Unformatted text preview: he carbonyl group is protonated by acid. Step 2) Nucleophilic attack by methanol and proton‐transfer forms the hemi‐acetal. RECITATION WORKSHEET 6 Step 3) The hydroxyl group of the acetal is protonated. Step 4) A water molecule is eliminated. Step 5) Nucleophilic attack by methanol and proton‐transfer forms the product, an acetal. 4. Draw Haworth and chair conformations for α‐D‐galactopyranose and β‐D‐galactopyranose. Label the anomeric carbon in each isomer. D‐galactose CH2 OH
OH B‐D‐galactose HOH2 C OH HO OH OH B‐D‐galactose O...
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- Spring '08
- pH, nucleophilic attack, Recitation Worksheet