[billsauce]

http://s74.beta.photobucket.com/user/teysure/media/sugar.jpg.html?sort=3&o=0


Is it d-idose or d-altrose? Im not sure about carbon #4. does it point up or down? in the picture is the l-structure. I think it is d-idose because when changing the L structure to the D structure in a fisher projection you switch everything.

[Dan]

Is it d-idose or d-altrose? Im not sure about carbon #4. does it point up or down? in the picture is the l-structure. I think it is d-idose because when changing the L structure to the D structure in a fisher projection you switch everything.

It is none of those.

Try again - it might be easier to convert the structure to the linear form - it makes the sugar easier to recognise.

[AWK]

D-Idose or D-glucose - search google images

[Dan]

D-Idose or D-glucose - search google images

Nope, neither of those. We are getting closer though I suppose.

[AWK]

This was only my hint for comparison - google images show also Haworth projections of furanoses.

[billsauce]

d-galactose i figured it out. so why C4 pointing down? is the fisher projection showing C5 and C6 or is C5 bonded to the O on the furanose?