The structure for α -D-Galactose 6-phosphate has to be drawn. Concept introduction: The reaction of hydroxyl groups of a monosaccharide with inorganic oxyacids results in the formation of inorganic esters. Phosphoric acid gives phosphate esters. Phosphate esters are commonly found in biological systems. The esterification of hemiacetal group on carbon 1 and the primary alcohol on carbon 6 gives phosphate esters.

Question

Consider the reaction below to answer the following questions: Acetoacetic ester can be prepared by the Claisen self-condensation reaction of ethyl acetate. 1. NaOEt, EtOH H&C OCH CH3 2 H30 H3C CH2 OCH2CH3 A. Write the complete stepwise mechanism for this reaction. Show all electron flow with arrows and draw all intermediate structures. B. Ethyl acetate can be prepared from ethanol as the only organic starting material. Show all reagents and structures for all intermediates in this preparation. C. Give the structures of the ester precursors for the following Claisen condensation product and formulate the reaction. OEt

Answer 1

Question

Chapter 18, Problem 18.112EP

(a)

Interpretation Introduction

Interpretation: The structure for α-D-Galactose 6-phosphate has to be drawn.

Concept introduction: The reaction of hydroxyl groups of a monosaccharide with inorganic oxyacids results in the formation of inorganic esters. Phosphoric acid gives phosphate esters. Phosphate esters are commonly found in biological systems. The esterification of hemiacetal group on carbon 1 and the primary alcohol on carbon 6 gives phosphate esters.

(b)

Interpretation Introduction

Interpretation: The structure for β-D-Galactose 1-phosphate has to be drawn.

Concept introduction: The reaction of hydroxyl groups of a monosaccharide with inorganic oxyacids results in the formation of inorganic esters. Phosphoric acid gives phosphate esters. Phosphate esters are commonly found in biological systems. The esterification of hemiacetal group on carbon 1 and the primary alcohol on carbon 6 gives phosphate esters.

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