich Compounds I -- Volume Editors -- Preface -- Contents -- Design of Novel Aromatics Using the Loschmidt Replacement on Graphs -- Introduction -- Nature of the Graph -- From Graph to Molecule by Loschmidt Replacement -- Linear and Branched Structures -- Monocyclic Structures -- Polycyclic Structures -- Platonic Structures -- Topological Structures -- Extending the Point Replacement Idea: Bigraphs -- Conclusions -- References -- Modern Routes to Extended Aromatic Compounds -- Introduction -- Synthesis of PAHs by Thermal Conversions -- Cyclodehydrogenation and Related Reactions -- Sulfone Pyrolysis -- Carbene Insertion Reactions -- Thermal Rearrangements of Carbon Skeletons -- Photocyclization Reactions of Stilbene Type Compounds -- Aryl-Aryl Coupling and Condensation Reactions -- Reductive Coupling Reactions -- Aryl-Aryl Coupling Reactions -- Additional Reductive Coupling Reactions for the Synthesis of PAHs -- Oxidative Aryl-Aryl Coupling and Condensation Reactions -- Intermolecular Reactions -- Intramolecular Reactions -- Intermolecular Cross Coupling Reactions between Aromatic Electrophiles and Nucleophiles -- Oxazoline Coupling (Meyer's Coupling) -- Transition Metal Catalyzed Grignard Coupling Reactions -- Suzuki and Stille Coupling -- Silicon Reagents -- Heck-Type Reactions -- [2 + 2 + 2] Cyclotrimerization Reactions of Alkynes and Arynes -- Modern Diels-Alder Reactions -- Directed Electrophilic Cyclization Reactions -- Miscellaneous -- Centrohexaindane -- Anions of PAHs as Synthetic Precursors -- Ring Transformations of Heterocyclic Compounds -- The Dötz Reaction -- References -- Carbon Rich Cyclophanes with Unusual Properties - an Update -- Introduction -- Unusual Molecules with Cyclophane Substructures -- Extended Orthogonal p-Systems -- Rigid Ladder Polymers with [2.2]Paracyclophane Subunits. , Cyclophynes and Other Large Cyclophanes -- Belt- and Cage-shaped Cyclophanes -- Short-Bridge and Strained Cyclophanes -- Cylophanes as Ligands for Metal-Ion Coordination -- Platinum and Zirconium Complexes of [2.2]Paracyclophane-1-yne -- Oligonuclear Metal Complexes with Cyclophane Ligands -- Chiral Cyclophanes as Auxiliaries and Ligands for Asymmetric Catalysis -- Cyclophanes in Photochemistry -- Double-Layered Chromophores Derived from [2.2]Paracyclophane -- Topological Reaction Control in Solution -- Photolysis of [2.2]Paracyclophane-1,10-dione -- Perspectives -- References -- Unsaturated Oligoquinanes and Related Systems -- Introduction -- Fulvene (C6H6) and Related Systems -- Fulvene and Substituted Fulvene Hydrocarbons -- Heteroanalogous Fulvene Derivatives -- Pentalene (C8H6) and Related Systems -- Pentalene and Substituted Pentalene Hydrocarbons -- Dilithium Pentalenediide -- Pentalene Metal Complexes -- Acepentalene (C10H6) and Related Unsaturated Triquinane Derivatives -- Triquinacene (C10H10) and Related Systems -- Azatriquinacene (C9H9N) -- Potential Acepentalene Precursors and the Elusive Acepentalene -- Generation of Acepentalene (C10H6) -- Dilithium Acepentalenediide and Other Metal Complexes of Acepentalene -- Dicyclopenta[cd,gh]pentalene (C12H6) and Related Systems -- Dicyclopenta[cd,gh]pentalene and Other Unsaturated Tetraquinanes -- Octahedrane (C12H12) -- Higher Unsaturated Oligoquinanes -- Unsaturated C20-Dodecahedranes -- References -- The Centropolyindanes and Related Centro-Fused Polycyclic Organic Compunds -- Introduction -- Indane as a Building Block for Three-Dimensional Ring Systems -- Regular Centropolyindanes -- Irregular Centropolyindanes -- A Contrast: Polyindanes with Planar or Quasi-Planar Frameworks -- Diindanes: Recent Advances -- Centrotriindanes and Related Systems. , Mono-fuso-centrotriindanes: Triptindanes and Related Benzoannelated Propellanes -- Di-fuso-centrotriindanes and Their Derivatives -- Tri-fuso-centrotriindanes: Tribenzotriquinacenes, Tribenzodihydroacepentalenes and Related Polycycles -- Centrotetraindanes -- Tri-fuso-centrotrindane -- Tetra-fuso-centrotetraindane (Fenestrindane) and Related Benzoannelated Fenestranes -- Bridgehead-Substituted Fenestrindanes -- Centropentaindane -- Centrohexaindane -- Miscellaneous Derivatives of Centropolyindanes -- Conclusion -- References -- Author Index Volumes 151-196.
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  • 4
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Chemistry. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (236 pages)
    Ausgabe: 1st ed.
    ISBN: 9783540482550
    Serie: Topics in Current Chemistry Series ; v.207
    Sprache: Englisch
    Anmerkung: 207 Topics in Current Chemistry -- Small Ring Compounds in Organic Synthesis VI -- Copyright -- Preface -- Contents -- Cyclopropane Derivatives and their Diverse Biological Activities -- Transition Metal Promoted Ring Expansionof Alkynyl- and Propadienylcyclopropanes -- Bicyclopropylidene - A Unique Tetrasubstituted Alkene and a Versatile C6-Building Block -- Alkyl 2-Chloro-2-cyclopropylideneacetates-Remarkably Versatile Building Blocks for Organic Synthesis -- Author Index Volume 201-207.
