Quarterly Journal of the Chemical Society of London, Volume 11 |
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Results 1-3 of 80
Page 2212
... dried in vacuo ( yield 8.2 g . , 90 % ) . The tetracycline base ( 10 g . ) in tetrahydrofuran ( 200 ml . ) and methyl iodide ( 24 ml . ) was protected from light and kept at room temperature for 4 days . The crystals were filtered off ...
... dried in vacuo ( yield 8.2 g . , 90 % ) . The tetracycline base ( 10 g . ) in tetrahydrofuran ( 200 ml . ) and methyl iodide ( 24 ml . ) was protected from light and kept at room temperature for 4 days . The crystals were filtered off ...
Page 2214
... dried , and evaporated to give the amide ( XXXIII ; R = Me ) ( 1 · 04 g . ) , m.p. ( from chloroform ) 242-244 ° , 3420 , 3200 , 1690 , 1668 , and 1608 cm . - 1 , ≈ 7 · 42 ( 3H , s ) , 6 · 11 ( 3H , s ) , 6 · 08 ( 3H , s ) , 3.26 ( 1H ...
... dried , and evaporated to give the amide ( XXXIII ; R = Me ) ( 1 · 04 g . ) , m.p. ( from chloroform ) 242-244 ° , 3420 , 3200 , 1690 , 1668 , and 1608 cm . - 1 , ≈ 7 · 42 ( 3H , s ) , 6 · 11 ( 3H , s ) , 6 · 08 ( 3H , s ) , 3.26 ( 1H ...
Page 2361
... dried over Na2SO1 ) . The filtered solution was con- centrated to a small volume and subjected to t.l.c. ( silica gel ; ethyl acetate ) . A band ( RF 0 · 8 ) which strongly absorbed u.v. light at 254 nm was collected and extracted with ...
... dried over Na2SO1 ) . The filtered solution was con- centrated to a small volume and subjected to t.l.c. ( silica gel ; ethyl acetate ) . A band ( RF 0 · 8 ) which strongly absorbed u.v. light at 254 nm was collected and extracted with ...
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