Matt, i am somewhat confused by your explination. Which -CH2OH group are
you talking about when determining the alpha/beta nomenclaturefor the
Fructosidic linkage? Because if you if you consider the -CH2OH group
attached to the #2 carbon (which was the carbonyl carbon) this does not
work, but if you consider the -CH2OH group attahced to the #5 carbon it
does work.
I guess my main question is do you always base the alpha/beta nomenclature
on the -CH2OH that is attached to the "attacking" end of the ring (in this
case the penultimate cabon)?
Thanks,
Justin
On Sun, 23 Nov 1997, Matthew R. Crouthamel wrote:
> Kristy,
> alpha-beta designations are not given because it's up or down, but because
> of it's position relative to the -CH2OH group. p 1054 tells us that an
> alpha anomer has it's -OH trans to the -CH2OH group, and the beta anomer has
> it's -OH group cis to the -CH2OH group. Now if you look at the sucrose
> molecule, this will make sense.
> MC
>
>