Fischer Projection to Haworth/Chair Conformation

[ngu9997]

Can you tell if the ring will be beta or alpha in the haworth projection, chair conformation by just looking at the Fischer projection, or must you be told first before creating the two from the Fischer? If so, could someone explain how? I've seen a bunch of websites and they all seem to say that you won't be able to tell from a Fischer alone.

 

[Ygggdrasil]

In aqueous solution, glucose exists in both the open and closed forms. These two forms always exist in equilibrium. In the process of converting from closed to open form and then back to closed form, the C-1→ C-2 bond rotates. This rotation produces either of the two anomers. We term this phenomenon of opening of the ring, rotation of the C-1→ C-2 bond and the subsequent closing of the ring as mutarotation. So as a result of mutarotation, both the α and β anomers are present in equilibrium in solution. In the case of glucose, β anomer is more predominant than α anomer. This may not be the case with all the monosaccharides.

https://www.khanacademy.org/test-pr...d-ketones/a/cyclic-hemiacetals-and-hemiketals