Journal of the Chemical SocietyThe Society., 1963 |
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Page 1969
... proton sharp singlet while the 5- , 6- , 7- , and 8 - protons lead to a four - proton A , B , pattern . That the chemical shifts of the individual protons vary with solvent relative to one another as well as to benzene is shown by the ...
... proton sharp singlet while the 5- , 6- , 7- , and 8 - protons lead to a four - proton A , B , pattern . That the chemical shifts of the individual protons vary with solvent relative to one another as well as to benzene is shown by the ...
Page 1973
... protons 3 and 4 in 2 - nitronaphthalene shows that they should resonate at the same field strength , to yield a strong doublet split by ca. 1 c./sec . The strongest peak in the spectrum exactly matches this prediction although the ...
... protons 3 and 4 in 2 - nitronaphthalene shows that they should resonate at the same field strength , to yield a strong doublet split by ca. 1 c./sec . The strongest peak in the spectrum exactly matches this prediction although the ...
Page 2166
... proton to be coupled to the lone olefinic protons [ H1 , H2 ] but not the methylene protons ; 7.9-8.5 , complex band ( area 4 ) , methylene protons , one ( on C1 ) coupled to an outer diene proton [ H ] and two of them to free olefin ...
... proton to be coupled to the lone olefinic protons [ H1 , H2 ] but not the methylene protons ; 7.9-8.5 , complex band ( area 4 ) , methylene protons , one ( on C1 ) coupled to an outer diene proton [ H ] and two of them to free olefin ...
Contents
263 | 1371 |
Glucosides and aglycones from canary scrophulariaceae Part VI Structure | 1401 |
299 | 1403 |
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absorption acetic acid acetone added alcohol alkaline alumina Amax Amer anhydride aqueous arabinose atomic orbitals bands benzene benzyl bond bromide Calc carbon tetrachloride carbonyl CH₂ Chem chloride chloroform chromatography cm.¹ complex compounds concentrated cooled crystallised decomp derivative dilute distilled dried eluted ester ethanol ether ethyl acetate evaporated experimental extracted filtered fluorine Found fraction galactose gave ginkgetin give glycosides heated hydride hydrochloric hydrogen hydrolysis infrared spectrum iodide isolated isomer ketone light petroleum b. p. lithium aluminium hydride m. p. and mixed magnetic methyl glycosides mixed m. p. mixture mole molecular molecule needles nitrogen obtained oxidation perchlorate peroxide phenol polymers polysaccharide potassium precipitate prepared protons pyridine reaction reduced refluxed requires residue room temperature saturated sodium hydroxide solution solvent solvolysis spectra structure sugars sulphuric Table triethyl phosphite values yellow yield