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  • Chemistry  (91)
  • Life and Medical Sciences  (21)
  • Cell & Developmental Biology  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Folgeprodukte halogenierter Aldehyde. XIV [1]. Synthesen mit 1,2,2,2-Tetrachlorethylisocyanat (1978)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 625-633 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Derivatives of Halogenated Aldehydes. XIV. Reactions of 1,2,2,2-Tetrachloroethyl Isocyanate1,2,2,2-Tetrachloroethyl isocyanate 2 reacts with alcohols or phenols to form the N-tetrachloroethyl-O-alkyl(aryl) urethanes 3-6. With thioalcohols and thiophenols the corresponding thiourethanes 11-12 are obtained. In these compounds the chlorine in position 1 can be substituted by treatment with a nucleophilic compound in the presence of a base by way of an elimination addition mechanism. In these reactions the compounds 7-10 and 13-14 are formed. Amines attack 2 at both active centres to give the substituted ureas 15-18. Diphenyl amine, some carboxylic acid amides and benzazoles, however, react only with the isocyanate group to form the compounds 19-25. Reactions of 2-amino-benzazoles, 2-amino-pyridine and amidines with 2 yield the heterocyclic compounds 26-31.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19783200416
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  • 2
    Electronic Resource
    Electronic Resource
    Stabile Quecksilber(I)-Selen-Verbindungen, 1. Synthese und Struktur des Tetrakis(diphenylseleno)diquecksilber(I)-diperchlorats, Synthese von Bis(diphenylseleno)diquecksilber(I)-dinitrat (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3291-3296 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Mercury(I)-Selenium Compounds, 1. Synthesis and Structure of Tetrakis(diphenylseleno)dimercury(I) Diperchlorate, Synthesis of Bis(diphenylseleno)dimercury(I) DinitrateThe new compounds 1 and 2 have been prepared by the reaction of diphenyl selenide with mercury(I) nitrate or perchlorate in methanolic solution. As shown by an X-ray analysis the structure of compound 1 contains the groups [(C6H5)2Se]2Hg-Hg[Se(C6H5)2]2 and O-coordinated ClO4⊖-anions. Compound 2 contains only 2 mol of diphenyl selenide for 1 mol of Hg2(NO3)2.
    Notes: Durch Umsetzung methanolischer Lösungen von Quecksilber(I)-nitrat bzw. -perchlorat mit Lösungen von Diphenylselenid in Methanol wurden die neuen Verbindungen 1 und 2 dargestellt. Nach röntgenographischen Untersuchungen liegen in 1 die Gruppen [(C6H5)2Se]2Hg—Hg[Se(C6H5)2]2 neben über ein O-Atom koordinierten ClO4⊖-Anionen vor. Die Verbindung 2 enthält nur 2 mol Diphenylselenid auf 1 mol Hg2(NO3)2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101007
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  • 3
    Electronic Resource
    Electronic Resource
    Acid-catalyzed Cyclization of the Ene-Product Derived from α-Pinene and PTAD (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1977-1979 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Säurekatalysierte Cyclisierung des En-Produkts aus α-Pinen und PTADAluminiumchlorid-katalysierte Reaktion des En-Produkts 2 aus 4-Phenyl-4H-1,2,4-triazol-3,5-dion (PTAD) und α-Pinen (1), des 1-(6,6-Dimelthyl-2-methylenbicyclo[3.1.1]hept-3-yl)-4-phenyl-1,2,4-triazolidin-3,5-dions, ergab 3,8,8-Trimelthyl-N-phenyl-4,5-diazatricyclo[4.2.1.03,7]nonan-4,5-dicarboxamid (6) in 78% Ausbeute. Auch Bortrifluorid-etherat, trockener Chlorwasserstoff und p-Toluolsulfonsäure katalysieren die Cyclisierung von 2 zu 6, aber nicht in diesem Maße. Der Mechanismus der Cyclisierung wird über eine Gerüstumlagerung der Carbenium-Ionen-Zwischenstufen gedeutet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170527
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen über den Kork I (1927)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 10 (1927), S. 346-374 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19270100141
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  • 5
    Electronic Resource
    Electronic Resource
    Cycloaddition of Singlet Oxygen and 4-Methyl-4H-1,2,4-triazole-3,5-dione to 7-Adamantylidene-1,3,5-cycloheptatriene and Derivatives (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2393-2408 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition von Singulettsauerstoff und 4-Methyl-4H-1,2,4-triazol-3,5-dion an 7-Adamantyliden-1,3,5-cycloheptatrien und Derivate7-Adamantyliden-1,3,5-cycloheptatrien (18) wurde mittels Thermolyse des Thietans 22 hergestellt, welches wiederum durch Cycloaddition von 2-Adamantanthion mit 8-Oxoheptafulven (1) erhalten wurde. In dieser Reaktion wurde zusätzlich das Thiophen 23 erzeugt, anscheinend durch [8 + 2]-Cycloaddition. Die Addition von Singulettsauerstoff (1O2) an Heptafulven 18 führte zum [4 + 2]-Tropiliden-endoperoxid 24, während mit 4-Methyl-4H-1,2,4-triazol-3,5-dion (MTAD) das [8 + 2]-Urazol 26 gebildet wurde. Singulettsauerstoff-Addition an Thietan 22 ergab das [4 + 2]-Tropiliden-endoperoxid 27, aber mit MTAD wurde das gespannte [4 + 2]-Norcaradien-urazol 28 erhalten. Das Thiophen 23 führte mit 1O2 und mit MTAD zu den [4 + 2]-Norcaradienprodukten 29 bzw. 30, wovon die Struktur von 30 durch Röntgenstrukturanalyse ermittelt wurde.
