Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q6086309> ?p ?o }
Showing triples 1 to 41 of
41
with 100 triples per page.
- Q6086309 subject Q8824151.
- Q6086309 abstract "Isosaccharinic acid (ISA) is a six-carbon sugar acid which is formed by the action of calcium hydroxide on lactose and other carbohydrates. It is of interest because it may form in intermediate-level nuclear waste stores when cellulose is degraded by the calcium hydroxide in cements such as Portland cement. The calcium salt of the alpha form of ISA is very crystalline and quite insoluble in cold water, but in hot water it is soluble. ISA is thought to form by means of a series of reactions in which calcium ions acting as lewis acids catalyze two of the three steps. The first step is likely to be a rearrangement of the reducing sugar end of the cellulose (or lactose) into a keto sugar, the second step is likely to be a reaction similar to the base catylised dehydration which oftein occurs after an aldol reaction. In this second step an alkoxide (derived from a sugar) takes the role of the hydroxide leaving group, this second step is not likely to require the lewis acidity of the calcium. The final step is a benzilic acid rearrangement from a 1,2-diketone (1,5,6-trihydroxyhexane-2,3-dione) which is formed from the carbohydrate.Under acidic conditions sugars tend to form furans such as furfural and 5-hydroxymethylfurfural by a series of dehydrations of the carbohydrate.In acidic solutions the acid tends to form a 5-membered ring (lactone) by forming an ester between the carboxylic acid group and one of the alcohols. When treated with under anhydrous conditions with acetone, an acid and a dehydration agent two of the alcohol groups can be protected as a cyclic acetone acetal thus leaving behind only one alcohol,2 prolonged treatment with 2,2-dimethoxypropane forms a protected form of ISA where all four of the alcohol groups are protected as acetone acetals and the carboxylic acid is in the form of the methyl ester.3 These protected forms of ISA have been used as a starting material for chiral organic compounds anthracyclines.2".
- Q6086309 iupacName "(2S,4S)-2,4,5-Trihydroxy-2-(hydroxymethyl)pentanoic acid".
- Q6086309 thumbnail Isosaccharinic_acid.png?width=300.
- Q6086309 wikiPageExternalLink WR2006-06web.pdf.
- Q6086309 wikiPageWikiLink Q101487.
- Q6086309 wikiPageWikiLink Q11158.
- Q6086309 wikiPageWikiLink Q11358.
- Q6086309 wikiPageWikiLink Q12370.
- Q6086309 wikiPageWikiLink Q127900.
- Q6086309 wikiPageWikiLink Q134856.
- Q6086309 wikiPageWikiLink Q182849.
- Q6086309 wikiPageWikiLink Q185252.
- Q6086309 wikiPageWikiLink Q194290.
- Q6086309 wikiPageWikiLink Q199877.
- Q6086309 wikiPageWikiLink Q228106.
- Q6086309 wikiPageWikiLink Q243992.
- Q6086309 wikiPageWikiLink Q320141.
- Q6086309 wikiPageWikiLink Q412429.
- Q6086309 wikiPageWikiLink Q417589.
- Q6086309 wikiPageWikiLink Q420061.
- Q6086309 wikiPageWikiLink Q426296.
- Q6086309 wikiPageWikiLink Q45190.
- Q6086309 wikiPageWikiLink Q4596749.
- Q6086309 wikiPageWikiLink Q49546.
- Q6086309 wikiPageWikiLink Q59078.
- Q6086309 wikiPageWikiLink Q706.
- Q6086309 wikiPageWikiLink Q80294.
- Q6086309 wikiPageWikiLink Q818488.
- Q6086309 wikiPageWikiLink Q844123.
- Q6086309 wikiPageWikiLink Q8824151.
- Q6086309 wikiPageWikiLink Q900337.
- Q6086309 iupacname "-245".
- Q6086309 type ChemicalCompound.
- Q6086309 type ChemicalSubstance.
- Q6086309 type ChemicalObject.
- Q6086309 type Thing.
- Q6086309 type Q11173.
- Q6086309 comment "Isosaccharinic acid (ISA) is a six-carbon sugar acid which is formed by the action of calcium hydroxide on lactose and other carbohydrates. It is of interest because it may form in intermediate-level nuclear waste stores when cellulose is degraded by the calcium hydroxide in cements such as Portland cement. The calcium salt of the alpha form of ISA is very crystalline and quite insoluble in cold water, but in hot water it is soluble.".
- Q6086309 label "Isosaccharinic acid".
- Q6086309 depiction Isosaccharinic_acid.png.