Browsing Department of Chemistry by Author "Obuya Were, Michael Benn, Raphael Munavu"

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    • Chinchona Alkaloid from Dendrosenecio kilimanjari subsp. cottonii 

      Obuya Were, Michael Benn, Raphael Munavu (Georg Thieme Verlag Stuttgart· New York, 1997-02)
      Investigation of the Tanzanian Dendrosenecio kilimanjari subsp. cottonii resulted in the isolation of the cinchona alkaloid, cinchonidine (2). Conversion of cinchonidine to deoxy-cinchonidine was achieved in high yield ...

    • Errata. Pyrrolizidine Alkaloids from Senecio hadiensis 

      Obuya Were, Michael Benn, Raphael Munavu (American Chemical Society, 1991-09)
      17-Oxosparteine (1 mg), -isolupanine (3 mg), and N-methylcytisine (2 mg) were iden- tified by ms and tic comparisons with authentic samples (6,8). Catalytic reduction (2 mg) of 5,6-dehydrolu- panine (4 mg), oil, ms (9) ...