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  • Lunar and Planetary Science and Exploration  (8)
  • Male  (7)
  • Organic Chemistry  (7)
  • 2015-2019  (1)
  • 2010-2014  (9)
  • 2000-2004  (4)
  • 1980-1984  (7)
  • 1940-1944  (1)
  • 1930-1934
  • 1
    Digitale Medien
    Digitale Medien
    Synthesis, Properties, and Crystal Structure of Silyl Nitronates (Silyl Esters of aci-Nitroalkanes): Towards the SN2 Reaction Path with Retention of Configuration at Silicon (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 697-710 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An efficient and flexible method for the preparation of silyl nitronates is described (see 1-10). NMR. spectral investigations indicate a rapid 1,3-silyl migration process, with an activation energy of about 10 kcal mol-1. X-ray crystallographic studies on the silyl nitronates 3 and 8 show structures that lean towards an SN2 retention pathway at silicon.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19800630320
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  • 2
    Digitale Medien
    Digitale Medien
    Erhöhung der Nachweisempfindlichkeit von Cyclosporin A durch Derivatisierung mit 2-Naphthylselenylchlorid (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 728-732 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Enhancement of Detection Sensitivity of Cyclosporin A by Derivatization with 2-NapthylselenylchlorideThe UV./HPLC. detection sensitivity of cyclosporine A 1, an immunosuppressive cyclic undecapeptide containing one D-aminoacid and seven N-methylated aminoacids, is enhanced by a factor of 3-4 (limit of detection 5 ng) by conversion of the characteristic side chain of amino-acid-1 to the β-naphthylseleno-substituted tetrahydrofuran derivative 4.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19800630323
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  • 3
    Digitale Medien
    Digitale Medien
    Herstellung von 1, 3-Diketonen und von Nitro-diketonen durch (1:1)-Acylierungen von Lithiumenolaten mit Acylchloriden (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 716-735 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Preparation of 1,3-Diketones and of Nitro-diketones by (1:1)-Acylation of Lithium Enolates with Acyl ChloridesSlow addition of precooled solutions of lithium enolates in THF (Fig. 1) to solutions of equimolar amounts of acyl chlorides in the same solvent at temperatures between - 80 and - 100° furnishes 1, 3-diketones in acceptable to good yields (Tables 1-3). Even 3-nitropropionyl and 4-nitrobutyryl chloride can be employed for the (1:1)-acylation of enolates to give the synthetically useful 5- and 6-nitro-1, 3-diketones 13 and 25, respectively. The scope and the limitations of this method of preparing 1, 3-diketones are given and are compared with alternative methods.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19810640313
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  • 4
    Digitale Medien
    Digitale Medien
    Improved Nitroaldol Reactions and Reductive Routes to Vicinal AminoalcoholsDedicated to Prof. Vladimir Prelog on the occasion of his 75th birthday (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 2264-2271 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Regioselective and flexible procedures are described for the preparation of a variety of protected vicinal nitroalcohols 1, 3 and 5 (see Scheme 5), as is an efficient method for their reduction to the corresponding vicinal aminoalcohols 2, 4 and 6.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19810640732
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  • 5
    Digitale Medien
    Digitale Medien
    Diastereoselective Synthesis of Nitroaldol DerivativesPart of the results described here was mentioned previously in a review article [1] and in a communication [2]. (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1101-1133 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Three methods are described by which diastereomerically enriched nitroaldols and their O-silylated derivatives can be prepared. threo-Nitroaldols prevail up to 10:1 over the erythro-isomers if doubly deprotonated nitroaldols 28 are quenched with acetic acid (THF/HMPT or DMPU, - 100°) (see Scheme 5 and Table 2). O-Trimethyl- or O-(t-butyl)dimethylsilylated (TBDMSi) erythro-nitroaldols can be obtained by protonation of the corresponding lithium nitronates (35, 39) in THF at low temperature (see Schemes 6 and 7). The erythro-O-TBDMSi-nitroaldol derivatives are also formed in the fluoride catalyzed addition of TBDMSi-nitronates (40-45) to aldehydes (see Schemes 8 and 9), In the latter reaction no 1,2-asymmetric induction is observed if a-branched silylnitronates or aldehydes are employed (see 48/49 and 50/51) - The stereochemical course of the reactions leading to erythro-O-TBDMSi-nitroaldols follows topological rules of broad applicability (see Scheme 10); possible mechnisms are discussed. - The configuration of diasteromerically 13C-NMR. Spectroscopy. - Some examples of the preparation of diastereimerically enriched 1,2-aminolcohols by reduction of the correspondence nitro compounds without loss of configurational purity are described (see Schemes 11 and 12).
