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1.) From the 1H NMR spectrum of dibenzalacetone can you deduce what stereoisomer(s) of dibenzalacetone is (are) formed? The chemical shift of the alkene protons is downfield from the expected resonance. What is the shift due to?
2.) how owuld you change the procedures in this experiment if you wished to synthesize benzalacetone C6H5CH=CHCOCH3?
3.) Assign the peak in the IR spectrum of the product that is at 1639 cm-1. Is this the normal absorption for this functional group? In benzaldehyde there is an absorption at 2738 cm-1 but it is absent in the IR of dibenzalacetone. Why?
4.) In the 13C NMR of dibenzalacetone, there are seven signals at 188.8, 143.2, 134.8, 130.4, 128.9, 128.4, and 125.4 ppm. This indicates that there are equivalent carbon environments in the molecule. Draw the molecule with the correct steriochemistry and using numbers, indicate which carbons are in equivalent environments.
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