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  • 1985-1989  (6)
  • 1960-1964  (1)
  • Organic Chemistry  (4)
  • Polymer and Materials Science  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Strained Ketenes from α-Bromoacyl Phosphates. (Tricyclo[4.4.1.01,6]undeca-3,8-dien-11-ylidene)methanone and its Heptacyclic Dimer: a Dispirobridged Dipropellane (1,1″,4,4″,5,5″,8,8″-Octahydrodispiro[[4a, 8a]methanonaphthalene-9,1′-cyClobutane-3′,9″-[4a, 8a]methanonaphthalene]-2′, 4′-dione) (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 1930-1936 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dehalogenation of the mixed anhydride 6 of 11-bromotricyclo[4.4.1.01,6] undeca-3,8-diene-11-carboxylic acid (4) and of diethyl hydrogen phosphate with Zn-Ag couple in THF gave the dispiro-fused dipropellane 8(1,1″,4,4″,5,5″,8,8″-octahydrodispiro[[4a, 8a]methanonaphthalene-9,1′-cyclobutane-3′,9″-[4a, 8a]methanonaphthalene]-2′,4′-dione) in 58% yield. Unlike other dispiro[2.1.2.1]octane-4, 8-diones (see 2a-e), the new cyclodimer 8 is an O2-sensitive compound. The 11-bromobicyclo[4.4.1] undeca-1,3,5,7,9-pentaene-11-carboxylic acid (13) was prepared and converted into the acyl phosphate 14, which in turn was reduced with Zn-Ag couple in THF/MeOD to give the deuterated ester 16. Other cyclopropylidenemethanones could be generated and dimerized advantageously by the Zn-induced reduction of the mixed anhydride of the 1-bromocyclopropanecarboxylic acid and diethyl hydrogen phosphonate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710812
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  • 2
    Electronic Resource
    Electronic Resource
    Schwingungsrißkorrosion beschichteter Verdichterschaufel-Werkstoffe (1986)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 413-418 
    Details
    ISSN: 0933-5137
    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: Corrosion Fatigue of Coated Compressor Blade MaterialsDamage of compressor blades due to corrosion fatigue constitutes a substantial fraction of the observed stationary gas turbine failures. Dependent on environmental conditions and filtering, these blades in addition may be exposed to mechanical erosion. For corrosion fatigue protection, coatings have been used since many years. However, recently the earlier used NiCd coatings have been substituted to an increasing extent by inorganic coatings containing dispersed aluminum particles as manufactured e.g. by SermeTel. Such coatings are designed to warrant improved corrosion resistance. Within the scope of a joint research project of the German gas turbine manufacturers AEG KANIS, BBC and KWU, some of these protective coatings were tested under simulated operating conditions in different corrosive media with respect to their corrosion fatigue protection capabilities.As a result, it was shown that the aluminum dispersed coatings offer good protection against corrosion in aqueous neutral media at room temperature. One of the coatings tested guarantees in strongly acidious media only a time-limited corrosion protection. At elevated temperatures and also after erosive pre-damage, the fatigue strengths are reduced heavily. In comparison with uncoated specimens, galvanically or chemically deposited nickel-coatings, which were tested concurrently, improved the corrosion resistance only unessentially.
