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  • Electronic Resource  (98)
  • Chemistry  (95)
  • General Chemistry  (9)
  • Patella  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Paget's disease of the patella (1990)
    Springer
    Skeletal radiology 19 (1990), S. 407-410 
    Details
    ISSN: 1432-2161
    Keywords: Paget's disease ; Patella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Five patients with Paget's disease involving the patella were evaluated for the following radiographic features: trabecular pattern, cortical integrity, density, and size of the affected patella. Radiographic appearances consisted of minimal trabecular coarsening in the patella of nearly normal size and progressed to considerable cortical thickening and osteoblastic remodeling in a dramatically enlarged patella. The radiologic features of Paget's disease of the patella are distinctive and should obviate biopsy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241790
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  • 2
    Electronic Resource
    Electronic Resource
    Primary tumors of the patella (1989)
    Springer
    Skeletal radiology 18 (1989), S. 365-371 
    Details
    ISSN: 1432-2161
    Keywords: Bone tumors ; Patella ; Patellar tumors ; Skeletal neoplasms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study reports 42 cases of histologically proven and radiographically correlated primary patellar tumors. Despite diverse histologic diagnoses, the radiographic appearances of benign as opposed to malignant patellar neoplasms are essentially indistinguishable. Although the literature suggests that giant cell tumor is the most frequent benign tumor of the patella, the most common benign neoplasm in this series is chondroblastoma (16 cases). Only four primary malignant lesions were encountered, three cases of lymphoma and one case of hemangioendothelioma. Since 38 (90%) of the 42 cases were benign, a benign etiology should be strongly favored, notwithstanding the radiographic appearance, whenever a primary patellar tumor is encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361426
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  • 3
    Electronic Resource
    Electronic Resource
    Chondroblastoma of the patella (1988)
    Springer
    Skeletal radiology 17 (1988), S. 413-419 
    Details
    ISSN: 1432-2161
    Keywords: Chondroblastoma ; Bone tumor ; Chondroblastoma of patella ; Patella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study reviews 16 cases of chondroblastoma of the patella which constitute nearly 6% of a large group of chondroblastomas scattered throughout the skeleton. Both radiologic and histologic appearances of chondroblastomas of the patella are indistinguishable from those of chondroblastomas arising in other sites. A reasonable differential diagnosis, including chondromalacia patella, is discussed together with important therapeutic considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361660
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  • 4
    Electronic Resource
    Electronic Resource
    π-Orbital Interactions in Möbius-Type Molecules as Studied by Photoelectron Spectroscopy (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1743-1751 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some benzobarrelenes were studied by photoelectron (PE.) spectroscopy. The results can be interpreted by considering dominant through-space interaction of the π-molecular fragments in a Möbius-fashion, Some chemical features of the substrates are rationalized on the basis of these findings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650609
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  • 5
    Electronic Resource
    Electronic Resource
    Heterocyclen mit einem Azaallyl-System, 4. 5H-Dibenz[c,e]azepine mit Donor-Gruppen in 7-Stellung (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2085-2090 
    Details
    ISSN: 0009-2940
    Keywords: 5H-Dibenz[c,e]azepines ; Imidates ; alkyl ; heterocyclic ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocycles with an Azaallyl System, 4.  -  5H-Dibenz[c,e]azepines with Donor Groups at the 7-Position5H-Dibenz[c,e]azepines substituted with a methoxy (1) or methylthio group (10) at the 7-position have been synthesized from 6,7-dihydro-5H-dibenz[c,e]azepin-5-one (5) by regioselective O- or S-alkylation with methyl trifluoromethansulfonate and subsequent NH-deprotonation. According to the spectroscopic properties the semicyclic 7-membered alkyl imidates exist exclusively in the benzenoid 5H structure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240934
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  • 6
    Electronic Resource
    Electronic Resource
    De l'action de quelques chlorures dérivés de l'acide carbonique sur la diméthylaniline (1925)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 8 (1925), S. 490-500 
    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.19250080174
