Orgo Question

[osumc2014]

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For some reason i keep finding mixed answers for this. Does anomeric carbon of beta-D-Fructose point up or down? I think its up but in structure of sucrose, it points down and still is beta. Im confused.

 

[G1SG2]

For some reason i keep finding mixed answers for this. Does anomeric carbon of beta-D-Fructose point up or down? I think its up but in structure of sucrose, it points down and still is beta. Im confused.

The -OH group on the anomeric carbon of beta-D-Fructose points up. If it points up, its beta. If it points down, then its alpha.

 

[osumc2014]

The -OH group on the anomeric carbon of beta-D-Fructose points up. If it points up, its beta. If it points down, then its alpha.

Yea, I was just checking if it was different for furanoses or not cause they got that extra -CH2OH group at the anomeric carbon.