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Pąki brzozy brodawkowatej (Betula pendula) oraz brzozy omszonej (Betula pubescens) poddano ekstrakcji ditlenkiem węgla w stanie nadkrytycznym (300 bar, 50°C). Wydajność procesu wynosiła odpowiednio 25,27 ± 1,27% i 19,73 ± 1,72%. Skład chemiczny ekstraktów oznaczono metodą chromatografii gazowej sprzężonej ze spektrometrią mas. Stwierdzono, że wyciągi są bogate w substancje biologicznie aktywne (seskwiterpeny,...
Despite the differences in ploidy and in the timing of flowering, two species of white birch, Betula pendula and Betula pubescens often form viable hybrids in places of their joint growth. Recognition of such hybrids by their morphological features is very difficult or impossible. On the other hand, it could be assumed that substantial differences can be found in the secondary metabolites whose composition...
Tropinone (8-methyl-8-azabicyclo[3.2.1]octan-3-one) metal (Li, Na, K, Mg) enolates were used to achieve α-alkylation. The reactions, regardless of the metal or conditions used, were low-yielding. N,N-Dimethylhydrazones of tropinone and granatanone (pseudopelletierine, 9-methyl-9-azabicyclo[3.3.1]nonan-3-one) were prepared and α-alkylated using n-butyllithium as the lithiating reagent. Lithium amides,...
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