exp035

=Objective= To purify crude phenylacetaldehyde by distillation.

=Procedure= Approximately 20ml of [|Phenyl acetaldehyde .] was taken in a 100ml round bottom flask and distilled at about 400 mm Hg.

=Results=

Characterization of 35A
[|HNMR], [|JCAMP Format HNMR] [|TLC]

=Discussion= Boiling point of phenylacetaldehyde expected at [|400 mm Hg would be 164 C] (based on the reported bp of 195C at 1 atm ), which is consistent with with observed distillation temperature at 167 C. However, the HMR of 35A showed many impurities, suggesting that distillation at a lower pressure be attempted. Also it may be necessary to discard a first fraction. When both of these steps are taken, phenylacetaldehyde is obtained pure.

=Conclusion= Phenylacetaldehyde could not be purified by distilling under house vacuum (400 mm Hg)

=Log=

2006-10-20
1. 12:12] Approximately 20ml of Phenylacetaldehyde was taken in a 100ml round bottom flask 2. 12:40] A distillation apparatus was assembled, a hose was connected to the in house vacuum terminal (approximate pressure 400 mm Hg) 3. Phenylacetaldehyde was heated using a thermowell until it started to distill. A stable Ubergang temperature (Tu) of 167 C was recorded. 4. 13:20] A drop in the Tu marked the end of distillation. 35A was obtained as a clear oil. =Tags= [|Phenylacetaldehyde], InChI=1/C8H8O/c9-7-6-8-4-2-1-3-5-8/h1-5,7H,6H2

media type="custom" key="7654"