Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989  (8)
  • 1955-1959
  • 1987  (8)
Material
Years
  • 1985-1989  (8)
  • 1955-1959
Year
  • 1
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 727-733 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 2-cycloalkyn-1-ylmethanols 17a, b were synthesized to study the solvolysis behavior of their 4-nitrobenzenesulfonic esters 9a and 9b. After having been succeeded in preparing the propargyl acetates 13a, b by oxidation of the cyclic allenes 12a, b with Pb(OAc)4 and subsequently the propargyl bromides 16a, b in preparative scale, the latter were converted to the alcohols 17a, b with zinc and formaldehyde. The solvolyses of 9a, b in solvents of varying ionizing power proceed exclusively with participation of the triple bond. 2-Cyclononyn-1-ylmethyl 4-nitrobenzenesulfonate (9a) reacts to give the cyclopropylidenemethyl cation 21a, which rearrages subsequently to the secondary, ring enlarged cyclic homopropargyl cation 22a and to the 2,3-bridged cyclo-butenyl cation 25a, from which the substitution products 23a and 26a as well as 24a and 28a are obtained. The corresponding homopropargyl alcohol 23b was obtained exclusively from the solvolysis of 2-cyclodecyn-1-ylmethyl 4-nitrobenzenesulfonate (9b) via the cyclic homopropargyl cation 22b.
    Notes: Zur Untersuchung der Solvolysereaktionen der 2-Cycloalkin-1-ylmethyl-4-nitrobenzolsulfonate 9a,b wurden zunächst die 2-Cycloalkin-1-ylmethanole 17a,b synthetisiert. Nachdem es gelungen war durch Oxidation der cyclischen Allene 12a,b mit Pb(OAc)4 die Propargylacetate 13a,b und daraus die entsprechenden Propargylbromide 16a,b im präparativen Maßstab zu gewinnen, wurden diese mit Zink und Formaldehyd in die Alkohole 17a,b übergeführt. Die Solvolysen von 9a,b in Lösungsmitteln unterschiedlicher Ionisierungsstärke verlaufen ausschließlich unter Beteiligung der Dreifachbindung. 2-Cyclononin-1-ylmethyl-4-nitrobenzolsulfonat (9a) reagiert zum Cyclopropylidenmethyl-Kation 21a, das anschließend zu dem sekundären, ringerweiterten cyclischen Homopropargyl-Kation 22a und zum 2,3-überbrückten Cyclobutenyl-Kation 25a umlagert, aus denen die Substitutions-produkte 23a und 26a bzw. 24a und 28a erhalten werden. Bei der Solvolyse von 2-Cyclodecin-1-ylmethyl-4-nitrobenzolsulfonat (9b) wurde über das cyclische Homopropargyl-Kation 22b ausschließlich der entsprechende Homopropargylalkohol 23b erhalten.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1853-1862 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monomeric and Bridged (2,3,9,10-Tetramethyl-1,4,8,11-tetraaza-1,3,8,10-cyclotetradecatetraen)iron(II) Complexes with Diaxial LigandsThe reaction of [FeTIM(CH3CN)2](PF6)2 (5) with mono- and bidentate ligands L, e. g. pyridine (py), substituted pyridines, 4,4′-bipyridine (bpy), 1,4-diisocyanobenzene (dib), pyrazine (pyz), 4-cyanopyridine (4-pyCN), imidazole (imH), 1,2,4-triazole (triH), yields the iron(II) complexes of 2,3,9,10-tetramethyl-1,4,8,11-tetraaza-1,3,8,10-cyclotetradecatetraene (TIM) [FeTIM(L)2](PF6)2 (6a-u). The bridged complexes 8a-e (e. g. [FeTIM(μ-pyz)- (H2O)]n(PF6)2n (8a)) were obtained with the ligands pyz, bpy, dib, 4-pyCN and 4-isocyanopyridine (pyNC). Similarly, with L = imH, triH, and tetrazole (tetH), the bridged complexes 10a-c, e. g. [FeTIM(μ-im)]n(PF6)n (10a), were formed.
