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  • 1
    Electronic Resource
    Electronic Resource
    α,β-Unsaturated nitriles in heterocyclic synthesis: Synthesis of some new pyrazolo[1,5-a]pyrimidine derivatives (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 1413-1419 
    Details
    ISSN: 1434-4475
    Keywords: Cinnamonitriles ; Cyanoethylations ; Heterocycles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 3-Antipyrinyl-5-aminopyrazol (1) reagierte mit Acrylnitril zu 5-Amino-1-β-cyanoethyl-3-antipyrinylpyrazol (2).2 konnte ebenfalls aus der Reaktion von β-Cyanethylhydrazin (3) und Verbindung4 erhalten werden.2 wurde mittels Essigsäure-Salzsäure glatt zu 2-Antipyrinyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-on (5) cyclisiert.5 konnte auch aus der Reaktion von1 mit Methylacrylat erhalten werden. Die Reaktion von1 mit Zimtsäurenitrilderivaten7 a–e ergab die Pyrazolo[1,5-a]pyrimidin-Derivate9,11 und12.
    Notes: Abstract 3-Antipyrinyl-5-aminopyrazole (1) reacted with acrylonitrile to afford 5-amino-1-β-cyanoethyl-3-antipyrinylpyrazole (2). Compound2 could also be obtained from the reaction of β-cyanoethylhydrazine (3) and compound4.2 was readily cyclized into 2-antipyrinyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidin-5-one (5) by acetic-hydrochloric acid.5 could be also obtained from the reaction of1 and methyl acrylate. The reaction of1 and cinnamonitrile derivatives7 a–e resulted in the formation of pyrazolo[1,5-a]pyrimidine derivatives9,11 and12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00816340
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sulphur mineralisation in some New Zealand soils (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 68-74 
    Details
    ISSN: 1432-0789
    Keywords: C-bonded S ; Hydriodic acid-reducible S ; Incubation ; Potential S mineralisation ; S mineralisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An open incubation technique was used to measure S mineralisation in a range of New Zealand soils. For most of the soils studied, the release of S as sulphate was curvilinear with time, and during a 10-week incubation, the amounts of S mineralised ranged from less than 3 μg S g-1 soil to more than 26 μg S g-1 soil. The best predictor of mineralised S appeared to be the amount of C-bonded S in the soil (explaining 59% of the variation in mineralised S between soils). Examination of the soils after incubation also revealed that the bulk of the mineralised S was derived from the C-bonded S pool. Hydriodic acid-reducible forms of organic S appeared to make little contribution to mineralised S. Attempts were made to predict total potentially mineralisable S (S o) from incubation data using an exponential equation and a reciprocal-plot technique. However, the dependence of estimated values of S o on the length and temperature of incubation cast doubts on the validity of this approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335838
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    Paper (German National Licenses)
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