Quarterly Journal of the Chemical Society of London, Volume 1 |
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Page 909
... temperature phase . How- ever , this impurity was driven off by keeping the sample at elevated temperatures ( ca. 400 K ) in a flow of dry nitrogen for several hours . This final purification was performed in the 1H n.m.r. probe itself ...
... temperature phase . How- ever , this impurity was driven off by keeping the sample at elevated temperatures ( ca. 400 K ) in a flow of dry nitrogen for several hours . This final purification was performed in the 1H n.m.r. probe itself ...
Page 1014
... temperature spectrum and the rotational average coupling constant was 0.7 Hz from the higher - temperature spectrum . In N - methyltrifluoroacetamide , the coupling constants J ( NH , Me ) = 4 · 8 Hz , J ( NH , CF3 ) = 1 · 1 Hz , and J ...
... temperature spectrum and the rotational average coupling constant was 0.7 Hz from the higher - temperature spectrum . In N - methyltrifluoroacetamide , the coupling constants J ( NH , Me ) = 4 · 8 Hz , J ( NH , CF3 ) = 1 · 1 Hz , and J ...
Page 1211
... temperature probe and a Varian V6040 temperature controller were used . Chemical shifts were calibrated by use of a Varian V4315 counter . Temperatures were measured by inserting a dummy tube , filled to the same depth with the same ...
... temperature probe and a Varian V6040 temperature controller were used . Chemical shifts were calibrated by use of a Varian V4315 counter . Temperatures were measured by inserting a dummy tube , filled to the same depth with the same ...
Contents
Physical organic chemistry | 1 |
Contents | 6 |
Kinetics and mechanism of electrophilic substitution of heteroaromatic compounds Part XXIV Acid | 11 |
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A2 mechanism acetic acid-catalysed addition alcohol alkaline hydrolysis Amer analysis anion aqueous aromatic benzene benzoate bond bromine cal mol-1 calculated carbon atom carbonium ion carbonyl catalysis Chem Chemistry chlorine compounds concentration conjugate conjugate acid correlation deuterium diastereomers dienamines dioxan electron pairs energy entropies of activation epoxide equation esters ether ethylene exchange experimental Figure formation glycol H₂O hydrogen hydroxide hypochlorous acid indicate intramolecular isomer isotope effects k₁ k₂ ketone kinetic MeOH methanol methanolysis methiodide method methyl mixture mmHg mol-¹ molecular molecule n-pentyl n.m.r. spectra nitration nucleophilic observed obtained olefin oxidation oxygen p-xylene parameters perchloric acid Phys polar positive proton R. J. W. Le Fèvre radical rate coefficients rate constants ratio reaction constant reactivity relative resorcinol ring sodium solution solvent steric steric effects structure studied substituent substituted substrate t-butyl Table temperature Tetrahedron thiophen trans triethylborane values