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  • 11
    Electronic Resource
    Electronic Resource
    Dithiocarbonsäuren, Dithiocarbonsäureester oder Thiocarbonsäureamide aus methylenaktiven Chlormethylverbindungen und Schwefel (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 243-262 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dithiocarboxylic Acids, Dithiocarboxylic Esters, or Thiocarboxylic Amides by Reaction of Methylene-active Chloromethyl Compounds with SulfurWith a mixture of sulfur and amine in DMF at room temperature halomethyl compounds (1, 5-10) can be oxidized to give thiocarboxylic acids (2, 11-16) and their derivatives (3, 4, 17-35). We studied this reaction in detail especially with chloroacetic derivatives (11-15) or chloromethyl heterocycles (16) formally derived from chloroacetic acid.The resulting thiooxalic acid derivatives (11-27) represent activated acids and very useful C2-synthons, especially for the synthesis of heterocycles.Oxidation in the presence of triethyl amine leads to dithiocarboxylates (11-16) which can be alkylated to dithioesters (17-27) in high yields.As a rule, with different primary and secondary amines instead of tertiary amines these dithiocarboxylates or dithiocarboxylic esters can be transformed already at low temperatures to thioamides (28-35).
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310211
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  • 12
    Electronic Resource
    Electronic Resource
    1,3,4-Thiadiazole durch Umsetzung von Dithioestern mit KohlensäurehydrazidenHerrn Professor Schulz zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 55-64 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3,4-Thiadiazoles by Reaction of Dithiocarboxylic Esters with Carbonic Hydrazides1,1-Dithiooxalic esters 1 and heteroaryl dithiocarboxylic esters 2 react with carbonic hydrazides yielding 1,3,4-thiadiazoles. The 1-thiooxamoyl semicarbazides 3 or 1-heteroylthiocarbonyl semicarbazides 4, primarily formed by thioacylation of semicarbazide, where isolated. By cyclocondensation they yield 1,3,4-thiadiazole-2(3 H) ones 5, 6, or in the presence of acetic anhydride 3-acetyl-1,3,4-thiadiazol-2-ones- 7, 8, respectively.2-Amino- or 2-methylthio-1,3,4-thiadiazoles 11, 12 or 13, 14 are formed by reaction of the dithioesters 1, 2 with thiosemicarbazide or methyl dithiocarbazinate. By this way 1,3,4-thiadiazoles with heteroaryl- or carbamoylresidues in position 5 where synthesized for the first time.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320107
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  • 13
    Electronic Resource
    Electronic Resource
    Hauptmann, S., Graefe, J.; Remane, H.: Lehrbuch der organischen Chemie. 2. Aufl. 797S., 122 Abb., 58 Tab., 16,7×24 cm. Leipzig: VEB Deutscher Verlag für Grundstoffindustrie 1980. Kunstleder, 52,50 M (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 174-174 
    Details
    ISSN: 0021-8383
    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/prac.19833250125
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  • 14
    Electronic Resource
    Electronic Resource
    Synthese und spektrale Charakterisierung von blauen Benzenazofarbstoffen (1986)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 497-514 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Spectral Characterization of Blue Azo Dyes of the Benzene Series53 Donor-acceptor substituted azo dyes of the benzene series were prepared by diazonium-coupling reactions (1 a-s) or halogen-cyanide exchange (→2 a-x, 3 a-j). Described are the preparation of the amines 4 a-m and the coupling compounds 5 a-t and the procedure of diazotizing and coupling.The colouristic and spectroscopic data show that compounds of the general formula 1 are excellent brilliant blue azo dyes useful for dyeing polyester material.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19863280406
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  • 15
    Electronic Resource
    Electronic Resource
    Versuche zur Synthese sterisch gehinderter Thiazylarene und deren Beziehung zu Arylsulfenylnitrenen (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 81-86 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attempts to Synthesize Sterically Hindered Thiazyl Arenes and Their Relationship to Arylsulfenyl NitrenesUp till now all attempts to synthesize organic thiazyl compounds in substance failed. Stabilization leads to the corresponding disulfide 2, the thioaminyl radical 7 and the sulphur diimide 8. Formally thiazyl compounds 1 and sulfenyl nitrenes 1 were resonance structures. Via sulfenyl nitrenes 1 the formation of 2, 7, 8 can be discussed. An in situ preparation of sulfenyl nitrene 1a via the sulfenyl chloride 5a, synthesized by chlorination of the disulfide 2a, and the sulfenyl azide 6a is described in detail. 1a can also be prepared from the sulfenyl amide 4a by oxidation. The structures of the radicals 7a-f and 12f are discussed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290111
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  • 16
    Electronic Resource
    Electronic Resource
