CH.OH CH.OH C=0 C=0 HO-C-H H-C一OH 影nantioners D-Fructose and L-fructose,an 且C-OH 10-C1 Mirror imge enantiomeric pair.Note that H一C-oH c0a5 gurations HO一C-H changing the configuration only at Cs would change D- CHOH CHOH fructose to L-sorbose D-Fractoae IPructoue Stereoisomers that are mirror images of each other are called enantiomers(对映体) )or sometimes enantiomeric pairs
Stereoisomers that are mirror images of each other are called enantiomers(对映体）, or sometimes enantiomeric pairs. D-Fructose and L-fructose, an enantiomeric pair. Note that changing the configuration only at C5 would change Dfructose to L-sorbose
Pairs of isomers that have opposite configurations at one or more of the chiral centers but that are not mirror images of each other are called diastereomers(非对映体)or diastereomeric pairs
Pairs of isomers that have opposite configurations at one or more of the chiral centers but that are not mirror images of each other are called diastereomers(非对映体） or diastereomeric pairs
Two sugars that differ in configuration at only one chiral center are described as epimers（差向异构体).For example,.D- mannose and D-talose are epimers and D- glucose and D-mannose are epimers, whereas D-glucose and D-talose are not epimers but merely diastereomers
Two sugars that differ in configuration at only one chiral center are described as epimers（差向异构体）. For example, Dmannose and D-talose are epimers and Dglucose and D-mannose are epimers, whereas D-glucose and D-talose are not epimers but merely diastereomers
1 CHO CHO CHO HO-2C-H H-2C-OH H26-0H HO-C-H Ho 3C-H HO-3C-H H-C-OH H-4C-OH HO-4C-H H5C-OH H5C-OH H-5C-OH 6CH2OH 6 CH,OH 6CH2OH D-Mannose D-Glucose D-Galactose (epimer at C-2) (epimer at C-4) D-glucose and two of its epimers are shown as projection formulas.Each epimer differs from D-glucose in the configuration at one chiral center (shaded red)
• D-glucose and two of its epimers are shown as projection formulas. Each epimer differs from D-glucose in the configuration at one chiral center (shaded red)
Optical rotation is to be specified in the name,the Fischer convention of D or L designations may be used along with a (plus)or-(minus)sign.Thus,D-glucose may also be called D(+)-glucose because it is dextrorotatory, whereas D-fructose,which is levorotatory, can also be named D(-)-fructose
Optical rotation is to be specified in the name, the Fischer convention of D or L designations may be used along with a + (plus) or - (minus) sign. Thus, D-glucose may also be called D(+)-glucose because it is dextrorotatory, whereas D-fructose, which is levorotatory, can also be named D(-)-fructose