    Notes: Schäden an den Verdichterschaufeln von stationären Gasturbinen infolge von Schwingungsrißkorrosion stellen einen großen Teil der beobachteten Ausfallursachen dar. Zusätzlich sind diese Schaufeln je nach Umgebungsbedingungen mehr oder weniger starker Erosion ausgesetzt. Zum Schutz vor diesen Beanspruchungen werden seit Jahren Beschichtungen eingesetzt, wobei in letzter Zeit die zum Teil eingesetzten NiCd-Schichten vermehrt durch anorganische Schichten aus Chromat/Phosphat-Bindemitteln mit dispergierten Aluminiumpigmenten, z.B. der Firma SermeTel, ersetzt werden, die einen verbesserten Korrosionsschutz gewährleisten sollen. Im Rahmen eines gemeinsamen Forschungsprojektes der deutschen Gasturbinenhersteller AEG KANIS, BBC und KWU wurden einige dieser Schutzschichten in unterschiedlichen, betriebsnahen Korrosionsmedien auf ihre Schutzwirkung besonders gegen Schwingungsrißkorrosion hin untersucht.Als Ergebnis kann festgehalten werden, daß die aluminiumpigmentierten Schichten in neutralem Medium bei Raumtemperatur einen guten Korrosionsschutz bieten. Eine der Schichten gewährleistet in stark saurem Medium nur einen zeitlich begrenzten Korrosionsschutz. Bei höheren Temperaturen und auch nach erosiver Vorschädigung werden die ertragbaren Wechselamplituden dagegen sehr stark herabgesetzt. Parallel dazu geprüfte galvanisch oder chemisch abgeschiedene Nickelschichten verbesserten die Korrosionsbeständigkeit nur unwesentlich gegenüber unbeschichteten Proben.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19860171107
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  • 3
    Electronic Resource
    Electronic Resource
    Struktur-Wirkungs-Prinzipien von Korrosionsinhibitoren für die Rohöl- und ErdgasförderungHerrn Prof. Dr. W. Hilger zum 60. Geburtstag gewidmet (1989)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 40 (1989), S. 629-634 
    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: Structure efficiency relationships of corrosion inhibitors for oil and gas productionStructure efficiency relationships for quarternary ammonium compounds as corrosion inhibitors for oil and gas production were investigated in the system mild steel/aqueous NaCl solution (5 weight%, CO2 saturated) at T = 298 K and T = 343 K by Electrochemical Impedance Spectroscopy (EIS) and weight loss measurements. In-situ EIS measurements rapidly gave relatively accurate results on differential inhibitor efficiencies. Composition, thickness and inhibitor content of the inhomogeneous 3-D protecting layers formed on highly pure iron surfaces were determined by XPS measurements. The inhibition mechanism of the inhibitor used could be determined by its distribution within the 3-D protecting surface layer and is interpreted in terms of the interphase inhibition concept.
    Notes: Struktur-Wirkungs-Prinzipien von quartären Ammoniumverbindungen als Korrosionsinhibitoren für die Rohöl- und Erdgasförderung wurden anhand von Elektrochemischer Impedanz Spektroskopie (EIS) und Gewichtsverlustmessungen in Systemen C-Stahl/wäßrige NaCl-Lösung (5 Gew.%, CO2-gesättigt) bei T = 298 K und T = 343 K untersucht. Es konnte gezeigt werden, daß in-situ EIS Messungen rasch relativ genaue Resultate über differentielle Inhibitorwirksamkeiten liefern. Aus XPS Untersuchungen an Oberflächen aus Reinsteisen ließen sich Zusammensetzung, Dicke und Inhibitorgehalt der sich auf dem Substrat bildenden inhomogenen 3-D Deckschichten bestimmen. Der Wirkungsmechanismus des verwendeten Inhibitors konnte aus seiner Verteilung innerhalb der 3-D Deckschicht mit dem Konzept der Interphaseninhibition gedeutet werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19890401102
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  • 4
    Electronic Resource
    Electronic Resource
    Forschung in Hoechst, Jubiläumsjahr 1963. XVI, 727 Seiten mit 340, teils mehrfarbigen Abbildungen und 128 Tabellen. Verlag Chemie, GmbH., Weinheim/Bergstr. 1963. Ganzleinen DM 50, -  (1963)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 538-539 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19630140620
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  • 5
    Electronic Resource
    Electronic Resource
    Terpenes and Terpenoid Compounds, 14. Synthesis of Oxygenated Derivatives in the Tetramethyllimonene Series. New Odorants of the Wood-ambergris Type (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 396-402 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Terpene und terpenoide Verbindungen, 141).  -  Synthese oxygenierter Derivate in der Tetramethyllimonen-Reihe.  -  Neue Geruchsstoffe des Holz-Ambra-TypsEine einfache Darstellung von TM-α-Terpineol (4), cis-TM-β-terpineol (6c), trans-TM-β-Terpineol (6t), TM-Δ1,7,Δ8-Menthadien (7) und seinem spirocyclischen Epoxid (5) sowie von TM-Isokrypton (8) wird beschrieben (TM = Tetramethyl). Anders als die einfachen C10-Monoterpene zeigen einige der neuen tetramethylierten Derivate Holz-Ambra-Geruch.