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 968-969 
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The central three-membered ring in the title compound, trans-1,1′,1′′-cyclopropane-1,2,3-triyltris(cyclopropanol), C12H18O3, shows pronounced asymmetry of the bond lengths, which is induced by the different orientations of the substituents. A network of hydrogen bonds links the molecules into sheets.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2051-2065 
    ISSN: 0009-2940
    Schlagwort(e): Chromium, alkynylcarbene complexes ; Vinylcarbenechromium complexes, β-donor-substituted ; Carbene complexes, vinyl, chelated ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: β-Donor-substituted α,β-unsaturated chromium carbene complexes (CO)5CrC(OEt)C = CR(XR′n) (X = N, O, S; 3, 9, 11-16, 22-25) have been synthesized by Michael addition of amines, alcohols, and thiols to alkynylcarbene complexes (CO)5CrC-(OEt)C≡CR (1). The configurations of the newly formed C-C double bonds have been determined by NOE/NOESY measurements and X-ray crystal structure analysis. These vinylcarbene complexes lose one carbonyl ligand in refluxing tetrahydrofuran to give tetracarbonyl complexes (CO)4CrC(OEt)C = CR(XR′n) (X = N, O, S; 26-28).
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2531-2534 
    ISSN: 0009-2940
    Schlagwort(e): [2.2]Paracyclophanes ; 1,2-Dibromoarenes ; anti-[2.2]Paracyclophanes ; Aryne generation ; Diels-Alder reactions ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The reaction of 2 with nBuLi at -78°C generates aryne intermediates within the aromatic rings of [2.2]paracyclophane which are trapped in Diels-Alder reactions with dienes like furan, 1,9-diphenylisobenzofuran, or cyclopentadiene. Reductive deoxygenation with low-valent titanium reagents or TMSI converts the adducts of furan and isobenzofuran into anti-[2.2]paracyclophanes 4 and 5, respectively. The reaction of two aryne intermediates with [2.2](2,5)furanophane (7) yields 8 with three [2.2]paracyclophane units arranged in a stair-like fashion; yet, in this compound the highly shielded oxygen atoms cannot be removed anymore by reduction.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    ISSN: 0009-2940
    Schlagwort(e): Chromium, (β-aminoethenyl)carbene complexes ; 1-Aza-1,3-butadienes, coordinated ; Pyridines, cycloaddition with alkynes ; Chelated chromium complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: [(β-Aminoethenyl)carbene]chromium complexes 3a-c rearrange to coordinated 1-aza-1,3-butadienes 6a-c, which undergo cycloadditions with alkynes 7a, c to pyridines 9a, 10a-c.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    ISSN: 0009-2940
    Schlagwort(e): Cyclopropenes, 3,3-dimethyl, 1-substituted ; Cyclopropenylzinc chlorides, coupling reactions of ; Palladium catalysis ; Cyclopropenylstannanes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: [3,3-Dimethyl-2-(trimethylsilyl)-1-cyclopropen-1-yl]zinc chloride (4) reacts with haloarenes and -alkenes as well as 1-bromo-acetylenes under Pd(0) catalysis to give the corresponding 1-phenyl-, 1-ethenyl-, and 1-ethynyl-1-cyclopropenes 6 in isolated yields ranging from 47 to 99%. The corresponding 1-cyclopropen-1-ylstannane 5 reacts with haloarenes only at higher temperatures, and the yields range from 10 to 98%, depending on the substrate and reaction conditions.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 10
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: On the Mechanism of the Thermal Rearrangement of Bicyclo[2.2.0]hexane: Dispiro[cyclopropane-1,2′-bicyclo[2.2.0]hexane-3′,1′′-cyclopropane] and Analogously Substituted Derivatives as New Model CompoundsUpon thermolysis the 2,3-diazabicyclo[2.2.2]oct-2-enes 10a-c yield only the thermodynamically more stable 1,5-hexadienes, namely 11, 13, and 15, respectively. Upon photolysis, however, remarkable proportions of the new bicyclo[2.2.0]hexane derivatives 2 (66%), 4 (29%), and 3 (58%), respectively, are formed besides the hexadienes; the by-product (2%) from 10a most probably is the hexalin 12, as it would arise from an intermediate diradical by neighboring group participation of both three-membered rings. The thermolyses of 2, 3, and 4 follow first order rate laws and yield 11, 13, and 15. According to the kinetic data, which best fit a two-step mechanism, the diradical from 2 is stabilized purely electronically by 25.8 kJ/mol with respect to the diradical from 4.
    Notizen: Die 2,3-Diazabicyclo[2.2.2]oct-2-ene 10a-c ergeben bei der Thermolyse nur das jeweils thermodynamisch stabilere 1,5-Hexadien, nämlich 11, 13 bzw. 15. Bei der Photolyse entstehen daneben in beachtlichen Anteilen von 66, 29 und 58% die neuen Bicyclo[2.2.0]hexan-Derivate 2, 4 bzw. 3; dem Nebenprodukt (2%) aus 10a kommt höchstwahrscheinlich die Konstitution des Hexalins 12 zu, wie es aus einem intermediären Diradikal durch Nachbargruppenbeteiligung der beiden Dreiringe entstehen müßte. Die Thermolyse von 2, 3 und 4 folgt Zeitgesetzen 1. Ordnung und führt zu 11, 13 und 15. Nach den kinetischen Daten, die am besten mit einem zweistufigen Verlauf zu vereinbaren sind, ist das 1,4-Diradikal aus 2 gegenüber dem aus 4 rein elektronisch um 25.8 kJ/mol stabilisiert.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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