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  • 1
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    Charcoal records of two sediment cores off SW Africa (2012)
    PANGAEA
    In:  Supplement to: Daniau, Anne-Laure; Bartlein, Patrick J; Harrison, S P; Prentice, Iain Colin; Brewer, Simon; Friedlingstein, Pierre; Harrison-Prentice, T I; Inoue, J; Izumi, K; Marlon, Jennifer R; Mooney, Scott D; Power, Mitchell J; Stevenson, J; Tinner, Willy; Andric, M; Atanassova, J; Behling, Hermann; Black, M; Blarquez, O; Brown, K J; Carcaillet, C; Colhoun, Eric A; Colombaroli, Daniele; Davis, Basil A S; D'Costa, D; Dodson, John; Dupont, Lydie M; Eshetu, Z; Gavin, D G; Genries, A; Haberle, Simon G; Hallett, D J; Hope, Geoffrey; Horn, S P; Kassa, T G; Katamura, F; Kennedy, L M; Kershaw, A Peter; Krivonogov, S; Long, C; Magri, Donatella; Marinova, E; McKenzie, G Merna; Moreno, P I; Moss, Patrick T; Neumann, F H; Norstrom, E; Paitre, C; Rius, D; Roberts, Neil; Robinson, G S; Sasaki, N; Scott, Louis; Takahara, H; Terwilliger, V; Thevenon, Florian; Turner, R; Valsecchi, V G; Vannière, Boris; Walsh, M; Williams, N; Zhang, Yancheng (2012): Predictability of biomass burning in response to climate changes. Global Biogeochemical Cycles, 26(4), https://doi.org/10.1029/2011GB004249
    Details
    Publication Date: 2024-05-27
    Description: We analyze sedimentary charcoal records to show that the changes in fire regime over the past 21,000 yrs are predictable from changes in regional climates. Analyses of paleo- fire data show that fire increases monotonically with changes in temperature and peaks at intermediate moisture levels, and that temperature is quantitatively the most important driver of changes in biomass burning over the past 21,000 yrs. Given that a similar relationship between climate drivers and fire emerges from analyses of the interannual variability in biomass burning shown by remote-sensing observations of month-by-month burnt area between 1996 and 2008, our results signal a serious cause for concern in the face of continuing global warming.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Welche C-C-Bindung wird bei der Hydrierung von Basketanderivaten geöffnet? (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2992-3000 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Which Bond is Cleaved by Hydrogenation of Basketane Derivatives?When basketane (2), its cis- and trans-9,10-dimethyl dicarboxylate 10 and 16, and its cis-9,10-dicarbonic acid anhydride 22 are hydrogenated over Pd-catalysts in contrast to an earlier report no symmetrical derivatives of 3 are formed. An unsymmetrical bond between C3 and C4 or C4 and C7 is opened. This is shown by the n.m.r. spectra of the hydrogenated esters 11,13,17 and 19 as well as by the n.m.r. spectrum of olefin 15 obtained by degradation of all the esters. On hydrogenation olefin 15 yields the same hydrocarbon 8 as basketane (2); correspondingly from 7 and 25 the compounds 9 and 26 are obtained. The origin of the observed bond cleavage on hydrogenation of these cage compounds is discussed.
    Notes: Bei der Hydrierung von Basketan (2), dessen cis- und trans-9,10-Dicarbonsäuredimethylester 10 und 16 sowie dessen cis-9,10-Dicarbonsäureanhydrid 22 über Pd-Katalysatoren wird nicht, wie früher angenommen, die C4-C5-Bindung zu den symmetrischen Derivaten von 3 geöffnet, sondern eine unsymmetrische Bindung zwischen C3 und C4 bzw. C4 und C7. Sowohl die NMR-Spektren der hydrierten Ester 11, 13, 17 und 19 als auch das des aus allen Estern erhaltenen Olefins 15 beweisen diese Feststellung. Bei der Hydrierung des Olefins 15 entsteht der gleiche Kohlenwasserstoff 8 wie aus Basketan (2), aus 7 und 25 werden dementsprechend 9 und 26 erhalten. Es wird versucht, die experimentelle Antwort auf die Titelfrage zu begründen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060930
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enantiospecific Synthesis of 2,5-Disubstituted Piperidine Derivatives: Synthesis of (+)-Pseudoconhydrine (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1267-1272 
    Details
    ISSN: 0947-3440
    Keywords: Alkaloids ; Enantiospecific synthesis ; Chiral building blocks ; 2,5-Disubstituted piperidines ; (+)-Pseudoconhydrine ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel methodology for the synthesis of any one of the four stereoisomers of a 2,5-disubstituted piperidine in optically pure form is described, starting from readily available chiral building blocks 10 and 11 (or their antipodes). The utility of this approach is demonstrated in the total synthesis of (+)-pseudoconhydrine hydrochloride, the structure of which was confirmed by X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970633
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    Paper (German National Licenses)
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