D and L aldohexose in ring structure

[chickensoupdr]

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I understand how to recognize D and L isomers in hawthorn diagrams, but how are they recognized in the ring structures?

 

[sdm33]

Right Down and Dirty
Right = D
In cyclic form Right = Down

 

[chickensoupdr]

carbon 2?

 

[sdm33]

Anamoric carbon in a cyclic form it bounds to two Oxygenes
In Fischer projection of glucose it is carbon number 5 that determines D it OH to the right and L if OH to the left.

 

[chickensoupdr]

thank youu!