Conversion of Arabinose to Glucose and Mannose
Aldose to Next Higher Aldose(Arabinose to Glucose and Mannose)
Kiliani-Fischer Cyanohydrin Synthesis
Aldose is first reacts with HCN consequently an assymetric centre introduced in the aldose and forms two cyanohydrins. These cyanohydrins then hydrolysed with dilute acid to give corresponding aldonic acids. This acids on heating lose a molecule of water to give γ-lactones which is reduced by LAH or Na-Hg in weakly acidic solution to give aldoses which contains one more carbon atoms than the original aldose.D-Arabinose may be converted into to D-Glucose and D-Mannose by the following process-
