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  • 1
    Electronic Resource
    Electronic Resource
    Molybdenum distribution in Precambrian rocks of the Colorado Mineral Belt (1987)
    Springer
    Mineralium deposita 22 (1987), S. 47-52 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The average Mo content of more than one hundred rock samples from the Precambrian basement of the Colorado Mineral Belt corresponds well to the global molybdenum content of crustal rocks of 1.0 ppm. There are no indications of a regional geochemical molybdenum anomaly in that part of the crust or upper mantle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204243
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  • 2
    Electronic Resource
    Electronic Resource
    Globale chemische Fraktionierungstrends und Lagerstättenbildung (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 108-114 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131765
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  • 3
    Electronic Resource
    Electronic Resource
    Globale chemische Fraktionierungstrends und Lagerstättenbildung (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 108-114 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract. The Earth's history is characterized by chemical dynamics in which a few fundamental petrological processes control the formation of several global geochemical reservoirs with specific element distribution patterns. These reservoirs provide the chemical and physical background for magmatic, hydrothermal and sedimentary redistribution processes. The ultimate outcome of these fractionation processes at very advanced stages is local metal enrichment to ore grade as a complementary feature of large-scale metal depletion in individual geochemical reservoirs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131765
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  • 4
    Electronic Resource
    Electronic Resource
    A Precambrian core sample from the Altiplano/Bolivia (1978)
    Springer
    International journal of earth sciences 67 (1978), S. 270-278 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Drilling in the Bolivian Altiplano discovered the Precambrian basement at 2.744 m of depth, Paleozoic strata lacking. The core is composed of hornblende meta-granite (hornblende granoblastite), in the upper part of biotite meta-granite (biotite granoblastite). Radiometric dating provides evidence for a Grenvillian magmatic or anatectic rock formation (1.050±100 my) and a later metamorphic event of 530±30 my in age.
    Abstract: Résumé Lors d'un forage dans l'Altiplano bolivien le substratum précambrien a été rencontré à une profondeur de 2.744 m. La couverture sédimentaire comprend des couches tertiaires et crétaciques. La carotte précambrienne se compose d'un micro-granite gneissique de l'assemblage hornblende — feldspath potassique — quartz — plagioclase et d'un microgranite gneissique de biotite — feldspath potassique — quartz — plagioclase. L'âge de constitution de la roche est d'après l'analyse Rb-Sr de 1.050 ± 100 my. L'analyse K-Ar laisse supposer une transformation métamorphique de 530 ± 30 my.
    Notes: Zusammenfassung In einem Bohraufschluß vom Altiplano in Bolivien wurde in 2.744 m Teufe unter tertiärer und kretazischer Bedeckung das präkambrische Basement angetroffen. Der präkambrische Bohrkern besteht teils aus Hornblende-Meta-Granit (Hornblende-Kalifeldspat-Quarz-Plagioklas-Gneis), teils aus Biotit-Meta-Granit (Biotit-Kalifeldspat-Quarz-Plagioklas-Gneis). Nach Rb-Sr Datierung dürfte das Bildungsalter etwa 1.050±100 my betragen, eine Aufheizungsperiode um 530±30 my ist nach K-Ar Analyse zu vermuten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01803266
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Synthese von 1,2,4-Triazinen, VII: Synthese von Dialkylamino- und Methoxy-1,2,4-triazinen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1113-1119 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 1,2,4-Triazines, VII: Synthesis of Dialkylamino- and Methoxy-1,2,4-triazinesStarting with 3,5,6-trichloro-1,2,4-triazine (1j) some dialkylamino-and methoxy-1,2,4-triazines 1a-i, 1m, 1p-v are prepared.
    Notes: Ausgehend von 3,5,6-Trichlor-1,2,4-triazin (1j) werden eine Reihe von Dialkylamino- und Methoxy-1,2,4-triazinen 1a-i, 1m, 1p-v dargestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090333
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  • 6
    Electronic Resource
    Electronic Resource
    Enantioselective Synthesis of the Hydroxy-Analogues of D-and L-Methionine (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 18 (1979), S. 797-797 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197907971
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  • 7
    Electronic Resource
    Electronic Resource
    Cycloadditionen mit Azabenzolen, VIII1) Reaktionen von Dimethylamino- und Methoxypyrimidinen mit Acetylendicarbonsäure-dimethylester (1975)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 1113-1119 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions with Azabenzenes, VIII1). - Reactions of Dimethylamino-and Methoxyprimidines with Dimethyl AcetylenedicarboxylateThe pyrimidines 2a-2i react with dimethyl acetylenedicarboxylate (1) in boiling dimethylformamide by a [4 + 2]-cycloaddition reaction, forming the pyridines 4a-4e. Compounds 4a and 4d react with 1 giving tetramethyl 3-dimethylaminobenzene-1,2,4,5-tetracarboxylate (5).
