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  • 1
    Electronic Resource
    Electronic Resource
    Ordered HGMS filters in the transverse configuration (1987)
    Springer
    Applied physics 44 (1987), S. 161-166 
    Details
    ISSN: 1432-0630
    Keywords: 85.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A numerical solution for the Navier-Stokes equation is obtained for the flow conditions in an ordered high-gradient magnetic filter. Hence, capture efficiencies are calculated for this filter operated in the transverse configuration, with field, flow, and collector-wire axis mutually perpendicular. Good agreement with experiment is obtained over a wide range of filter parameters. Comparisons are made with results obtained by other models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626418
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  • 2
    Electronic Resource
    Electronic Resource
    Particle accumulation on a single wire in transverse HGMS configuration (1987)
    Springer
    Applied physics 42 (1987), S. 117-124 
    Details
    ISSN: 1432-0630
    Keywords: 85.70 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An experimental investigation of particle accumulation on a single wire in the transverse HGMS configuration is presented. For saturation buildup we obtain a monotonic decrease of the coefficient of static frictionf sat with the flow velocityv a on the basis of the “friction model”. The power law of the dependence of the saturation accumulation area onv a , predicted by this model, is experimentally verified. Furthermore, we present an empirical law describing the dependence of the accumulation area on timeτ and on flow velocityv a for the entire buildup process. From the investigation of the initial accumulation we conclude that existing theories of the so-called capture radius do not satisfactorily describe the situation near the end of a capture wire.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616720
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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