The selective hydrogenation of vanillin to vanillyl alcohol can be carried out using a Ni-Cu catalyst. Vanillyl alcohol is a valuable intermediate in the synthesis of various flavors and fragrances. Here's a general procedure that you can follow:

Materials:

• Vanillin
• Ni-Cu catalyst
• Hydrogen gas
• Solvent (such as methanol)
• Stirring apparatus
• Pressure reactor

Procedure:

Notes:

• The hydrogen pressure and temperature used will depend on the catalyst used and the desired reaction rate.
• To improve selectivity towards vanillyl alcohol, you may want to add a base such as sodium carbonate to the reaction mixture.
• It's important to keep the reaction conditions controlled and consistent to obtain consistent yields of the desired product.

Ramin Javahershenas Thanks for your suggestions. We tried adding sodium carbonate to reaction mixture but still we didn't obtained vanillyl alcohol.

We are using Ni-Cu catalyst on graphene oxide. We will be grateful if you could be specific with quantity of sodium carbonate and optimum hydrogen pressure and temperature that needs to be maintained.