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  • 1
    Digitale Medien
    Digitale Medien
    Synthesis and Structure of the First Alkyl-Bridged Double Ladder: {[R(Cl)Sn(CH2)3Sn(Cl)R]O}4 (R = Me3SiCH2) (1994)
    s.l. : American Chemical Society
    Organometallics 13 (1994), S. 4121-4123 
    Details
    ISSN: 1520-6041
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/om00022a060
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  • 2
    Digitale Medien
    Digitale Medien
    Two strained hexahelicenophanes (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 684-686 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The crystal structures of the [6]helicenes 4,13-(1,10-decamethylenedioxy)hexahelicene, C36H34O2, (I), and 4,13-(1,8-octamethylenedioxy)hexahelicene, C34H30O2, (II), show strong steric interactions between the terminal benzene rings and the polymethylenedioxy chains. The shortest ring A and F distances amount to 2.941 (3) and 2.902 (3) Å, respectively. The increased steric energy of the ground state is responsible for a significantly lower racemization barrier of (I) and (II) in comparison to the unsubstituted [6]helicene.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270100003140
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  • 3
    Digitale Medien
    Digitale Medien
    (η2-Allylammonium)aquabis(sulfamato-N)copper(I) (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 151-153 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The CuI atom in the title complex, [Cu(NH2SO3)2(C3H8N)(H2O)], is coordinated by the C=C bond of the allylammonium cation, two N atoms of the sulfamate anions and the O atom of the H2O molecule in the apical position. Thus, the central atom is in a distorted trigonal–pyramidal environment. Strong N—H...O and O—H...O contacts connect separate moieties of the complex into a three-dimensional framework. The title compound is representative of hitherto unknown copper(I)–sulfamate π-complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270100016218
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  • 4
    Digitale Medien
    Digitale Medien
    Ethanedithiol diacetate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o330-o331 
    Details
    ISSN: 1600-5368
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Ethane-1,2-diyl S,S′-bis(thioacetate), H3CC(O)SCH2CH2SC(O)CH3 or C6H10O2S2, forms centrosymmetric molecules in the solid state and the molecular structure determined by X-ray crystallography is in good agreement with that obtained by density functional geometry optimization. The planarity of the O=C—S—C fragment, which is also found in structures of other thioacetates, is attributed to a strong np(S)–π*(C—O) orbital interaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S1600536801004408
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  • 5
    Digitale Medien
    Digitale Medien
    Synthesis of the Racemates of the b-Carboline Alkaloid Chrysotricine and its Diastereomer (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 383-392 
    Details
    ISSN: 1434-4475
    Schlagwort(e): Keywords. Alkaloids; β-Carboline; Chrysotricine; Hydroborations.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary.  The racemates of the rubiacea alkaloid Chrysotricine (1) and its diastereomer are synthesized from the isomeric mixture of linalyl oxides 3 and tryptamine in six steps, followed by separation of the diastereomers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007060050319
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  • 6
    Digitale Medien
    Digitale Medien
    Synthesis, Spectroscopic Characterization, and Crystal Structure Determination of Cationic [(Cyclopentadienyl)dicarbonyliron](alkynyl)-aminocarbene Complexes (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 937-944 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Iron acyl complexes ; (Alkynyl)carbene ligand ; Cationic aminocarbene complexes ; Iron (2-methoxyvinyl)aminocarbene complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: (Alkynoyl)iron complexes 1, Cp(CO)2Fe(O=CC≡CR) (R = CH3, Ph, SiMe3), were synthesized by applying a mixed anhydride procedure and transformed into the cationic methoxycarbene complexes 2, [Cp(CO)2 Fe(C(OMe)C≡CR)+]-[PF6-]. Primary amines H2NR′ react with the methoxycarbene complexes to furnish exclusively cationic aminocarbene complexes 3, [Cp(CO)2 Fe(C(NHR′)C≡CR)+][PF6-], or (2-methoxyvinyl)aminocarbene complexes 5. The spectroscopic properties of the new complexes are discussed. The (alkynyl)-aminocarbene complexes 3e and 3f were characterized by X-ray crystal structure analysis.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19961290810
