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the isomerisation of normal to isosapogenins
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absorption acetic acid acetone acetylene activation added addition Amer amine amount aqueous atom band base benzene boiling bond bromine Calc carbon carbon tetrachloride Chem chloride complex compound concentrated constant containing cooled corresponding crystallised crystals curves cyclic decomp derivative described determined dilute dissolved distilled disulphide dried effect energy ester ethanol ether evaporated EXPERIMENTAL experiments extracted filtered followed formation formed Found fraction further gave give glucose heated hydrochloric hydrogen hydroxide increased indicated infrared initial iodide isolated material method methyl mixed m. p. mixture mole needles observed obtained olefin oxide polysulphide position potassium precipitated prepared presence pressure prisms reaction reduction reflux removed requires residue room temperature salt separated showed shown similar sodium solid solution solvent spectrum stirred structure studied substituted sulphide sulphur Table thiol treated values washed yellow yield