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  • 1
    Electronic Resource
    Electronic Resource
    Coronanden mit 1,2-Dithio-ethen-Einheiten. II. Kristallstrukturen der beiden Thiakronenether 8,9-Dicyan-8,9-didehydro-7,10-dithia[12]krone-4 und 11,12-Dicyan-11,12-didehydro-10,13-dithia[15]krone-5 (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 155-160 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Coronands with 1,2-Dithio-ethene Units. II. Crystal Structures of the Two Crown Thioethers 8,9-Dicyano-8,9-didehydro-7,10-dithia-[12]crown-4 and 11,12-Dicyano-11,12-didehydro-10,13-dithia[15]crown-5The structures of the title compounds have been determined by X-ray analysis. Both thioethers crystallize in the monoclinic system with the following crystal data. Dithia-[12]crown-4: a = 751.7(1), b = 1010.4(1), c = 1639.8(2) pm, β = 95.08(1)°, Z = 4, space group P21/n; dithia[12]crown-5: a = 1169.9(3), b = 916.7(3), c = 1414.1(4)pm, β = 92.51(2)°, Z = 4, space group P21/c. The structures were refined to final R = 0.048 (Rw = 0.031) and 0.040 (0.046), respectively. They are characterized by their structural parameters (bond lengths and angles, torsion angles, l.s. planes) and discussed in special consideration of the ring conformation and the geometric arrangement of the donor atoms.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340211
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  • 2
    Electronic Resource
    Electronic Resource
    4-(1-Methyl-2-sulfamoylvinyl)pyrazoles by Ring Transformation of 1,1-dioxo-2H-1,2-thiazine-4-carbaldehydes with hydrazinesDedicated to Professor H. G. O. Becker on the Occasion of his 75th Birthday (1997)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 277-283 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As masked 1,3-dicarbonyl compounds, 1,1-dioxo-2H-1,2-thiazine-4-carbaldehydes (2a-e, 7) undergo ring transformations with nucleophilic hydrazines to produce 4-[1-methyl-2-(arylsulfamoyl)vinyl]pyrazoles (9a-i). For 9h, an X-ray structural analysis is reported. With less nucleophilic semicarbazide and p-nitrophenylhydrazine the hydrazones (11a, b) were isolated. The carbaldehydes 2a-e, 7 and 8a, b were synthesized by formylation of the 1,1-dioxo-2H-1,2-thiazines 1a-e, 5 and 6a, b with dichloromethyl methyl ether/TiCl4. In the case of 1a-e mixtures of 4- and 6-carbaldehydes (2a-e/3a-e) were obtained, which, however, could be used for the synthesis of pyrazoles.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19973390149
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  • 3
    Electronic Resource
    Electronic Resource
    Amidine-Induced Ring Transformation of a Substituted 1,1-Dioxo-1,2-thiazine-4-carbaldehyde into New Pyrimidine Derivatives (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 2617-2620 
    Details
    ISSN: 0947-3440
    Keywords: Ring transformation ; Nitrogen heterocycles ; Cyclizations ; Substituted 5-[2-(N-phenylsulfamoyl)vinyl]-pyrimidines ; Masked 1,3-dicarbonyl compounds ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As a masked 1,3-dicarbonyl compound, the 1,1-dioxo-2H-1,2-thiazine-4-carbaldehyde 1 undergoes ring transformation with amidines to produce 2-substituted 4-methyl-5-[1-methyl-2-methylthio-2-(N-phenylsulfamoyl)vinyl]pyrimidines 3a-f. For 3b, an X-ray structure analysis is reported. From the 4-methyl-2-methylthio-5-[1-methyl-2-methylthio-2-(N-phenylsulfamoyl)vinyl]pyrimidine (3e), the substituted pyrimidinone 4 is obtained by acidic hydrolysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719971230
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  • 4
    Electronic Resource
    Electronic Resource
    Crosslinking of vinylsilicone resins initiated by dicumyl peroxidePresented before the Division of Polymer Chemistry at the 138th Meeting of the American Chemical Society, New York, September, 1960. (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. 474-479 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effects of cure time, temperature, and initiator concentration on the mechanical properties of a vinylsilicone resin cured with dicumyl peroxide were investigated. The resin had a second-order transition extending from below 25 to about 100°C. The transition region broadened as the degree of crosslinking increased. Measurements of physical properties at room temperature were very sensitive to small temperature changes. Ultimate strength measurements were particularly unreliable indicators of degree of cross linking because of large random variations and because they depended upon other structural factors besides crosslink density. The best test of degree of crosslinking was modulus measurements above the transition temperature of the resin. Such measurements have a sound theoretical basis and the practical advantage of being insensitive to small temperature changes. Modulus measurements have the additional advantages of being a nondestructive test with a high degree of inherent precision compared to other physical tests. A concentration of about 1.5 wt.-% dicumylperoxide was optimum for crosslinking the vinylsilicone resin studied. Maximum crosslinking was obtained when the peroxide was utilized slowly a t low temperatures for long cure periods. When a 4-hr. cure was used the optimum temperature range was 125 to 135°C.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1962.070062213
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  • 5
    Electronic Resource
    Electronic Resource
    Werkstoff-Datenbank (1993)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 410-415 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Material databaseThis paper describes a new materials database named SWDB. SWDB is the German abbreviation for „Sollwert-Werkstoff-Datenbank“ and should be read as „Specified-Materials-Database“. SWDB is a state of the art user friendly materials database which provides adequate information on standardized and not standardized materials characteristics of solid materials from ferrous and non-ferrous metals and other metallic alloys currently used in engineering practice. Apart from the chemical composition and mechanical-technological properties of metallic materials based on various standards and specifications, the database includes reference to a large number of possible alternative materials in a concise and pregnant form which is transparent and easily accessible for application engineers. The material data are composed on the basis of an absolutely new structured model and are shown as a function of the specified material, product shape, dimension, delivery condition and sampling.SWDB includes additional information on physical properties as well as exhaustive information on heat treatment, hot and cold forming, weldability and hints for application. The SWDB has a dual character: on the one hand it can be operated as an individual and independent database, on the other hand as a satellite database to support the corrosion database within the information system on corrosion and protection, „CORIS“.
