Question

Draw a stepwise mechanism for the following reaction.

Short answer

Answer

Step-by-step solution

Reactant

Reactants are starting material/substance/compound in the chemical reaction that takes part in the reaction which helps in the creation of the product.

It is always placed on the left side of the chemical reaction and reacts with the reagent to give products.

Formation of intermediate

When methyl-d-glucose is treated with benzaldehyde a compound is formed, then a base OH^- attack to the compound removal of water molecule takes place which on protonation an intermediate is formed as shown below.

Formation of intermediate

Formation of methyl-4-6-O-benzylidene-d-glucose 

A water molecule is removed from the intermediate again OH^- attack to the compound which forms methyl-4-6-O-benzylidene-d-glucose with${\mathrm{H}}_2\mathrm{O}$ as a byproduct.

Formation of methyl-4-6-O-benzylidene-d-glucose