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Since glucose is converted to fructose by this method, what can you say about the configuration of C_3,C_4 " and "C_5 in the sugars. |
Answer» Solution : Here aldohexosereacts with one MOLECULE of phenylhdrazine which condenses with the aldehyde group to give phenylhydrazone. When warmed with axcess of phenyl hydrazine, the SECONDARY alcoholic group adjacent to the aldehyde group is oxidised by another molecule of PHENYLHYDRAZINE, to a ketonic group. With this ketonic group, the third molecule of phenylhydrazine condenses to GIVEN osazone. The phenylhydrazinyl group is transferred from osazone to `C_6H_5CHO` giving `C_6H_5CH=N.NHC_6H_5` and a dicarbonyl compound called an osone. The more reactive aldehyde group of the osone is REDUCED, not the less reactive keto group and it give the 2-ketohexose. |
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