CHEM3B - Aldol

CHEM3B - Aldol - Shayna Russell 18710646 April 6 2009 Param...

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Shayna Russell 18710646 April 6, 2009 Param Dillion – 312 The Crossed-Aldol Condensation Given the starting material, aldehyde Z, and NMR information of all the given products certain steps were followed in order to identify molecule Z. Based on the predicted identifications of the unknowns’ NMR analysis and observations in lab, it was clear that aldehyde Z is benzaldehyde. The smallest of all the products, it was easy to predict that assessment with NMR. The lack of any other oxygen beside that of the carbonyl group and shortness of the R-group acetone chain made it stand out. H’s near oxygens are very deshielded; the NMR of the product of Z showed relatively similar ppm’s for all the hydrogens. After completing the lab, obtaining 104-108 o C as the final melting point of the recrystallized solution, the argument made had even more conviction because it matched up nicely with the official melting point of dibenzylacetone, the product of starting material Z. The geometry of the alkene generated, dibenzylacetone,
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CHEM3B - Aldol - Shayna Russell 18710646 April 6 2009 Param...

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