Basing your answers on the general mechanism for the first stage of acid-catalyzed acetal hydrolysis

suggest reasonable explanations for the following observations:
(a) Methyl α-D-fructofuranoside (compound A) undergoes acid-catalyzed hydrolysis some
105 times faster than methyl α-D-glucofuranoside (compound B).

(b) The β-methyl glucopyranoside of 2-deoxy-D-glucose (compound C) undergoes hydrolysis several thousand times faster than that of D-glucose (compound D).

Transcribed Image Text:

H fast slow HO, fast R COR R COR'R COR 潴; OCH он H CH Acetal Hemiacetal CH2OH он Н/OCH3 OH H H OH Compound A CompoundB HOCH2 CH OH но но но OCHs но OCHs но Compound C Compound D