Journal of the Chemical Society, Part 1The Society., 1962 "Titles of chemical papers in British and foreign journals" included in Quarterly journal, v. 1-12. |
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Page 1209
... acid with hot formic acid . Since the L - guluronic acid residues might have arisen by epimerisation at C ( 5 ) of some of the D - mannuronic acid units during the alkaline extraction of the alginic acid from L. digitata , D ...
... acid with hot formic acid . Since the L - guluronic acid residues might have arisen by epimerisation at C ( 5 ) of some of the D - mannuronic acid units during the alkaline extraction of the alginic acid from L. digitata , D ...
Page 1402
... acid ( III ) racemised at room temperature during 2 days or at the boiling point in 2 min . The ( + ) - acid ( IV ) had [ x ] 5791 + 33 · 4 ° and [ x ] 5461 + 40.5 ° in chloroform . Its racemis- ation in toluene was studied at various ...
... acid ( III ) racemised at room temperature during 2 days or at the boiling point in 2 min . The ( + ) - acid ( IV ) had [ x ] 5791 + 33 · 4 ° and [ x ] 5461 + 40.5 ° in chloroform . Its racemis- ation in toluene was studied at various ...
Page 1449
... acid ( 4 · 56 g . ) and phenoxyacetic acid ( 3 · 04 g . ) in dry benzene ( 25 ml . ) . The dark red mixture was refluxed for a further 20 min . and then cooled , whereupon a dark gum separated . Trituration of the mixture with 5N ...
... acid ( 4 · 56 g . ) and phenoxyacetic acid ( 3 · 04 g . ) in dry benzene ( 25 ml . ) . The dark red mixture was refluxed for a further 20 min . and then cooled , whereupon a dark gum separated . Trituration of the mixture with 5N ...
Contents
NO PAGE | 1 |
NOTES | 62 |
The use of triethylamine in the preparation of NcarboxyLproline anhydride | 68 |
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absorption acetic acid acetone added afforded alcohol alkali Amax Amer amylose anhydride aqueous solution atom benzene bromide buffer Calc carbon carbonyl CH₂ Chem chloride chloroform chromatography coefficients colourless complexes compound concentration constant containing crystallisation crystals decomposition derivative dilute distilled double bond dried eluted ester ethanol ethyl acetate evaporated experimental filtrate formation formed Found fraction gave give H₂O heated hydrazine hydrochloric acid hydrogen hydrolysis hydroxyl infrared infrared spectrum intermediate isolated isomerisation k₁ ketal ketone light petroleum b. p. m. p. and mixed malononitrile methyl mixed m. p. mixture mole molecule needles nitrogen nucleophilic obtained oxidation phenyl polymer potassium potassium hydroxide precipitate prepared present ratio reaction reagent reduction reflux requires residue room temperature sample sodium ethoxide sodium hydroxide solid solvent spectra structure Table terpyridine triethylamine ultraviolet values washed yellow yield