Date of Award


Document Type

Union College Only

Degree Name

Bachelor of Science






Aldehydes and ketones absorb weakly in the 290 mμ region of the ultraviolet spectrum, and also at 200 mμ (this wavelength region being analogous to that occurring in the spectra of olefinic compounds). This weak absorption band in the carbonyl absorption spectrum can be attributed to an n → π* transmission of a non-bonding electron on the oxygen atom to an anti-bonding π orbital in the multiple bond to give a singlet state. It is this absorption and consequent formation of an energized state which appears responsible for most of the photochemical transformation of saturated ketones in condensed (liquid) phases. After absorption, the energy may be disposed of by re-emission, by photochemical reactions such as dissociation, rearrangement and reaction with the medium, by intersystem crossing, or by internal conversion. Reactions will be run of all these reactants (benzophenone, cyclohexene and isopropanol) both with and without the presence of oxygen and of just cyclohexene and benzophenone both with and without the presence of oxygen.