Could you please give a stepwise mechanism for the preparation of 3-nitrochalcone from 3-nitrobenzaldehyde and acetophenone. (This is an aldol condensation reaction)© BrainMass Inc. brainmass.com October 24, 2018, 8:42 pm ad1c9bdddf
This solution provides a detailed mechanism for an aldol condensation reaction.
Organic Chemistry: Aldol Condensation and Reduction of Carbonyl
See the attachments.
ALDOL CONDENSATION: PREPARATION OF TRANS-p-ANISALACETOPHENONE
(Post Lab Questions: pp. 622-623, Problems 2, 5, 10)
2. Explain why the main reaction between acetophenone and p-anisaldehyde is the mixed-aldol reaction rather than (a) self-condensation of acetophenone or (b) the Cannizzaro reaction of p-anisaldehyde.
5. Propose a synthesis of cinnamaldehyde using a mixed-aldol condensation reaction.
10. Consider the spectral data for acetophenone.
a. In the functional group region of the IR spectrum, specify the absorptions associated with the carbonyl group and the aromatic ring.
b. In the 1H NMR spectrum, assign the various resonances to the hydrogen nuclei responsible for them.
c. For the 13C NMR data, assign the various resonances to the carbon nuclei responsible for them.
REDUCTION OF CARBONYL COMPOUNDS: PREPARATION OF FLUORENOL (Preparative)
(Post Lab Questions: pp. 584-585, Problems 2, 3, 6, 11)
2. After the reaction between sodium borohydride and the ketone is complete, the reaction mixture is treated with water and acid to produce the desired secondary alcohol. Explain this reaction by indicating the source of the hydrogen atom that ends up on the oxygen atom.
3. Sodium borohydride is fairly unreactive toward methanol, but adding a mineral acid to this solution results in the rapid destruction of the sodium borohydride. Explain.
6. Suggest a structure for the white precipitate formed in the reaction of 9-fluorenone with sodium borohydride.
11. A nitro group, a carbon-carbon double bond, a carbon-nitrogen double bond, and an aromatic ring may each be reduced under certain conditions. Rank these functional groups in order of increasing reactivity.