Quarterly Journal of the Chemical Society of London, Volume 1, Pages 1-996 |
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Page 363
... acid content . Other polysac- charides which were present in the original preparation were not detected . Partial Acid Hydrolysis of Polysaccharide A. - Polysac- charide A ( 10 g . ) was heated in N - sulphuric acid ( 500 ml . ) on a ...
... acid content . Other polysac- charides which were present in the original preparation were not detected . Partial Acid Hydrolysis of Polysaccharide A. - Polysac- charide A ( 10 g . ) was heated in N - sulphuric acid ( 500 ml . ) on a ...
Page 491
... acid ( 66.7 g . ) . Concentration of the aqueous layer to 600 ml . gave more acid ( 26.2 g . ) , which was less readily purified . Repeated crystallisation of the acid from water until its i.r. spectrum no longer showed the bands at ...
... acid ( 66.7 g . ) . Concentration of the aqueous layer to 600 ml . gave more acid ( 26.2 g . ) , which was less readily purified . Repeated crystallisation of the acid from water until its i.r. spectrum no longer showed the bands at ...
Page 739
... acids of elemi resin is confused . The acids have been re- examined by modern techniques and shown to be 3 - oxotirucalla - 8,24 - dien - 21 - oic acid ( IV ) , the corresponding 3- and 33 - hydroxy - acids ( I and VI ) , and 3α ...
... acids of elemi resin is confused . The acids have been re- examined by modern techniques and shown to be 3 - oxotirucalla - 8,24 - dien - 21 - oic acid ( IV ) , the corresponding 3- and 33 - hydroxy - acids ( I and VI ) , and 3α ...
Contents
Organic chemistry | 1 |
oestrone | 10 |
Heterocyclic compounds from urea derivatives Part XVI Interaction of carbonohydrazide and carbodi | 19 |
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absorption acetic acid acetone added adduct alcohol alumina Amer aqueous aromatic band benzene boiled bromide Calc CH₂ chalcone Chem chim chloride chloroform chromatography cm.¹ colourless compound cooled crystallised cyclisation cyclohexane decomp derivatives diluted dimethyl dimethylformamide dioxan distilled doublet dried eluted ester ethanol ethyl acetate EtOH evaporated extracted with ether filtered filtrate Found fraction gave give heated under reflux hydrochloric acid hydrolysis i.r. spectrum identical irradiation isolated isomer ketone light petroleum b.p. lithium aluminium hydride mass spectra methylene mixed m.p. mixture mmoles mole n.m.r. spectrum needles nitrogen Nujol obtained olefin oxidation peak phosphine potassium prepared protons pyridine reaction reagent rearrangement reduced pressure reflux requires residue ring room temperature showed signals silica gel singlet sodium hydroxide solid solution solvent stirred structure synthesis Table tetrahydrofuran VIII yellow yield zygosporin