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Diosgenin: Quiz


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Question 1: Hydrolysis of this ________ leads to scission of the trisaccharide at the 3-position and the formation of the aglycone, diosgenin.
SaponinGinsenosideTriterpenoid saponinsGlycoside

Question 2: The presence of the olefin at C-17 allows ready entry to C-19 ________ and provides the necessary function for the synthesis of potent C-16- and C-16,17-substituted corticosteroids.

Question 3: [4] The unmodified steroid has estrogenic activity[5] and can reduce the level of serum ________.
AtherosclerosisTrans fatCholesterolLow-density lipoprotein

Question 4: The ________ dioscin from the Mexican wild yam root, Dioscorea, constituted the first plant source for steroid drugs.

Question 5: Treatment of this acetal with hot ________ in the presence of toluenesulfonic acid leads initially to protonation of one of the acetal oxygens followed by elimination to form an enol ether.
Methyl iodideEthanolAcetic anhydrideAcetic acid

Question 6: The sugar-free (aglycone), diosgenin is used for the commercial synthesis of cortisone, pregnenolone, ________, and other steroid products.

Question 7: Heating that intermediate in with alcoholic ________ leads to the elimination of the ester grouping beta to the ketone; there is thus obtained 16-dehydropregnenolone acetate.
Sodium hydroxideSodium hypochloriteSodium carbonateSodium sulfate

Question 8: Diosgenin is the precursor for the semisynthesis of progesterone[3] which in turn was used in early ________.
Combined oral contraceptive pillDepo-ProveraHormonal contraceptionEmergency contraception

Question 9: Diosgenin, a steroid sapogenin, is the product of hydrolysis by acids, strong bases, or enzymes of ________, extracted from the tubers of Dioscorea wild yam, such as the Kokoro.
SaponinTriterpenoid saponinsGinsenosideGlycoside


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