Studies On Chemical Constituents Of Two Medicinal Plants

This thesis is composed of three chapters Chapter 1:IntroductionThis chapter is define the natural products,sources and importance in the life.Chapter 2:Isolation of Compounds from Calotropis gigantea?L.?Dry.ex Ait.Chemical constituents Calotropis gigantea?L.?Dry.ex Ait the identified seven compounds were isolated from the petroleum ether extract from the root of Calotropis gigantea?L.?Dry.ex Ait.f by a combination of Chromatographic techniques.1D and 2D-1H and 13C NMR techniques as well as Mass spectrometry?MS?.The structures of these isolated compounds were identified by NMR spectroscopy and mass spectroscopy as taraxasteryl acetate?C₁?,?-amyrin actate?C₂?,?-amyrin caprylate?C₃?,11-oxo-?-amyrinethylate?C₄?,11,12-Oxidotaraxerolacetate?C₅?,Germanicolacetate?C₆?,Calotropisis?C₇?.Among them compound C₇ is new.Chapter 3:Isolation of Compounds from Ziziphus spina-christi.Tow compounds were isolated from the ethyl acetate:chloroform extract of the stem bark of ziziphus spina-christi by a combination of chromatographic techniques.The structures of these isolated compounds were identified by NMR spectroscopy as Lupeol?Z₁?,Lupenone?Z₂?and one compound was isolated from methanol extract?stigmastreol glycoside?Z₃?,this compound frist time is being reported from this plant.