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  • 1
    Electronic Resource
    Electronic Resource
    Ein Beitrag zum Mechanismus der licht-induzierten Isomerisierungen des 4-Methylenbicyclo[3.1.0]hex-2-en-Systems (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 511-519 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Contribution to the Mechanism of Light-induced Isomerizations of the 4-Methylenebicyclo[3.1.0]hex-2-eneDeuterium-labelling of 1,2,3,5,6-exo-pentamethyl-4-methylenebicyclo[3.1.0]hex-2-ene (exo-1) and 1,2,3,5,6-endo-pentamethyl-4-methylenebicyclo[3.1.0]hex-2-ene (endo-1) was used to get insight into the mechanisms of the reversible photo-isomerization exo-1 ⇌ endo-1 and of their light-induced rearrangements to 1,2,3,4,6-pentamethyl-5-methylene-1,3-cyclohexadiene (2).
    Notes: Durch Verfolgung des Verbleibs von Deuterium im markierten 1,2,3,5,6-exo-Pentamethyl-4-methylenbicyclo[3.1.0]hex-2-en (exo-1) und 1,2,3,5,6-endo-Pentamethyl-4-methylenbicyclo[3.1.0]-hex-2-en (endo-1) wurden Hinweise über die Mechanismen der reversiblen Photo-Isomerisierung exo-1 ⇌ endo-1 und der gleichfalls licht-induzierten Umlagerung dieser Verbindungen zum 1,2,3,4,6-Pentamethyl-5-methylen-1,3-cyclohexadien (2) erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130209
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  • 2
    Electronic Resource
    Electronic Resource
    Modell-untersuchungen zur struktur eines polyimids aus pyromellithsäuredianhydrid und benzidinHerrn Professor Dr. Heinrich Hellmann zum 60. Geburtstag gewidmet (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1383-1394 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: It could be shown by a detailed 1H-NMR-study of suitable model compounds that also in the isolated dissolved molecule of N-phenylphthalimide the nitrogen atom is subject of a stationary sp2-hybridization with strong planar geometry of the three σ-bonds. From this molecular structure it can be concluded, that the polyimide of pyromellitic acid, poly(pyromellitdiimido-4,4′-biphenylylene) (4), must have a strictly linear rod-like structure of the whole macromolecule.
    Notes: Anhand geeigneter Modellverbindungen konnte 1H-NMR-spektroskopisch nachgewiesen werden, daß sich auch am isolierten, gelösten Molekül des N-Phenylphthalimids eine zeitlich stationäre sp2-Hybridisierung mit ebener Anordnung der drei vom Stickstoff ausgehenden σ-Bindungen einstellt. Diese Bindungsverhältnisse haben für das Polyimid der Pyromellithsäure, Poly(pyromellithdiimido-4,4′-biphenylylen) (4), eine streng lineare, stäbchenförmige Struktur des Makromoleküls zur Folge.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750504
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  • 3
    Electronic Resource
    Electronic Resource
    Protonenresonanz-spektroskopische Untersuchungen an Organosilicium-Verbindungen, I. Elektronegativität des Sauerstoffs in den Verbindungen Cln(CH3)3-nSi-O-R (1964)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 97 (1964), S. 2829-2847 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Elektronegativitätswerte des Sauerstoffs gegenüber den Alkylresten R in den Verbindungen Cln(CH3)3-nSi—O—R (R—CH3, CH2CH3, CH2CH2CH3, CH(CH3)2, CH2CH2CH2CH3, CH(CH 3)CH2CH3 und CH(CH3)CH2CH2CH3) wurden bestimmt. Durch Vergleich der inneren und effektiven Elektronegativitäten konnten die Anteile der magnetischen Anisotropie an den chemischen Verschiebungen ermittelt werden. Die Meßwerte werden im Hinblick auf die Bindungseigenschaften in den untersuchten Verbindungen diskutiert.
