Alpha and Beta from Fischer Projection

Started by fhussain9
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fhussain9

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I understand why C is a D structure but can someone explain how to get Alpha and Beta from a fischer projection?
 

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alpha refers to 1 carbon away from COO- and beta refers to 2 carbons away from COO-.

If you orient the fischer projections properly so that COO- is the top most carbon, (C) gives the D isomer.
 
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