    Notes: Durch Umsetzung von [FeTIM(CH3CN)2](PF6)2 (5) mit ein- und zweizähnigen Liganden L, z. B. Pyridin (py), substituierte Pyridine, 4,4′-Bipyridin (bpy), 1,4-Diisocyanbenzol (dib), Pyrazin (pyz), 4-Cyanpyridin (4-pyCN), Imidazol (imH), 1,2,4-Triazol (triH), wurden die monomeren Eisen(II)-Komplexe von 2,3,9,10-Tetramethyl-1,4,8,11-tetraaza-1,3,8,10-cyclotetradecatetraen (TIM) [FeTIM(L)2](PF6)2 (6a-u) erhalten. Mit den Liganden pyz, bpy, dib, 4-pyCN, 4-Isocyanpyridin (pyNC) konnten auch die verbrückten Komplexe 8a-e (z. B. [FeTIM(μ-pyz)- (H2O)]n(PF6)2n (8a)) gewonnen werden. Mit L = imH, triH und Tetrazol (tetH) wurden die verbrückten Verbindungen 10a-c, z. B. [FeTIM(μ-im)]n(PF6)n (10a) erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1659-1666 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Solvolysis of Cyclic Dienynyl TriflatesThe cyclic enyne ketones 7a and 7b are prepared and converted into the corresponding cyclic dienynyl triflates 8a-c. The homologous triflates 8a and 8b solvolyse in trifluoroethanol as well as in ethanol with practically quantitative rearrangement via the intermediate aryl cations 9a and 9b to form the aryl ethers 26a, b and 28a, b, resp., and also with internal ion pair return to the aryl triflates 27a, b. The aryl bromides 30a, b are obtained by the addition of bromide ions.
    Notes: Die cyclischen Enin-ketone 7a und 7b werden dargestellt und in die entsprechenden cyclischen Dieninyl-triflate 8a-c übergeführt. Die homologen Triflate 8a und 8b solvolysieren sowohl in Trifluorethanol als auch in Ethanol unter praktisch quantitativer Umlagerung über die intermediären Arylkationen 9a bzw. 9b zu den Arylethern. 26a, b bzw. 28a, b und unter innerer Ionenpaar-Rückkehr zu den Aryltriflaten 27a, b. Nach Zusatz von Bromid-Ionen werden auch die Arylbromide 30a, b erhalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1255-1256 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reductive Arylation of Vinyl Trifluromethanesulfonates by Friedel-Crafts ReactionThe reaction of vinyl triflates 1 with benzene and toluene in the presence of aluminium trichloride gives alkyl-, alkenyl-, and 1,1-diarylalkanes 5, 6, 3, 9 depending on the structure of the substrate used. A mechanism for the reductive arylation is proposed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1307-1313 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of (Phthalocyaninato)cobalt(II) Adducts with Nitrogen Bases(α-) and (β-phthalocyaninato)cobalt(II) (PcCo) are treated with ligands L=pyrazine (pyz), 4-methylpyrazine (4-mepyz), pyridine (py), pyridine-d5 (py-d5) 4,4′-bipyridine (bpy), and n-butylamine (bu). The PcCo adducts PcCoL obtained (L=pyz, mepyz, me2pyz, Clpyz, py, py-d5, bu); PcCo-L-CoPc (L=bpy), [PcCoL]n (L=pyz); PcCoL2 (L=pyz, py, py-d5, pip, bpy), are characterized by ESR spectroscopy, thermal and magnetic measurements. Pentacoordinated complexes PcCoL are formed preferentially. Hexacoordinated complexes PcCoL2 with L=py, 4-mepy, bpy, pyz, piperidine (pip) are only formed at a high ligand concentration. While the polymer [PcCo(pyz)]n was isolated as a stable compound, attempts to obtain [PcCo(bpy)]n were unsuccessful. With 1,4-diazabicyclo[2.2.2]octane (dabco), a strong σ-donor ligand, [PcCo(dabco)]n is easily formed. In addition, the reaction of PcCo with 1,6-naphthyridine (naph), benzyl isocyanide (bzNC), and 1,4-diisocyanobenzene (dib) was also investigated.
    Notes: (α-) und (β-Phthalocyaninato)cobalt(II) (PcCo) reagiert mit Liganden L=Pyrazin (pyz), 4-Methylpyrazin (4-mepyz), Pyridin (py), Pyridin-d5 (py-d5), 4,4′-Bipyridin (bpy) und n-Butylamin (bu) zu den PcCo-Addukten PcCoL (L=pyz, mepyz, me2pyz, Clpyz, py, py-d5, bu); PcCo-L-CoPc (L=bpy), [PcCoL]n (L=pyz); PcCoL2 (L=pyz, py, py-d5, pip, bpy), welche durch ESR-Spektroskopie sowie durch thermische und magnetische Messungen charakterisiert werden. Bevorzugt werden die pentakoordinierten Komplexe PcCoL gebildet. Hexakoordinierte Komplexe PcCoL2 mit L=py, 4-mepy, bpy, pyz, Piperidin (pip) werden nur bei hoher Ligandenkonzentration erhalten. [PcCo(pyz)]n wird als stabile Verbindung isoliert; Versuche, [PcCo(bpy)]n zu gewinnen, waren nicht erfolgreich. Mit 1,4-Diazabicyclo[2.2.2]octan (dabco), einem vergleichsweise starken σ-Donorliganden, bildet sich die entsprechende verbrückte Verbindung [PcCo(dabco)]n leicht. Zusätzlich werden die Reaktionen von PcCo mit 1,6-Naphthyridin (naph), Benzylisocyanid (bzNC) und 1,4-Diisocyanobenzol (dib) untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...