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19640971013
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  • 4
    Electronic Resource
    Electronic Resource
    Substituenten-Einfluß auf die lichtinduzierte Isomerisierung des Homofulven-Systems: Photo-Isomerisierung des Singulettangeregten 1,2,3,5-Tetramethyl-4-methylen-endo- und-exo-6-(trifluormethyl)bicyclo[3.1.0]hex-2-ens (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 2681-2691 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Influence of Substituents on the Light-Induced Isomerization of the Homofulvene System: Photo-Isomerization of the Singlet Excited 1,2,3,5-Tetramethyl-4-methylene-endo- and -exo-6-(trifluoromethyl)bicyclo[3.1.0]hex-2-eneSyntheses of the diastereomeric pairs 1,2,3,5-tetramethyl-4-methylene-endo- and -exo-6-(trifluoromethyl)bicyclo[3.1.0]hex-2-ene (endo-1d and exo-1d) as well as [6-D]-endo-1d and [6-D]- exo-1d are reported. Following singlet excitation both diastereomers are isomerized to a mixture of 1,2,3,5-Tetramethyl-6-methylene-endo- and -exo-4-(trifluoromethyl)bicyclo[3.1.0]hex-2-ene (endo-7 and exo-7) as well as [4-D]-endo-7 and [4-D]-exo-7. A mechanism for this - from the singlet excited isomerization of the alkyl-substituted homofulvenes different - reaction path is suggested.
    Notes: Die Synthese der Diastereomeren-Paare 1,2,3,5-Tetramethyl-4-methylen-endo- und -exo-6(trifluormethyl)bicyclo[3.1.0]hex-2-en (endo-1d und exo-1d) bzw. [6-D]-endo-1d und [6-D]-exo-1d wird beschrieben. Die Diastereomeren werden nach Singulett-Anregung übereinstimmend zu einem Gemisch von 1,2,3,5-Tetramethyl-6-methylen-endo- und -exo-4-(trifluormethyl)bicyclo-[3.1.0]hex-2-en (endo- 7 und exo-7) bzw. [4-D]-endo-7 und [4-D]-exo-7 isomerisiert. Ein Mechanismus für diesen - vom Verhalten der alkylsubstituierten Homofulvene stark abweichenden - Reaktionsverlauf wird vorgeschlagen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180711
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesen 2,4-Dinitro-substituierter Bis(phenyl)platin(II)-Verbindungen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1845-1856 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of 2,4-Dinitro-substituted Bis(phenyl)platinum(II) CompoundsSyntheses of the compounds {Pt(1,2,5,6-η4-COD)[2,4-(O2N)2C6H3](aryl)} [aryl = 4-CH3OC6H4; 4-CH3C6H4; 4-F3CC6H4; 4-O2NC6H4; 2,4-(O2N)2C6H3; COD = 1,5-cyclooctadiene] (7b-e, 4) and cis-{Pt[P(C6H5)3]2[2,4-(O2N)2C6H3](aryl)} [aryl = 4-F3CC6H4; 4-O2NC6H4, 2,4-(O2N)2C6H3] (cis-1d-f) are reported. Experiments to synthesize {Pt(1,2,5,6-η4-COD)[2,4-(O2N)2C6H3][4-(CH3)2NC6H4]} (7a) and cis-{Pt[P(C6H5)3]2[2,4-(O2N)2C6H3](XC6H4)} (X = 4-CH3O; 4-CH3) (cis-1b, c) with one electron acceptor-substituted and one electron donor-substituted phenyl ring resulted in the spontaneous reductive elimination of the biphenyls 2,4-(O2N)2C6H3-C6H4X-(4) [X = (CH3)2N; CH3O; CH3] (8a-c). This observation supports the hypothesis of a donor acceptor interaction in the transition state of the reductive biphenyl elimination from cis-1.