    Notes: A practical preparation of TM-α-terpineol (4), cis-TM-β-terpineol (6c), trans-TM-β-terpineol (6t), TM-Δ1,7,Δ8-menthadiene (7), its spirocyclic epoxide (5), and TM-isocryptone (8) is described (TM = tetramethyl). Some of the new tetramethylated monoterpenes, unlike the simple C10-monoterpenes, have a woody-ambergis-like odour.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850215
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  • 6
    Electronic Resource
    Electronic Resource
    Terpene und terpenoide Verbindungen, 15. Darstellung von tetramethyliertem Perillaalkohol [3,3,5,5-Tetramethyl-4-(1-methylethenyl)-1-cyclohexen-1-methanol] und verwandten Monoterpenoiden (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 403-412 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Terpenes and Terpenoid Compounds, 15.  -  Preparation of Tetramethylated Perillyl Alcohol [3,3,5,5-Tetramethyl-4-(1-methylethenyl)-1-cyclohexene-1-methanol] and Related MonoterpenoidsLithium perchlorate-induced rearrangement of 1,3,3,5,5-pentamethyl-4-(1-methylethenyl)-7-oxabicyclo[4.1.0]heptane (2) in toluene furnishes the epimeric tetramethylated dihydrocarvones 4t, c and 2,2,4,4-tetramethyl-6-methylene-3-(1-methylethenyl)-trans-cyclohexanol (5) in varying ratio. In acetic acid and formic acid the allylic alcohol 5 rearranges smoothly into the corresponding esters 6a and 6b which have been saponified quantitatively to yield tetramethylperillyl alcohol 7. Oxidation of tetramethylperillaldehyde 8 with air affords tetramethylperillic acid 9 in 54% yield. The epoxidation products of 5, 6a, and 7 are described.
    Notes: Die Lithiumperchlorat-induzierte Umlagerung von 1,3,3,5,5-Pentamethyl-4-(1-methylethenyl)-7-oxabicyclo[4.1.0]heptan (2) in Toluol liefert die epimeren Tetramethyldihydrocarvone 4t, c sowie 2,2,4,4-Tetramethyl-6-methylen-3-(1-methylethenyl)-trans-cyclohexanol (5) in variablem Verhältnis. In Essigsäure und Ameisensäure lagert sich der Allylalkohol 5 glatt in die entsprechenden Ester 6a und 6b um, die mit Alkali quantitativ zum Tetramethylperillaalkohol 7 verseift werden. Oxidation von Tetramethylperillaaldehyd 8 mit Luftsauerstoff ergibt Tetramethylperillasäure 9 in 54% Ausbeute. Die Produkte der Epoxidierung von 5, 6a und 7 werden beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850216
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  • 7
    Electronic Resource
    Electronic Resource
    Terpene und terpenoide Verbindungen, 17. Darstellung oxygenierter Tetramethylmenthene und Tetramethylmenthadiene (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 756-764 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Terpenes and Terpenoid Compounds, 17. - Preparation of Oxygenated Tetramethylmenthenes and TetramethylmenthadienesThe hydroboration of rac-TM-limonene (1) (TM = tetramethyl) with 9-BBN is chemoselective and allows the functionalization of the isopropenyl side chain to give rac-TM-Δ1-p-Menthen-10-ol (4a, b), the corresponding aldehyde 5a, b, and the acid 6. Protonolysis of the product of hydroboration affords rac-TM-Δ1-p-menthene (7). Hydrochlorination of 1, epoxidation, and treatment with lithium diisopropylamide yields rac-TM-Δ1(7),8-p-menthadien-10-ol (9) which is rearranged by acid into rac-TM-Δ1,8-p-menthadien-10-ol (11).
    Notes: Die Hydroborierung von rac-TM-Limonen (1) (TM = Tetramethyl) mit 9-BBN ist chemoselektiv und erlaubt die gezielte Funktionalisierung der Isopropenylseitenkette zu rac-TM-Δ1-p-Menthen-10-ol (4a, b), dem entsprechenden Aldehyd 5a, b sowie der Säure 6. Durch Protonolyse des Hydroborierungsproduktes erhält man rac-TM-Δ1-p-Menthen (7). Hydrochlorierung von 1, Epoxidierung und Behandlung mit Lithiumdiisopropylamid liefert rac-TM-Δ1(7),8-p-Menthadien-10-ol (9), das durch Säure in rac-TM-Δ1,8-p-Menthadien-10-ol (11) umgelagert wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850411
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