(g)Aldonic acids tend to exist as lactones. Ad-lactone has a six-membered ring.(h)Ag-lactone has a fve-membered ring.(i)Aldaric acids have carboxylic acid groups at both ends of the chain.25.19(a)Reduction of aldoses with sodium borohydride yields polyhydroxylic alcohols calledalditols.Optically inactive alditols are those that have a plane of symmetry, that is, those thatare meso forms. TheD-aldohexoses that yield optically inactive alditols areD-allose andD-galactose.HHHOHOHCHOHOHOHCH2OHCHOHHOHOHHOHHOHCH2OHCH2OHCH2OHHHOHOHHOHHOHNaBH4NaBH4d-AlloseAllitol(meso compound)Galactitol(meso compound)
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This note was uploaded on 10/03/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.