    Notes: Die Synthesen der Verbindungen {Pt(1,2,5,6-η4-COD)[2,4-(O2N)2C6H3](Aryl)} [Aryl = 4-CH3OC6H4; 4-CH3C6H4; 4-F3CC6H4; 4-O2NC6H4; 2,4-(O2N)2C6H3; COD = 1,5-Cyclooctadien] (7b-e, 4) und cis-{Pt[P(C6H5)3]2[2,4-(O2N)2C6H3](Aryl)} [Aryl = 4-F3CC6H4; 4-O2NC6H4, 2,4-(O2N)2C6H3] (cis-1d-f) werden beschrieben. Bei Versuchen zur Synthese von {Pt(1,2,5,6-η4-COD)[2,4-(O2N)2C6H3][4-(CH3)2NC6H4]} (7a) und cis-{Pt[P(C6H5)3]2[2,4-(O2N)2C6H3](XC6H4)} (X = 4-CH3O; 4-CH3) (cis-1b, c) mit jeweils einem Akzeptor- und einem Donator-substituierten Phenyl-Ring am Platin wurden spontan die Biphenyle 2,4-(O2N)2C6H3-C6H4X-(4) [X = (CH3)2N; CH3O; CH3] (8a-c) reduktiv eliminiert. Diese Beobachtung stützt die Hypothese über eine Donator-Akzeptor-Wechselwirkung im Übergangszustand der reduktiven Biphenyl-Eliminierung aus cis-1.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190607
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  • 6
    Electronic Resource
    Electronic Resource
    Über die reduktive Eliminierung des Biphenyl-Systems aus substituierten trans-Diphenylbis(triphenylphosphan)platin(II)-Verbindungen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3860-3874 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reductive Elimination of the Biphenyl System from Substituted trans-Diphenylbis(triphenyl-phosphane)platinum(II) Compoundstrans-Diarylbis(triphenylphosphane)platinum(II) (aryl = C6H5, 3—CH3C6H4, 4—CH3C6H4, 3—CH3OC6H4, 4—CH3OC6H4, 3—(H3C)2NC6H4) (trans-1a-f) have been synthesized. The trans-configuration in this type of compounds is demonstrated by an X-ray analysis of the parent compound trans-[Pt(PPh3)2(C6H5)2]. The thermolysis of trans-1a-f yields  -  despite the trans-position of the phenyl rings  -  stereospecific reductive elimination of the biphenyl system in a concerted reaction.
    Notes: Die Verbindungen trans-Diarylbis(triphenylphosphan)platin(II) (Aryl = C6H5, 3—CH3C6H4, 4—CH3C6H4, 3—CH3OC6H4, 4—CH3OC6H4, 3—(H3C)2NC6H4) (trans-1a-f) wurden synthetisiert. Die trans-Konfiguration dieses Verbindungstyps wurde zusätzlich durch eine Röntgenstruktur-analyse der Stammverbindung trans-[Pt(PPh3)2(C6H5)2] belegt. Bei der Thermolyse von trans- 1a-f wurde  -  trotz der trans-Stellung der Phenyl-Ringe  -  in einer konzertierten Reaktion stereospezifisch das Biphenyl-System eliminiert. Der Mechanisms dieser reduktiven Eliminierung wird diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151217
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  • 7
    Electronic Resource
    Electronic Resource
    Kernspin-Kopplungskonstanten mit Platin-195 als Kriterien für die Konfigurations-Bestimmung platin-organischer Verbindungen des zweiwertigen Platins (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1606-1619 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Spin-Spin Coupling Constants by Platinium-195 as Criteria for a Configuration Determination in Platinum Organic CompoundsThe platinum organic compounds [Pt(η4-1,5-cyclooctadiene)(XC6H4)2] and cis-[Pt(P(n-Bu)3)2-(XC6H4)2] (X = H, 4-CH3, 4-(CH3)3C, 4-(CH3)2N, 3-F, 4-F, 4-CH3O, 4-CF3; 3a - 4, cis-4a - h) as well as trans-[Pt(P(n-Bu)3)2(4-CH3OC6H4)2] (trans-4g) and trans-[Pt(P(n-Bu)3)2(4-CF3C6H4)2] (trans-4h) have been studied by 31P-, 13C-, and 1H NMR spectroscopy. The coupling constants 1J[195Pt, 31P], nJ[195Pt, 13C], nJ[195Pt, H], and 2J[31P, 13C] show a clear correlation to the ligand configuration at the dsp2-hybridized platinum and can therefore be used as basis for configuration determination.
