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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 292 (2000), S. 320-322 
    ISSN: 1432-069X
    Keywords: Key words Porphyrins ; Propionibacterium acnes ; Chromatography ; Acne vulgaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 1395-1397 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 3057-3064 
    ISSN: 0887-6266
    Keywords: methyl-pendant PBZT ; crosslinking ; molecular modeling ; compressive strength ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Molecular mechanics and dynamics simulations have been performed on methyl-pendant PBZT to study the effects of intermolecular crosslinking. Several possible crosslinked structures were investigated. The effect of crosslinking was found to be strongly dependent upon crosslink type and, in some instances, crosslink density. A significant axial stress is predicted to occur upon the formation of phenyl-to-phenyl type crosslinks. This provides a reasonable explanation for the experimental observation of transverse cracks in the skin of crosslinked, MePBZT fiber. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 3057-3064, 1998
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Steroidal Compounds of Phosphorus, VII1). -Dimethylphosphinates and Dimethylthiophosphinates of HydroxysteroidsHydroxysteroids 1a-7a are converted in high yields into the dimethylphosphinates 1b-7b by dimethylphosphinic chloride or N,N-(dimethyl)dimethylphosphinic amide. Dimethylthiophosphinic chloride reacts uniformly and completely in presence of triethylamine to give the corresponding dimethylthiophosphinates 1c-7c, 8, and 9.
    Notes: Hydroxysteroide1a-7a werden durch Dimethylphosphinsäurechlorid oder N,N-(Dimethyl)-dimethylphosphinsäureamid mit hohen Ausbeuten in die Dimethylphosphinsäureester 1b-7b übergeführt. Dimethylthiophosphinsäurechlorid reagiert in Gegenwart von Triethylamin einheitlich und vollständig zu den entsprechenden Dimethylthiophosphinsäureestern 1c-7c, 8 und 9.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 842-848 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Quincyte DyeTo the Quincyte dye (QF) the bis(isopropylamphinaphthochinone) structure2 is assigned. As a quinone the dyestuff is able to add pyrrole derivatives.
    Notes: Dem roten Quincyte-Farbstoff (QF) wird die Bis(isopropylamphinaphthochinon)-Struktur2 zugeordnet. Als Chinon vermag der Farbstoff mit Pyrrolderivaten zu reagieren.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2-Metalated Diaziridinyl and 1,2,3,5-Tetrazinyl Radicals from 3-Chlorodiazirines with Bis(trimethylsilyl)- and Bis(trimethylgermyl)mercuryThe thermal or photochemical reaction of 3-substituted 3-chlorodiazirines 1 with (Me3M)2Hg (M = Si, Ge) leads to the formation of N1-metalated diaziridinyl radicals (ESR) 3 and 5. Analogously, 3-chloro-3-phenyldiazirine (1b) reacts under irradiation (λ ≧ 400 nm) giving N2-metalated 1,2,3,5-tetrazinyl radicals (ESR), most likely via the above mentioned diaziridinyl radicals. The tetrazinyl radicals are in equilibrium with the corresponding dimers and are thermo-labile. They decompose on attempted isolation.Hydroxysteroids 1a-7a are converted in high yields into the dimethylphosphinates 1b-7b by dimethylphosphinic chloride or N,N-(dimethyl)dimethylphosphinic amide. Dimethylthiophosphinic chloride reacts uniformly and completely in presence of triethylamine to give the corresponding dimethylthiophosphinates 1c-7c, 8, and 9.
    Notes: Aus den 3-substituierten 3-Chlordiazirinen 1 und (Me3M)2Hg (M = Si, Ge) entstehen teils thermisch, teils photochemisch die N-metallierten Diaziridinylradikale (ESR) 3 und 5. Analog reagiert 3-Chlor-3-phenyldiazirin (1b) unter Bestrahlung (λ ≧ 400 nm), wahrscheinlich über die genannten Radikale, zu N2-metallierten 1,2,3,5-Tetrazinylradikalen (ESR). Diese stehen im Gleichgewicht mit ihren Dimeren und sind thermolabil. Versuche der Isolierung führten zur Zersetzung.Hydroxysteroide1a-7a werden durch Dimethylphosphinsäurechlorid oder N,N-(Dimethyl)-dimethylphosphinsäureamid mit hohen Ausbeuten in die Dimethylphosphinsäureester 1b-7b übergeführt. Dimethylthiophosphinsäurechlorid reagiert in Gegenwart von Triethylamin einheitlich und vollständig zu den entsprechenden Dimethylthiophosphinsäureestern 1c-7c, 8 und 9.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 699 (1966), S. 153-167 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kondensation von Pyrrolderivaten mit Quadratsäure (QS) führt zu Tetracyclotrimethin-Farbstoffen (1-5), die als neuartige Brücke zwischen Pyrrol- und Pyrrolenkern ein Cyclobutendionat-Anion besitzen. Außer den Farbstoffen können auch farblose Tripyrrylcyclo-butenderivate und gelbe 1.2-Dipyrryl-cyclobutendione-(3.4) vom Typ 17 erhalten werden. Auch Indole und mehrwertige Phenole konnten mit QS zu den Verbindungen 11-13 bzw. 14-15 umgesetzt werden. Aus QS wird das sehr reaktionsfähige 1.2-Diacetoxy-cyclobutendion-(3.4) (16) dargestellt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 740 (1970), S. 196-199 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensation of Pyrroles with Phthalic Anhydrideα.α;′-Dialkylpyrroles react with phthalic anhydride to give o-carboxybenzoyl-pyrroles 5a or c and benz[f]isoindoldiones 4a or b.
    Notes: Die Kondensation von β.β′-unsubstituierten α.α′-Dialkyl-pyrrolen mit Phthalsäureanhydrid gibt über die 2-Carboxy-benzoyl-pyrrole 5a bzw. c die Benz[f]isoindoldione 4a bzw. b.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 741 (1970), S. 101-108 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclobutene Derivatives in the Pyrrole Series, III. Pyrrole Derivatives of Squaric AcidReaction of diethyl squarate with Grignard compounds gives the substituted cyclobutene3.4-diones 1-3. The pyrrolyl-ethoxy-cyclobutenediones 6 react with ammonia to the pyrrolyl-amino-cyclobutenediones 7, which are converted with pyrroles in a strongly acidic medium into the dipyrrolyl-amino-cyclobutenone dyes 8. The direct synthesis of β,β-dipyrrolyl squaric acid dyes 10 is achieved by an azeotropic condensation process.
    Notes: Die Reaktion von Quadratsäure-diäthylester mit Grignard-Verbindungen ergibt die substituierten Cyclobutendione-(3.4) 1-3. Aus den Pyrrolyl-äthoxy-cyclobutendionen 6 werden mit Ammoniak die Pyrrolyl-amino-cyclobutendione 7 erhalten, die mit Pyrrolen in stark saurem Medium zu den neuartigen Dipyrrolyl-amino-cyclobutenon-Farbstoffen 8 kondensieren. Die Direktsynthese der β,β-Dipyrrolyl-quadratsäure-Farbstoffe 10 ist erstmals gelungen.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 712 (1968), S. 123-137 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monopyrrolylhydroxy-cyclobutendione-(3.4) (2) und ihre Ester können durch Umsetzung von Pyrrolen mit Quadratsäurediäthylester erhalten werden. Daraus ergibt sich eine Bestätigung des Bildungsmechanismus der symmetrischen und eine Methode zur Synthese unsymmetrischer Quadratsäure-Farbstoffe.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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