Quarterly Journal of the Chemical Society of London, Volume 21 |
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Page 3526
... carbonyl band at higher frequency in the i.r. region . However , these indigos isomerise ( cis to trans ) at tem- peratures far below that of ( IX ) ; in ( XII ; X = S ) the cis - isomer is converted into the trans - form in 32 h at ...
... carbonyl band at higher frequency in the i.r. region . However , these indigos isomerise ( cis to trans ) at tem- peratures far below that of ( IX ) ; in ( XII ; X = S ) the cis - isomer is converted into the trans - form in 32 h at ...
Page 3533
... carbonyl group is much more deshielded than a hydrogen atom ortho to a carbonyl group . Thus , formulae ( X ) ( carbonyl peri ) and ( XII ) ( carbonyl ortho ) appear justi- fied . In naphthalene - 1,2 - dicarboxylic acid anhydride ( V ) ...
... carbonyl group is much more deshielded than a hydrogen atom ortho to a carbonyl group . Thus , formulae ( X ) ( carbonyl peri ) and ( XII ) ( carbonyl ortho ) appear justi- fied . In naphthalene - 1,2 - dicarboxylic acid anhydride ( V ) ...
Page 3636
... carbonyl group is y to an aryl ring . Spin decoupling enabled the carbonyl location to be settled ; thus irradiation at 7-0 ( benzylic protons ẞ to carbonyl ) sharpened the 18- and 15 - H signals , and irradiation at τ 7.3 sharpened the ...
... carbonyl group is y to an aryl ring . Spin decoupling enabled the carbonyl location to be settled ; thus irradiation at 7-0 ( benzylic protons ẞ to carbonyl ) sharpened the 18- and 15 - H signals , and irradiation at τ 7.3 sharpened the ...
Contents
Organic chemistry | 3513 |
Partially fluorinated heterocyclic compounds Part IX The syntheses of 4567tetrafluorobenzobfuran | 3516 |
Reactions of cyclohexadienes Part XII Some dienamines and dimethyl acetylenedicarboxylate | 3517 |
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acetic acid acetic anhydride acetone alkyl Amer amine aqueous ethanol aromatic atom benzene benzene-light petroleum benzyl boiling boron tribromide bromide Calc carbonyl CH₂ CHCl3 Chem chloroform chromatography cm¯¹ cm¹ CO₂H compound condensation cooled crystallised decomp derivatives diazomethane dimer dimethyl dimethylformamide dioxan dried elution enol ergochrysin ester ethanol ether ethyl acetate EtOH evaporated extracted filtered Found gave give heated hydrogen chloride i.r. spectrum identical isolated isomers ketone log ɛ mass spectra methyl methylene mixed m.p. mixture myricanone n.m.r. spectrum nitrogen Nujol obtained olefinic oxidation petroleum Ph Ph Ph PhCH₂ phenolic potassium prepared prisms protons pyridine quinuclidine reaction refluxed requires residue ring room temperature S)-sulphoxide sclerotiorin signals singlet sodium hydrogen carbonate sodium hydroxide solid solution solvent stirred structure sulphoxide synthesis triethylamine vacuo W. B. Whalley washed yellow needles yield