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19820650402
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  • 6
    Digitale Medien
    Digitale Medien
    Über eine Räumlich-energetische Ursache der Komplexbildung (1940)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 156 (1940), S. 227-240 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 1. Als Überspannung oder Hypertension der Moleküle wird ein Zustand bezeichnet, bei dem die Moleküle aus den Elementen unter starker Kontraktion, aber relativ geringer Energieabgabe entstanden sind. Die Valenzelektronen befinden sich daher in einem mehr oder weniger hochangeregten Zustand und suchen durch Eingehen neuer, komplexchemischer Reaktionen in einen stabileren Zustand überzugehen.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19401560706
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  • 7
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Verseifung aromatischer SulfochlorideHerrn Professor Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 36-40 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on the Hydrolysis of Aromatic SulfochloridesThe hydrolysis of aromatic sulfochlorides can bei described by a second-order law. Due to the strength of the base the constants of velocity are between 10-6 (H2O) or 103 (OH-) 1 mol -1 s-1 respectively. The reaction of benzensulfochlorides proceeds according to an addition-elimination mechanism, whereas benzylic sulfochlorides, reacting with a strong base, proceed to an elimination-addition mechanism.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19833250105
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  • 8
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    Sex-biased hatching order and adaptive population divergence in a passerine bird (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2002-01-12
    Beschreibung: Most species of birds can lay only one egg per day until a clutch is complete, and the order in which eggs are laid often has strong and sex-specific effects on offspring growth and survival. In two recently established populations of the house finch (Carpodacus mexicanus) in Montana and Alabama, breeding females simultaneously adjusted the sex and growth of offspring in relation to their position in the laying order, thereby reducing the mortality of sons and daughters by 10 to 20% in both environments. We show experimentally that the reduction in mortality is produced by persistent and sex-specific maternal effects on the growth and morphology of offspring. These strong parental effects may have facilitated the rapid adaptive divergence among populations of house finches.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Badyaev, Alexander V -- Hill, Geoffrey E -- Beck, Michelle L -- Dervan, Anne A -- Duckworth, Renee A -- McGraw, Kevin J -- Nolan, Paul M -- Whittingham, Linda A -- New York, N.Y. -- Science. 2002 Jan 11;295(5553):316-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA. abadyaev@selway.umt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11786641" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Adaptation, Physiological ; Alabama ; Animals ; Behavior, Animal ; *Biological Evolution ; Body Weight ; Ecosystem ; Environment ; Female ; Male ; Montana ; Oviposition ; *Reproduction ; Selection, Genetic ; *Sex Characteristics ; Sex Ratio ; Songbirds/anatomy & histology/growth & development/*physiology ; Tarsus, Animal/anatomy & histology/growth & development
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
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    Miniature genome in the marine chordate Oikopleura dioica (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2001-12-26
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seo, H C -- Kube, M -- Edvardsen, R B -- Jensen, M F -- Beck, A -- Spriet, E -- Gorsky, G -- Thompson, E M -- Lehrach, H -- Reinhardt, R -- Chourrout, D -- New York, N.Y. -- Science. 2001 Dec 21;294(5551):2506.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sars [corrected] Centre for Marine Molecular Biology, Thormo- hlensgt. 55, 5020 Bergen, Norway.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11752568" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Chromosomes, Artificial, Bacterial ; Ciona intestinalis/genetics ; Cloning, Molecular ; DNA, Complementary ; DNA, Intergenic ; Expressed Sequence Tags ; Genes ; *Genome ; Introns ; Male ; Repetitive Sequences, Nucleic Acid ; Sequence Analysis, DNA ; Spermatozoa/chemistry ; Urochordata/anatomy & histology/*genetics/growth & development
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    Balancing selection at the prion protein gene consistent with prehistoric kurulike epidemics (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2003-04-12
    Beschreibung: Kuru is an acquired prion disease largely restricted to the Fore linguistic group of the Papua New Guinea Highlands, which was transmitted during endocannibalistic feasts. Heterozygosity for a common polymorphism in the human prion protein gene (PRNP) confers relative resistance to prion diseases. Elderly survivors of the kuru epidemic, who had multiple exposures at mortuary feasts, are, in marked contrast to younger unexposed Fore, predominantly PRNP 129 heterozygotes. Kuru imposed strong balancing selection on the Fore, essentially eliminating PRNP 129 homozygotes. Worldwide PRNP haplotype diversity and coding allele frequencies suggest that strong balancing selection at this locus occurred during the evolution of modern humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mead, Simon -- Stumpf, Michael P H -- Whitfield, Jerome -- Beck, Jonathan A -- Poulter, Mark -- Campbell, Tracy -- Uphill, James B -- Goldstein, David -- Alpers, Michael -- Fisher, Elizabeth M C -- Collinge, John -- New York, N.Y. -- Science. 2003 Apr 25;300(5619):640-3. Epub 2003 Apr 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Prion Unit, and Department of Neurodegenerative Disease, Institute of Neurology, University College, Queen Square, London WC1N 3BG, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12690204" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Animals ; Cannibalism ; Child ; Codon ; Creutzfeldt-Jakob Syndrome/genetics ; Disease Outbreaks/*history ; Ethnic Groups/*genetics ; Female ; Gene Frequency ; Haplotypes ; Heterozygote ; History, 19th Century ; History, 20th Century ; History, Ancient ; Homozygote ; Humans ; Immunity, Innate ; Kuru/epidemiology/genetics/*history/transmission ; Linkage Disequilibrium ; Male ; Methionine/genetics ; Middle Aged ; Mutation ; Papua New Guinea/epidemiology ; *Polymorphism, Genetic ; PrPC Proteins/*genetics ; *Selection, Genetic ; Valine/genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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