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  • 7
    Digitale Medien
    Digitale Medien
    Formation of the Cationic [(2-Aminoethenyl)carbine]iron Complexes by Treatment of (2-Methoxyethenyl)carbene Complexes with Primary Amines:Synthesis and Characterisation (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1647-1654 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Iron ; Carbene complexes ; (2-Methoxythenyl)methoxycarbene complexes ; Aminolysis ; (2-Aminoethenyl) methoxycarbene complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Cationic (2-methoxyethenyl)methoxycarbene iron complexes 2, [Cp(CO)2Fe(C(OMe)CH=CR(OMe))+][PF6-], are obtained by the addition of methanol to the corresponding (alkynyl)-methoxycarbene complexes 1, [Cp(CO)2Fe(C(OMe)C≡CR)+][PF6-]. Primary amines, H2NR', react with these 1,3-dimethoxy-substituted (alkenyl)carbene complexes, 2, through an addition/elimination process to yield cationic (2-aminoethenyl)methoxycarbene iron complexes, 3, [Cp(CO)2Fe(C(OMe)CH=CR(NHR'))+][PF6-] in an isolated yield of 71-90%. The complexes 3a-c were characterized by X-ray structural analyses. Thus, previously isolated products, from the reaction, of the (alkynyl)methoxycarbene complexes 1a and 1c, with aniline at room temperature, are assigned to the structures 3c and 3e. The spectroscopic and structural data obtained are discussed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19971301115
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  • 8
    Digitale Medien
    Digitale Medien
    Triphenanthro-anellierte [18]Annulene mit Alkoxy-Seitenketten  -  Eine neue Klasse discotischer Flüssigkristalle (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1735-1745 
    Details
    ISSN: 0009-2940
    Schlagwort(e): [18]Annulenes ; Liquid crystals, discotic ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Triphenanthro-Anellated [18]Annulenes with Alkoxy Side Chains - A Novel Class of Discotic Liquid CrystalsTwo different types 6 and 16 of [18]annulenes condensed with phenanthrene systems were prepared by cyclocondensation reactions (Schemes 2 and 3). The central 18-membered rings do not show a macrocyclic diamagnetic ring current. Conformational analyses and X-ray analyses in the solid state reveal non-planar structures in which aromatic “islands” are connected by (E)-configurated olefinic bridges. The introduction of long alkoxy side chains yields a new class of discotic liquid crystals; either ND or hexagonal columnar phases are generated, which were characterized by DSC, microscopy with polarized light, and small-angle scanning X-ray.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19941270925
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  • 9
    Digitale Medien
    Digitale Medien
    Synthesis of a Tetraazido-Substituted 2-Tetrazene from 1,5-Cyclooctadiene and Iodine Azide (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 409-412 
    Details
    ISSN: 0947-3440
    Schlagwort(e): Azides ; Azirines ; Tetrazenes ; 15N-NMR spectroscopy ; Nitrogen heterocycles ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In contrast to the addition of iodine azide to cyclooctene (1) or 1,3-cyclooctadiene (5), its reaction with 1,5-cyclooctadiene (12) leads mainly to the surprisingly stable tetraazido-substituted 2-tetrazene 14 The structure of this was established by 15N-NMR studies and an X-ray structural analysis. Treatment of 14 with hydrochloric acid yields the diazido-substituted 9-azabicyclo[3.3.1]nonane 20.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.199719970219
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  • 10
    Digitale Medien
    Digitale Medien
    Phenylethynyl- and Phenylethenylmetacyclophanes with π,π Interactions (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 791-795 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Cyclophanes ; Sulfur heterocycles ; Cyclisations ; Cesium effect ; ππ* transitions ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: -Two series of [8]metacyclophanes with cis or trans configurated double bonds or triple bonds in the bridges were prepared; the first series 6, 8, and 10 contains phenylethynyl, the second series 13, 14, and 15 phenylethenyl substituents so that ππ interactions between the π centres in the bridge and the π centres of the basic chromophores tolan and trans-stilbene, respectively, can be studied.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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