    Notes: 7-Adamantylidene-1,3,5-cycloheptatriene (18) was prepared via thermolysis of the thietane 22, produced in the cycloaddition of 2-adamantanethione with 8-oxoheptafulvene (1). The latter reaction also afforded the thiophene 23, presumably via [8 + 2]-cycloaddition. Reaction of singlet oxygen (1O2) with heptafulvene 18 gave the [4 + 2]-tropilidene endoperoxide 24, while 4-methyl-4H-1,2,4-triazole-3,5-dione (MTAD) led to the [8 + 2]-urazole 26. Singlet oxygenation of thietane 22 produced the [4 + 2]-tropilidene endoperoxide 27, but with MTAD the strained [4 + 2]-norcaradiene urazole 28 was obtained. The thiophene 23 gave with 1O2 and MTAD the [4 + 2]-norcaradiene products 29 and 30, respectively. X-ray analysis confirmed the urazole 30 structure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170711
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  • 6
    Electronic Resource
    Electronic Resource
    ansa-Titanocene and -Zirconocene η2-Alkyne Complexes -Synthesis, Spectral Characteristics, and X-ray Crystal Structure (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 959-962 
    Details
    ISSN: 0009-2940
    Keywords: ansa-Zirconocenes ; ansa-Titanocenes ; Alkyne complexes ; Pyridine ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reduction of the complex [(η5-C5H4)-ansa-(η5-C5H4)]TiCl2 with magnesium in the presence of Me3SiC2-SiMe3 in THF at room temperature gives the ansa-titanocone alkyne complex [(η5-C5H4)-ansa-(η5-C5H4)]Ti(η2-Me3SiC2-SiMe3) (ansa = Me2Si-O-SiMe2, 1). The similar pyridine-stabilized zirconium complexes could be obtained by analogous reactions and addition of pyridine: [(η5-C5H4)-ansa-(η5-C5H4)]Zr(L)(η2-Me3SiC2SiMe3) (ansa = Me2Si-O-SiMe2, L = pyridine: 2; ansa = SiMe2, L = pyridine: 3). All complexes were characterized by spectroscopic methods. An X-ray structure determination of complex 3 was conducted, and the data were compared to those of the complexes rac-(EB-HI)Zr(L)(η2-Me3SiC2SiMe3) [L = (S)-(-)-nicotine: 6, EBHI = ethylenebis(tetrahydroindenyl)] and Cp2Zr(py)(Me3SiC2-SiMe3).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290813
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  • 7
    Electronic Resource
    Electronic Resource
    The First Titanacyclic Five-Membered Cumulene. Synthesis, Structure, and Reactivity (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 967-971 
    Details
    ISSN: 0009-2940
    Keywords: Titanocene ; Diyne ; Cumulene ; Titanacyclopentadiene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first five-membered titanacyclic cumulene (5) was prepared by treatment of the titanocene generator Cp2Ti(Me3SiC2SiMe3) with the di-tert-butylbutadiyne in a molecular one-to-one ratio. The reaction of 5 with “Cp2Zr” or of the analogous complex with “Cp2Ti” leads to cleavage of the central C-C bond in the metallacyclocumulene complexes to afford the same product, the heterodimetallic ρ, π,-alkynyl-bridged titanocene-zirconocene complex Cp2Zr(μ-η1η2-C≡CtBu)Cp2Ti(μ-η1η2-C≡CtBu) (6), in which each alkynyl group is π-bonded to one and π-bonded to the other metal as shown by X-ray diffraction studies. In solution the two alkynyl groups become equivalent. The coupling reaction of “Cp2Ti” with bis(trimethylsilyl)butadiyne in a one-to-two molecular ratio leads to the unsymmetrically substituted titanacyclopentadiene (7).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951281002
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  • 8
    Electronic Resource
    Electronic Resource