    Notes: Die neu entwickelte Sollwert-Werkstoff-Datenbank (SWDB) ist eine benutzerfreundliche Werkstoff-Datenbank, die Informationen über genormte und nicht genormte Werkstoff-Kennwerte massiver, metallischer Werkstoffe bereitstellt. Der Inhalt dieser Datenbank setzt sich zusammen aus Solldaten von ingenieurmäßig gebräuchlichen, massiven Werkstoffen aus Eisen- und Nichteisenmetallen. Neben der chemischen Zusammensetzung und den mechanisch-technologischen Eigenschaften von metallischen Werkstoffen nach verschiedenen Normen und Spezifikationen sind eine Vielzahl möglicher alternativer Werkstoffkandidaten in kurzer, prägnanter und für den Anwender gut einsehbarer Form referiert. Die Daten sind auf der Basis eines völlig neu strukturierten Modells aufgebaut und in Abhängigkeit vom spezifizierten Werkstoff von der Erzeugnisform, der Abmessung, dem Lieferzustand und von der Probennahme wiedergegeben.Außerdem enthält die SWDB zusätzliche Informationen über physikalische Kennwerte sowie zahlreiche Angaben zur Wärmebehandlung, Warm- und Kaltformgebung, Schweißbarkeit und Anwendungshinweise. Die SWDB hat eine doppelte Funktion: einerseits arbeitet sie als unabhängige Datenbank eigenständig, andererseits als Satellit-Datenbank, die die Korrosionsfakten-Datenbank im Informationssystem für Korrosion und Korrosionsschutz „CORIS“ unterstützt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19930441005
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  • 6
    Electronic Resource
    Electronic Resource
    Photoreactions of phenyl-substituted N-(pent-4-enyl-1-oxy)pyridine-2(1 H)-thiones (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 1014-1023 
    Details
    ISSN: 0947-6539
    Keywords: alkoxy radicals ; cyclizations ; pyridinethiones ; radicals ; tetrahydrofurans ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of hitherto unknown N-(pent-4-enyl-1-oxy)pyridine-2(1 H)-thiones (6) were prepared from substituted pent-4-enyl tosylates or benzylic chlorides. On irradiation with incandescent light heterocycles 6 liberated alkoxy radicals 2, which were studied for rearrangement reactions. Surprisingly, all transformations involving the 1-phenylpent-4-enyl-1-oxy radical (2a), for example, to give the substituted thioether 8, 2-bro-momethyl-5-phenyltetrahydrofuran (11), or the tetrahydrofuran 14a, were not stereoselective. On the other hand 2-, 3- mono-, and 1,5-disubstituted pent-4-enyl-1-oxy radicals 2d-e and 2g cyclized in good yields and with good to excellent stereoselectivities to give the corresponding 2,4-cis- and 2,3-trans-phenyltetra-hydrofurfuryl radicals 3d-e, and the trans-2-benzyl-5-methyl substituted intermediate 3g. The major reaction mode of the 4-phenylpent-4-enyl-1-oxy radical (2f) was the 6-endo cyclization, which afforded 3-phenyltetrahydropyran (13f) as the major product (endo:exo = 93:7) after trapping with hydrogen donors. According to the experimental data of the present study, the unusual reactivity of the 1-phenylpent-4-enyl-1-oxy radical (2a) in 5-exo-trig ring closures could be caused by a coplanar arrangement of the benzyloxy moiety in the transition state of the cyclization. This interaction would lock the radical center in 2a in a preferred conformation, which would result in similar steric effects for both cis- and trans- cyclizations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.1460020816
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  • 7
    Electronic Resource
    Electronic Resource
    Reaktionen mit Phosphinalkylenen, XXVIII. Neue Synthesemöglichkeiten für α-verzweigte β-Keto-carbonsäureester (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2794-2801 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Alkylidenetriphenylphosphoranes, XXVIII. New Syntheses of α-Branched β-Ketocarboxylic AcidsThe reaction between acyl chlorides 1 and (1-alkoxycarbonylalkylidene)triphenylphosphoranes 2 in a molar ratio of 1:1 gives rise to the formation of phosphonium chlorides 3. The electrolysis of these phosphonium salts leads to the formation of triphenylphosphine and α-branched β-ketocarboxylic acid esters 6. The reaction between 1 and 2 in a molar ratio of 1:2 produces allenic carboxylic acid esters 8, which react with piperidine (9) to form enamines 10. Acidic hydrolysis of the latter compounds also yields the β-ketoesters 6.