    CLAISEN-Kondensation mit ausgewählten Dithioestern - Synthese spezieller 3-Methylthio-acrylnitrile (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 35-40 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: CLAISEN-Condensations with Selected Dithioesters - Synthesis of Special 3-Methylthio-acrylnitriles.A useful synthetic route to the mono- and diheteroaryl-3-methylthio-acrylnitriles 1 and 2 is demonstrated by the thioanalogous CLAISEN-condensation.In the presence of sodium hydride in tetrahydrofurane or under PTC-conditions heteroaryl dithiocarboxylic esters 3 react with CH-acidic compounds 4 or 9 to form 3-mercapto-acrylnitriles (e. g. 5). Methylation leads to mono- and diheteroaryl-3-methylthioacrylnitriles 1 and 10 (type 2). In the same manner tetrathioterephthalic ester 6 reacts with two equivalents of CH-acidic compounds yielding 8 and 11. By means of spectroscopic methods, especially 1H- and 13C-n.m.r., the structures of the compounds obtained are confirmed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330105
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  • 17
    Electronic Resource
    Electronic Resource
    Hauptmann, S., Mann, G., Hantschmann, A.: Aufgaben zur organischen Chemie. 277 S., 13 Abb., 14 × 22 cm. Leipzig: VEB Deutscher Verlag für Grundstoffindustrie 1981. Gebunden 18,- M (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 1070-1071 
    Details
    ISSN: 0021-8383
    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/prac.19823240633
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  • 18
    Electronic Resource
    Electronic Resource
    Thiohydrazide und 1,3,4-Thiadiazole durch Hydrazinolyse von Dithioestern (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 649-658 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thiohydrazides and 1,3,4-Thiadiazoles by Hydrazinolysis of Dithiocarboxylic EstersThe reaction of 1,1-dithiooxalicesters 1 and heteroaryldithiocarboxylicesters 2 with excess hydrazine yields stable thiohydrazides 3 and 4, respectively. If the hydrazinolysis is carried out with only 0,5 equivalent hydrazine 1,3,4-thiadiazoles 6 and 7, equally substituted in position 2 and 5, result. 1,3,4-Thiadiazoes are also formed by heating the isolated thiohydrazides 3 and 4. The thiohydrazides 3 and 4 are also excellent starting compounds for the synthesis of unsymmetrically substituted 1,3,4-thiadiazoles (8, 9), especially for derivatives with carbamoyl or heteroaryl residues.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310415
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  • 19
    Electronic Resource
    Electronic Resource
    Fracture of porous polyethylene-bone composite (1983)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 17 (1983), S. 59-70 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Porous high-density polyethylene specimens were implanted in the femurs of mongrel canines. At the end of the residency period (3 or 6 months), the animals were sacrificed and the implants were retrieved. The work-of-fracture of the implant specimens was then determined using the technique of Tattersall and Tappin. The work required to fracture a specimen in three-point bending by controlled crack propagation through a triangular cross section was obtained directly from the load-deflection curve. The area of the resulting fracture surface was measured by macro-photographic techniques, and the work-of-fracture was calculated as work per unit area. The implants were subsequently sectioned and examined microradiographically to determine the extent of bone ingrowth. Bone specimens adjacent to the implants and porous high-density polyethylene controls (no ingrowth) were also tested to determine their work-of-fracture. The results showed that bone adjacent to the implant specimens had a higher work-of-fracture than normal medial, canine femoral bone and was not appreciably different from the composite. The work-of-fracture of porous high-density polyethylene was not significantly increased by an increase in bone infiltration, and this anomalous behavior was attributed to a degradation of the polyethylene during implant residence. Control studies supported this hypothesis.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820170106
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  • 20
    Electronic Resource
    Electronic Resource
    Synthese von nitro- und aminosubstituierten Thiobenzamiden durch Thiolierungsreaktionen mit elementarem Schwefel unter milden Bedingungen (1978)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 313-323 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Nitro- and Amino-Substituted Thiobenzamides by Thiolation Reactions with Elemental Sulfur at Mild ConditionsThe Synthesis of thiobenzamides 2-7 by basecatalyzed thiolation of nitro-benzyl-halides (type 1), especially at low temperatures, and the selective synthesis of p- and m-nitro-thio-benzamides (2, 3) or p-and m-amino-thiobenzamides (5, 6), respectively, are described. o-Nitro-benzylhalides (→ 4, 7) are less reactive than p- and m-nitro-benzylhalides.The reaction of nitrobenzylhalides (type 1) with elemental sulfur and amines occuring at low temperatures to give 2-4 leads via structures of the type 11, 15 and 16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19783200220
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