In article <FE03E646A2 at CIS.EPM.BR>, TAKAHASHI.BIOQ at EPM.BR says...
>Does anybody know how to prepare methyl- alpha and beta
>Helio K. Takahashi
>takahashi.bioq at epm.br
The classical method is by a modification of the method used for
preparation of the methyl glucopyranosides. Reacting a solution of the
free sugar in methanol in the cold with less than 1% HCl (dissolved by
bubbling HCl gas into the cold methanol) should give a mixture containing
mainly alpha and beta methyl glucofuranosides. For details, consult
Pigman & Horton, or try looking in Meth. in Carbohydr. Chem.