    Notes: Die Pyrimidine 2a-2i reagieren mit Acetylendicarbonsäure-dimethylester (1) in siedendem Dimethylformamid über eine [4 + 2]-Cycloaddition zu den Pyridinderivaten 4a-4e, von denen sich 4a und 4d mit 1 zu 3-Dimethylaminobenzol-1,2,4,5-tetracarbonsäure-tetramethylester (5) weiter umsetzen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197519750609
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  • 8
    Electronic Resource
    Electronic Resource
    Cycloadditionen mit Azabenzolen, XI. Cycloadditionen mit Methoxy- und Dialkylamino-1,2,4-triazinen (1977)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1413-1420 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions with Azabenzenes, XI. - Cycloaddition Reactions with Methoxy-and Dialkylamino-1,2,4-triazinesThe methoxy-1,2,4-triazines 2a - 2c and 11 as well as 3-dimethylamino-1,2,4-triazine (2e) react with the electron-rich dienophile N,N-diethyl-1-propynylamine (3) via a [4 + 2]-cycloaddition reaction. 1,2,4-Triazines 2g-2j containing 2 or 3 dialkylamino groups react only with the electron-deficient dienophile dimethylacetylene dicarboxylate (1) via a [4 + 2]-cycloaddition reaction.
    Notes: Die Methoxy-1,2,4-triazine 2a-2c und 11 sowie das 3-Dimethylamino-1,2,4-triazin (2e) reagieren mit dem elektronenreichen Dienophil N.N-Diethyl-1-propinylamin (3) im Sinne einer [4 + 2]-Cycloaddition. 1,2,4-Triazine 2g - 2j mit 2 oder 3 Dialkylaminogruppen lassen sich dagegen mit dem elektronenarmen Dienophil Acetylendicarbonsäure-dimethylester (1) im Sinne einer [4 + 2]-Cycloaddition umsetzen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197719770902
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Chemie der 1,2,4-Triazine, VIII. Struktur eines Reaktionsproduktes von 3-(p-Tolyl)-1,2,4-triazinen mit Acetylendicarbonsäure-dimethylester (1977)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1421-1428 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of 1,2,4-Triazines, VIII. -Structure of a Reaction Product from 3-(p-Tolyl)-1,2,4-triazines and Dimethyl AcetylenedicarboxylateThe 3-(p-tolyl)substituted 1,2,4-triazines 1a - 1c react with dimethyl acetylendicarboxylate (2) in glacial acetic acid/acetic anhydride forming in addition to the pyrido-1,2,4-triazines 3 the 1,2-bis(methoxycarbonyl)-2-(1,2,4-triazin-1-io-1-yl) vinylates 4a - 4c, whose structures were determined by X-ray analysis of 4a.
    Notes: Die 3-(p-tolyl)substituierten 1,2,4-Triazine 1a - 1c bilden mit Acetylendicarbonsäure-dimethylester (2) in Eisessig/Acetanhydrid neben den Pyrido-1,2,4-triazine 3 die 1,2-Bis(methoxycarbonyl)-2-(1,2,4-triazin-1-io-1-yl)vinylate 4a - 4c, deren Struktur durch Röntgenstrukturanalyse von 4a bestimmt wurde.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197719770903
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  • 10
    Electronic Resource
    Electronic Resource
    Cycloadditionen mit Azabenzolen, XII. Reaktionen von 1,2,4-Triazinen mit Acetylendicarbonsäuredimethylester (1977)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1718-1724 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions with Azabenzenes, XII. - Reactions of 1,2,4-Triazines with Dimethyl AcetylenedicarboxylateReaction of the 1,2,4-triazines 1b - 1e with dimethyl acetylendicarboxylate (2) affords the pyrrolo[2.1-f][1,2,4]triazines 5b - 5f. Interaction of 1b with 2 without a solvent yields, besides 5b, the pyrido[2.1-f][1,2,4]triazine 7c and the [1,3]oxazino[2.3-f][1,2,4]triazine 11.
    Notes: Reaktion der 1,2,4-Triazine 1b - 1e mit Acetylendicarbonsäure-dimethylester (2) ergibt die Pyrrolo[2.1-f][1,2,4]triazine 5b - 5f. Bei der Umsetzung von 1b mit 2 ohne Lösungsmittel wurden neben 5b auch das Pyrido[2.1-f][1,2,4]triazin 7c und das [1,3]Oxazino[2,3-f][1,2,4]-triazin 11 erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197719771018
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