    Notes: Die platin-organischen Verbindungen [Pt(η4-1,5-cyclooctadien)(XC6H4)2] und cis-[Pt(P(n-Bu)3)2-(XC6H4)] (X = H, 4-CH3, 4-(CH3)3C, 4-(CH3)2N, 3-F, 4-F, 4-CH3O, 4-CF3; 3a - h, cis-4a - h) sowie trans-[Pt(P(n-Bu)3)2(4-CH3OC6H4)2] (trans-4g) und trans-[Pt(P(n-Bu)3)2(4-CF3C6H4)2] (trans-4h) wurden 31P-, 13C- und 1-NMR-spektroskopisch untersucht. Die Kopplungskonstanten 1J[195Pt, 31P], nJ[195Pt, 13C], nJ[195Pt, H] und 2J[31P, 13C] zeigen eine eindeutige Abhängigkeit von der Konfiguration der Liganden am dsp2-hybridisierten Platin; sie können daher zur sicheren Konfigurations-Bestimmung verwendet werden.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170429
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesen und thermisches Verhalten von cis-Bis(4-tert-butyl-phenyl)platin(II)- und cis-(4-tert-Butylphenyl)(phenyl)platin(II)-Verbindungen mit Substituenten unterschiedlichen Charakters in den Phenylringen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 2011-2019 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Properties of cis-Bis(4-tert-butylphenyl)platinum(II)- and cis-(4-tert-Butylphenyl)-(phenyl)platinum(II) Compounds with Substituents of Different Electronic Character in the Phenyl Rings15 cis-bis(4-tert-butylphenyl)platinum(II) compounds and cis-(4-tert-Butylphenyl)(phenyl)platinum(II) compounds with substituents of increasing acceptor character have been synthesized and studied with respect to their thermal behaviour.
    Notes: 15 cis-Bis(4-tert-butylphenyl)platin(II)-Verbindungen und cis-(4-tert-Butylphenyl)(phenyl)platin(II)-Verbindungen mit Substituenten ansteigenden Akzeptor-Charakters wurden synthetisiert und massenspektrometrisch im Hinblick auf ihr thermisches Verhalten studiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180524
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese zweikerniger Platin-Verbindungen mit 1,4-Phenylen-Brücke (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 759-761 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of Dinuclear Platinum Compounds Containing a 1,4-Phenylene BridgeSyntheses of 1,4-phenylene bridged dinuclear platinum-organic compounds dichlorobis-(1,2,5,6-η4-1,5-cyclooctadiene)(μ-1,4-phenylene)diplatinum(II) (1), all-trans-dichloro(μ-1,4-phenylene)tetrakis(tributylphosphane)diplatinum(II) (3), and all-trans-diphenyl(μ-1,4-phenylene)tetrakis(tributylphosphane)diplatinum(II) (2) are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190235
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  • 10
    Electronic Resource
    Electronic Resource
    Über die Konfigurations- und Substituenten-Abhängigkeit der Pt — Cl-Valenzschwingungsfrequenzen und der 31P-NMR-Parameter in substituierten cis- und trans-Dichlorobis-(triphenylphosphan)platin(II)-Verbindungen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1694-1703 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Configurational and Substituent Dependence of the Pt—Cl Stretching Frequencies and of the 31P NMR Parameters in Substituted cis- and trans- Dichlorobis(triphenylphosphane)platinum(II) CompoundsCorrelations between substituent constants σ, Pt — Cl vibrational frequencies and 31P NMR parameters 1J[195Pt,31P] und δ[31P] for compounds of the type cis- and trans-{Pt-[P(aryl)(aryl′)(aryl″)]2 Cl2} (aryl, aryl′, aryl″ = substituted phenyl rings) are reported and discussed with respect to bonding properties.
    Notes: Zusammenhänge zwischen Substituenten-Konstanten σ, Pt—Cl-Valenzschwingungsfrequenzen und 31P-NMR-Parameter 1J[195Pt, 31P] und δ[31P] für die Verbindungen des Typs cis- und trans-{Pt[P(aryl)(aryl′)(aryl″)]2 Cl2} (aryl, aryl′, aryl″ = substituierte Phenyl-Ringe) werden beschrieben und im Hinblick auf die Bindungseigenschaften diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190521
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