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Hexose
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===Ketohexoses=== A ketohexose is a [[ketone]]-containing hexose.<ref name=lind2007/><ref name=robyt1997/><ref name=orch1980>{{cite book | title = The vocabulary of organic chemistry | editor = Milton Orchin | publisher = Wiley | year = 1980 | isbn = 978-0-471-04491-8 | url-access = registration | url = https://archive.org/details/vocabularyoforga0000unse }}</ref> The important ketohexoses are the 2-ketohexoses, and the most important 2-ketose is [[fructose]]. Besides the 2-ketoses, there are only the 3-Ketoses, and they do not exist in nature, although at least one 3-ketohexose has been synthesized, with great difficulty. In the linear form, the 2-ketohexoses have three chiral centers and therefore eight possible stereoisomers (2<sup>3</sup>), comprising four pairs of enantiomers. The four {{sc|D}}-isomers are: <gallery> File:DPsicose Fischer.svg | <div align="center">{{sc|D}}-[[Psicose]]<ref name=pub-D-psicose>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/D-Psicose#section=Names-and-Identifiers|title={{sc|D}}-Psicose|last=Pubchem|website=pubchem.ncbi.nlm.nih.gov|language=en|access-date=2018-04-26}}</ref></div> File:D-Fructose.svg | <div align="center">{{sc|D}}-[[Fructose]]<ref name=pub-fructose>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/5984#section=Top|title=Fructose|last=Pubchem|website=pubchem.ncbi.nlm.nih.gov|language=en|access-date=2018-04-26}}</ref></div> File:DSorbose Fischer.svg | <div align="center">{{sc|D}}-[[Sorbose]]<ref name=pub-sorbose>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/107428#section=Top|title=Sorbose, {{sc|D}}-|last=Pubchem|website=pubchem.ncbi.nlm.nih.gov|language=en|access-date=2018-04-26}}</ref></div> File:DTagatose Fischer.svg | <div align="center">{{sc|D}}-[[Tagatose]]<ref name=pub-tagatose>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/92092#section=Top|title=Tagatose|last=Pubchem|website=pubchem.ncbi.nlm.nih.gov|language=en|access-date=2018-04-26}}</ref></div> </gallery> The corresponding {{sc|L}} forms have the hydroxyls on carbons 3, 4,and 5 reversed. Below are depiction of the eight isomers in an alternative style: <gallery> File:Psicose.png | <div align="center">{{sc|D}}-[[Psicose]]</div> File:D-fructose CASCC.png | <div align="center">{{sc|D}}-[[Fructose]]</div> File:D-sorbose.png | <div align="center">{{sc|D}}-[[Sorbose]]</div> File:Tagatose.png | <div align="center">{{sc|D}}-[[Tagatose]]</div> </gallery> <gallery> File:L-psicose.png | <div align="center">{{sc|L}}-[[Psicose]]</div> File:L-fructose.png | <div align="center">{{sc|L}}-[[Fructose]]</div> File:Sorbose.png | <div align="center">{{sc|L}}-[[Sorbose]]</div> File:L-tagatose.png | <div align="center">{{sc|L}}-[[Tagatose]]</div> </gallery>
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