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Date: 7-12-2019
2007
Date: 20-7-2018
1720
Date: 3-12-2019
1591
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Reduction of sugars
Sodium borohydride reduction of an aldose makes the ends of the resulting alditol chain identical, HOCH2(CHOH)nCH2OH, thereby accomplishing the same configurational change produced by oxidation to an aldaric acid. Thus, allitol and galactitol from reduction of allose and galactose are achiral, and altrose and talose are reduced to the same chiral alditol. A summary of these redox reactions, and derivative nomenclature is given in the following table.
Derivatives of HOCH2(CHOH)nCHO |
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HOBr Oxidation |
——> |
HOCH2(CHOH)nCO2H |
HNO3 Oxidation |
——> |
H2OC(CHOH)nCO2H |
NaBH4 Reduction |
——> |
HOCH2(CHOH)nCH2OH |
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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العتبة العباسية تستعدّ لتكريم عددٍ من الطالبات المرتديات للعباءة الزينبية في جامعات كركوك
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