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanisms of Diazo Coupling Reactions. Part XXXII. The Diazoamino Rearrangement in 20% Acetonitrile/Aqueous BuffersPart XXXI: [1]. (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 122-132 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rearrangements of 4′-methoxy-N-methyl- and N-methyl-4′-nitro-diatzoaminobenzene have been studied in 20% acetonitrile/aqueous buffers. The reactions are specifically acid catalyzed and involve pre-equilibrium formation of amine and diazonium salt followed by rate-limiting attack of the diazonium ion at a C-atom (C-coupling) to give the corresponding aminoazo compounds. There is no evidence to suggest that, under the present conditions, mechanisms other than the established Friswell-Green mechanism occur. The traditional two-stage synthesis of aminoazo compounds via isolated diazoamino compounds can therefore be replaced by a one stage process for amines which undergo initial attack at a N-atom by diazonium ion (N-coupling).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650112
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  • 8
    Electronic Resource
    Electronic Resource
    Transport Properties of H+-Selective Membranes Containing Amine-Derivative Ionophores and Mobile Sites (1993)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 76 (1993), S. 407-415 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transport processes in plasticized PVC membranes containing the H+ chromoionophore ETH 5294 and additional tetraphenylborate-type mobile sites were analyzed by employing the potential-step method. Using chronoamperometry, impedance spectroscopy, and UV/VIS absorbance measurements, it is shown that the ionophore behaves as a carrier for protons, when the membranes are immersed between two aqueous solutions. It was possible to document the changes in the concentration profiles of both free ionophores and ionic species in some of the membranes. There is no evidence of proton hopping between the ionophores.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19930760124
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Chemie von Isoindolen und Isoindoleninen, XXVII. 2-Alkyl-2H-dibenz[e,g]isoindole: Synthese, Eigenschaften, Reaktionen (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 81-87 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Chemistry of Isoindoles and Isoindolenines, XXVII. - 2-Alkyl-2H-dibenz[e,g]isoindoles; Synthesis, Properties, ReactionsThe tetracyclic hetarenes 6 are easily accessible via the N-oxide route starting with 9,10-bis(bromomethyl)phenanthrene (3) in a three-step procedure. The twofold annelation reduces the diene reactivity of the central 2H-isoindole system. Cycloaddition occurs as well with activated alkynes as with arynes. The hetarenes 6 can be protonated with trifluoroacetic acid and substituted by reaction with arenediazonium tetrafluoroborates.
    Notes: Die tetracyclischen Hetarene 6 sind nach dem N-Oxid-Verfahren einfach aus 9,10-Bis(brommethyl)phenanthren (3) präparativ dreistufig zugänglich. Durch die zweifache Anellierung wird die Reaktivität des zentralen 2H-Isoindol-Systems abgeschwächt. Cycloaddition tritt sowohl mit aktivierten Alkinen als auch mit Arinen ein. Die Hetarene 6 sind mit Trifluoressigsäure protonierbar und durch SE-Reaktion mit Arendiazonium-tetrafluoroboraten substituierbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210113
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Chemie von Isoindolen und Isoindoleninen, XXVIII. 3-Alkoxy-1H-isoindole  -  Synthesen und Eigenschaften (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 243-252 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Chemistry of Isoindoles and Isoindolenines, XXVIII.  -  3-Alkoxy-1H-isoindoles, Syntheses and Properties3-Alkoxy-1H-isoindoles 1 bearing substituents at the carbocyclic moiety have been synthesized from substituted 2,3-dihydro-1H-isoindol-1-ones 4 by regiospecific O-alkylation to 5 with trialkyloxonium tetrafluoroborates or methyl trifluoromethanesulfonate and subsequent NH deprotonation. According to the spectroscopic properties the semicyclic alkyl imidates 1 exist exclusively in the benzenoid 1H structure; the tautomeric o-quinonoid 2H structure 2 cannot be detected by spectroscopic means.
    Notes: 3-Alkoxy-1H-isoindole 1 mit Substituenten am carbocyclischen Teil wurden aus substituierten 2,3-Dihydro-1H-isoindol-1-onen 4 durch regiospezifische O-Alkylierung mit Trialkyloxonium-tetrafluoroboraten oder Trifluormethansulfonsäure-methylester zu 5 und nachfolgende NH-Deprotonierung synthetisiert. Aufgrund der spektroskopischen Befunde existieren die semicyclischen Imidsäure-alkylester 1 ausschließlich in der benzoiden 1H-Form; die tautomere 2H-Form 2 mit o-chinoider Struktur ist spektroskopisch nicht nachweisbar.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210209
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