    Reactions of Lactams with Titanocene- and Zirconocene-Alkyne Complexes as Elemental Steps in Catalytic Anionic Ring-Opening Polymerization of Lactams (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1281-1285 
    Details
    ISSN: 0009-2940
    Keywords: Zirconocenes ; Titanocenes ; N-Methyl-ε-caprolactam ; β-Propiolactam ; ε-Caprolactam ; Ring-opening polymerization ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Depending on the nature of the metal and the ring size, lactams react with titanocene and zircocene complexes of bis-(trimethylsilyl)acetylene Cp2Ti(Me3SiC2SiMe3) and Cp2Zr-(L)(Me3SiC2SiMe3) (L = Py, THF) to yield different products. In the reaction of Cp2Zr(Py)(Me3SiC2SiMe3) with N-methyl-€-caprolactam a simple ligand exchange reaction occurs and the complex Cp2Zr(Me3SiC2SiMe3)[O=H2)5] (1) was isolated. With β-propiolactam the alkenyl-amido complex Cp2)(SiMe3)][-NH2] (2) was obtained, which indicates that an agostic metal-hydrogen interaction has taken place. The reaction of Cp2Ti(Me3-SiC2SiMe3) with €-caprolactam gives after elimination of the alkyne and molecular hydrogen the first early transition metal complex with a deprotonated coordinated €-caprolactam in a η2-amidate bonding fashion (3). The obtained complexes were characterized by NMR spectra (1, 2) and crystal structure analysis (1-3) and discussed as elemental steps in anionic ring-opening polymerization of lactams catalyzed by metallocene-alkyne complexes.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291022
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  • 9
    Electronic Resource
    Electronic Resource
    Ring-Enlargement and Ring-Opening Reactions of Benzoxazole, Thiazoles, and Benzisoxazole by Zirconocene-Alkyne Complexes (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 207-211 
    Details
    ISSN: 0009-2940
    Keywords: Zirconocene ; Titanocene ; Benzoxazoles ; Thiazoles ; Benzisoxazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zirconocene alkyne complexes Cp2Zr(L)(Me3SiC2R) (L = Py, THF; R = SiMe3 tBu) react with heterocyclic compounds like benzoxazole and related thiazoles to yield ring-expanded adducts (1-3) and (4, 5) by formal C-X (X = O, S) bond cleavage and coupling with the coordinated alkyne. In the case of benziso-xazole, the alkyne is not coupled but eliminated, and with ring-enlargement of the benzisoxazole a N-bridged dimer (6) is formed. The obtained complexes 1, 3, and 6 were characterized by NMR spectra and crystal structure analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290214
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  • 10
    Electronic Resource
    Electronic Resource
    Chemische Synthese einiger im Zuckerteil abgewandelter kürzerer Oligodesoxyribonucleotide (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 793-802 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical Synthesis of Some Shorter Oligodeoxyribonucleotides with Modified Sugar MoietyThe chemical synthesis of the dinucleotides 5′-deoxy-5′-fluoro-thymidyl-(3′ → 5′)-3′-deoxy-3′-fluoro-thymidine, 5′-deoxy-5′-fluoro-thymidyl-(3′ → 5′)-3′-deoxy-3′-azido-thymidine, 2′-deoxy-cytidyl-(3′ → 5′)-3′-deoxy-3′-fluoro-thymidine and the tetranucleotide 2′-deoxy-2′-fluorouridyl-(3′ → 5′)-thymidyl-(3′ → 5′)-thymidyl-(3′ → 5′)-thymidyl-(3′ → 5′)-3′-deoxy-3′-fluoro-thymidine d(2′-F-UpTpTp-3′-F-T) is described both in solution and in the solid phase.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240513
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