
4. Draw the mechanism for the reduction of vanillin to vanillyl alcohol. NaBHA NaOH + HBO...
provide the reaction mechanism for this reaction scheme
OH NaBH4 HO o 5% NaOH, 0 °C Vanillin Vanillyl Alcohol
reaction mechanism for this reaction scheme
the
reaction was performed with HCl
OH NaBHA HO 0 5% NaOH, 0 °C Vanillin Vanillyl Alcohol
0.015mol vanillin in ethanol Normally vanillyl alcohol is recovered using filtration. Is it possible for the vanillyl alcohol product from borohydride reduction of vanillin to be captured through extraction and how would it be done?
Suppose you obtained the 1H NMR spectra of vanillin and vanillyl alcohol. Identify a single chemical shift (and give the approximate value in ppm) that would allow you to determine if you were successful in reducing vanillin to vanillyl alcohol.
After the addition of aqueous acid, the product, vanillyl alcohol, precipitates out of the solution. Draw the structure of vanillyl alcohol. Explain why the alcohol is much less soluble in aqueous acid than the salt of vanillin.
1. Write a mechanism for the reduction of vanillin using
sodium borohydride. 2. Compare and contrast sodium borohydride with
another reducing agent, lithium borohydride.
OH 1. NaBHa, EtOH 2. H3O OCH3 IOCH OH OCH3 OH
The questions in the first picture are related to the
Synthesis of Vanillyl Alcohol from Vanillin (Organic Chem
lab)!
The questions in the second picture are related to the
Grignard Reaction: Synthesis of Carboxylic acids!
Vanillin and vanillyl alcohol exhibit different Rf values. Explain this statement in terms of the affinity of the salic for the different functional groups.
Write a chemical equation to show (a) the main reaction in this experiment, (b) why Vanillin is more soluble in aq. NaOH than plain water, (c) why adding aq. HCI precipitates the product. (d) What would happen if we tried to carry out the reduction in aq. HCl instead of aq. NaOH? 1. 2. How many moles of hydride can be transferred from each mole of NaBHa? 3. Of the reagents used today, which one is both corrosive and flammable?...
Please show mechanism of product a (vanillyl acetate) the base
catalyzed product and product b ( 4-acetyloxy-3-methoxyphenyl
methanediyl diacetate) the acid catalyzed product.
Result A NaOH HOD 8H + H₂C-8-0-8-cris H2CO Vanillin H2SO4 Result B