PHOTODEUTERUNG VON BENZALDEHYD UND SUBSTITUIERTEN BENZALDEHYDEN

Article abstract of DOI:10.1016/S0040-4020(01)96882-6

In the presence of deuterium oxide benzaldehyde (1a) and substituted benzaldehydes likewise possessing lowest triplet states of (n,?^*) character yield formyl-deuteriated benzaldehydes by fast and efficient photoreactions.Quantum yields of formation of 7-deuterio benzaldehyde (1b) in solvent acetonitrile-deuterium oxide 3:1 are 0.57 at 313 nm, 0.54 at 334 nm, 0.62 at 365 nm, and in acetone-deuterium oxide 3:1 0.87 at 313 nm, 0.83 at 334 nm and 0.91 at 365 nm.By products, mainly meso- and dl-dihydrobenzoin and benzoin, are formed to a small extent only.On the basis of CIDNP measurements the mechanism of photodeuteriation is discussed.