Quarterly Journal of the Chemical Society of London, Volume 11 |
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Page 2292
... residue was chro- matographed on alumina with benzene - light petroleum ( 1 : 1 ) as eluant . The eluate from the first , red - green band was evaporated ; the residue crystallised from ether- methanol forming purple needles of ...
... residue was chro- matographed on alumina with benzene - light petroleum ( 1 : 1 ) as eluant . The eluate from the first , red - green band was evaporated ; the residue crystallised from ether- methanol forming purple needles of ...
Page 2293
... residue was chromatographed on alumina with benzene as eluant . The eluate from the first , red - purple band was evaporated ; the residue crystallised from chloroform- methanol forming purple needles ( 46 mg . , 22 % ) , m.p. 245— 248 ...
... residue was chromatographed on alumina with benzene as eluant . The eluate from the first , red - purple band was evaporated ; the residue crystallised from chloroform- methanol forming purple needles ( 46 mg . , 22 % ) , m.p. 245— 248 ...
Page 2478
... residue was extracted with chloroform ( 2 × 100 ml ) and the combined extracts were washed with aqueous 20 % sodium hydrogen carbonate solution ( 100 ml ) , dried ( MgSO1 ) , and evaporated . Ex- traction of the residue with hot light ...
... residue was extracted with chloroform ( 2 × 100 ml ) and the combined extracts were washed with aqueous 20 % sodium hydrogen carbonate solution ( 100 ml ) , dried ( MgSO1 ) , and evaporated . Ex- traction of the residue with hot light ...
Contents
Organic chemistry | 2023 |
Constituents of Withania somnifera Dun Part XII The withanolides of an Indian chemotype | 2032 |
Cyclic hydroxamic acids Part I Synthesis and reactions of 12dihydro1hydroxy46dimethyl2oxo | 2044 |
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acetic acid acetic anhydride acetone acetyl alcohol aldehyde alumina Amer amine ammonia anhydride anhydrous aqueous aromatic atom benzene benzyl bromide CH₂ Chem chloride chloroform chromatographed cm.¹ cm¯¹ cm¹ compound cooled crystallised cyclisation decomp derivative dichloromethane dilute dimer dimethyl dimethylformamide dioxan dried eluted ester ethanol ethyl acetate evaporated extracted with ether filtered filtrate Found gave give heated under reflux hydrochloric acid hydrolysis hydroxide i.r. spectrum iodide isolated isomer ketone lithium aluminium hydride methyl mixed m.p. mixture was stirred mmHg mmol mmole mole n.m.r. spectrum needles nitrogen obtained olefinic oxidation peroxide phenol potassium prepared protons pyridine reaction reduction reflux requires residue ring room temperature salt signals singlet sodium borohydride sodium hydroxide solid solution solvent spectra structure synthesis tetrahydrofuran treatment yield