    Notes: Säurechloride 1 und [1-Alkoxycarbonyl-alkyliden]-triphenylphosphorane 2 reagieren im Molverhältnis 1:1 zu Phosphoniumsalzen 3, deren Elektrolyse neben Triphenylphosphin α-verzweigte β-Keto-carbonsäureester 6 ergibt. Setzt man die aus 1 und 2 im Molverhältnis 1:2 entstehenden 8 mit Piperidin (9) um, so erhält man Enamine 10, bei deren saurer Hydrolyse ebenfalls die Verbindungen 6 entstehen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030912
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  • 8
    Electronic Resource
    Electronic Resource
    Reaktionen mit Phosphinalkylenen, XXXVI. Reaktionen von Phosphinalkylenen mit Schwefelkohlenstoff - Synthese von Ketenmercaptalen und Dithiocarbonsäureestern (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 28-41 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Alkylidenetriphenylphosphoranes, XXXVI. Reaction of Alkylidenetriphenylphosphoranes with Carbon Disulfide  -  Synthesis of Ketene Mercaptals and DithiocarboxylatesAlkylidenetriphenylphosphoranes 1 react with CS2 in the molar ratio 2:1 to yield phosphonium salts 5, which in the reaction with halo compounds give rise to the formation of 2-(triphenylphosphoranylidene)alkanedithioates 8 and phosphonium salts 7. The compounds 8 do not undergo Wittig reactions but react with halo compounds 6 or 9 to give phosphonium halides 10. Alkaline hydrolysis of 10 leads to ketene mercaptals 16 and triphenylphosphine oxide.  - Phosphonium ylides 18 (R1 and R2 ≠ H) react with CS2 to yield betaines 19 which react with halo compounds to form phosphonium salts 20. In the electrolysis of 20 triphenylphosphine and dithiocarboxylates are formed.
    Notes: Alkylidentriphenylphosphorane 1 reagieren mit CS2 im Molverhältnis 2:1 zu Phosphoniumsalzen 5, die sich mit Halogenverbindungen 6 zu 2-(Triphenylphosphoranyliden)alkandithiosäureester 8 und Phsophonium-halogeniden 7 umsetzen. Die Verbindungen 8 gehen keine Wittig-Reaktion ein, reagieren jedoch mit Halogeniden 6 bzw. 9 zu Phosphoniumsalzen 10, deren alkalische Hydrolyse Ketenmercaptale 16 und Triphenylphosphinoxid liefert. Phosphor-Ylide 18 (R1 und R2 ≠ H) setzen sich mit CS2 zu Betainen 19 um, die mit Halogenverbindungen 9 zu Phosphoniumsalzen 20 reagieren, bei deren Elektrolyse Triphenylphosphin und Dithiocarbonsäureester 21 gebildet werden.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120104
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and Reactions of Pyridinethiones (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 1003-1007 
    Details
    ISSN: 0170-2041
    Keywords: Pyridinethiones ; Pyridinecarbonitriles ; Thieno[2,3-b]pyridines ; Nitriles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The push-pull systems 1 and 7 undergo regioselective cyclization with cyanothioacetamide 2 leading to pyridinethiones 3 and 8. Subsequent S-alkylation affords the alkylthio derivatives 5 and 10. Thieno[2,3-b]pyridines 6 and 11 are formed by using an α-CH-acidic halogen compound as alkylating agent, followed by Thorpe-Ziegler reaction. The cyano group in 6d and 11d can be converted into an imidazoline ring by treatment with 1,2-diaminoethane hydrate and carbon disulfide. Structures are supported by spectral data as well as by X-ray analysis of 5d.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301159
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  • 10
    Electronic Resource
    Electronic Resource
    Novel concepts in directed biaryl synthesis, XXXVII. Synthesis and enantiomerization of a nonracemic 2-hydroxy-2′-biarylcarbaldehyde, a probable intermediate in the atropo-enantioselective ring opening of biaryl lactones (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 313-316 
    Details
    ISSN: 0170-2041
    Keywords: Biaryls, configuratively labile ; Enantiomerization ; Biaryls, lactol-bridged ; Biaryls, stereoselective construction of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The directed preparation of a “free”, i.e. nonprotected biaryl with a phenolic OH function and a formyl group in opposite ortho positions, in a nonracemic form, is described. The free activation barrier ΔG≠ for the atropisomerization, which was determined to be 99.2 kJ mol-1, is far lower than expected for an exclusively physical rotation process and is more likely in agreement with an isomerization via lactol-type cyclic intermediates previously postulated.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940314
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