Melting Point Lab Report Results
The experimental melting point range of the desired alkene product, trans-9-(2-phenylethenyl) anthracene, was found to be 132-134 ˚C, in comparison to the literature value melting point range of 130-132˚C,1 it was slightly higher than expected. Overall, the experimental melting point range varied from the initial melting point temperature and maximum melting point temperature by 2˚C. As the experimental melting point had a small range of temperature variance and was above that of the literature value, it can be deduced that the final alkene product was successfully synthesized and purified in the experiment.
Progress in creating the alkene product throughout the reaction was tested via TLC analysis and Rf of the product was found to be 0. …show more content…
However, the Rf data and melting point indicate the final synthesized alkene product could be identified as a pure sample. In the chance of an impure product contaminated by the starting benzaldehyde, of the product could have been lower, however the experimental melting point was not lower than expected, which would have been the case had unreacted benzaldehyde remained in the product, it is likely that product was lost due to experimental error on the part of the students when purifying the synthesized product. It is also possible that product was lost then only one large organic layer was not recovered, and a second washing of the aqueous layer to form a second organic layer could not be performed due to product contamination with undesired …show more content…
Had the spectral data been correct, a small triplet would have been observed near 7.30ppm, representing the lone hydrogen (1H) located on the topmost carbon of the aromatic ring shown at the top of the molecule. This shift value falls in line with standard aromatic proton shift values between 6.0-9.2ppm. The third, fourth and fifth proton environments were represented by the same crowded an unclean multiplet between 1.15-1.86ppm. Had the spectral data been correct, a broad multiplet representing these 2 aromatic protons from the top aromatic ring and 4 from the lower aromatic system from the central pi bond would have been observed beteen 7.44-7.49ppm, which falls in the standard range for aromatic
Progress in creating the alkene product throughout the reaction was tested via TLC analysis and Rf of the product was found to be 0. …show more content…
However, the Rf data and melting point indicate the final synthesized alkene product could be identified as a pure sample. In the chance of an impure product contaminated by the starting benzaldehyde, of the product could have been lower, however the experimental melting point was not lower than expected, which would have been the case had unreacted benzaldehyde remained in the product, it is likely that product was lost due to experimental error on the part of the students when purifying the synthesized product. It is also possible that product was lost then only one large organic layer was not recovered, and a second washing of the aqueous layer to form a second organic layer could not be performed due to product contamination with undesired …show more content…
Had the spectral data been correct, a small triplet would have been observed near 7.30ppm, representing the lone hydrogen (1H) located on the topmost carbon of the aromatic ring shown at the top of the molecule. This shift value falls in line with standard aromatic proton shift values between 6.0-9.2ppm. The third, fourth and fifth proton environments were represented by the same crowded an unclean multiplet between 1.15-1.86ppm. Had the spectral data been correct, a broad multiplet representing these 2 aromatic protons from the top aromatic ring and 4 from the lower aromatic system from the central pi bond would have been observed beteen 7.44-7.49ppm, which falls in the standard range for aromatic