Mannose Fischer projection

Once the eight Fischer projections have been written they are named m order with the aid of the sentence All altruists gladly make gum m gallon tanks The words of the sentence stand for allose altrose glucose mannose gulose idose galactose talose... 

The aldohexoses are allose, altrose, glucose, mannose, gulose, idose, galactose, and talose. The mnemonic All altruists gladly make gum in gallon tanks is helpful in writing the conect Fischer projection for each one. 

Because both (+)-glucose and (+)-mannose yield optically active aldaric acids and both have the same configuration at C-4, the hydroxyl group must lie at the right in the Fischer projection at this carbon. 

This is the last piece in the puzzle, the one that permits one of the Fischer projections shown in the first part of step 3 to be assigned to (-l-)-glucose and the other to (-l-)-mannose. Consider first the structure... 

This is the same aldaric acid as that provided by one of the structures given as either (+)-glucose or (+)-mannose. That Fischer projection therefore corresponds to (+)-glucose. 

Using Fischer projections, draw the product of the reaction of D-mannose with... 

Draw Fischer projections for these monosaccharides a) L-Glyceraldehyde h) L-Mannose... 

Draw the Haworth projection for the cyclic structure of D-mannose by laying down the Fischer projection. 

PROBLEM 16.1 Using Figure 16.1, write the Fischer projection formula for a. L-arabinose b. i.-mannose... 

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