Application of 19132-06-0, As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world.Mentioned the application of 19132-06-0,(2S,3S)-Butane-2,3-diol.
Photochemical Reaction Mechanism of beta,gamma-Unsaturated Ketones. The 1,3-Acetyl Shift in Cyclopent-2-enyl Methyl Ketones
The topological course of photochemical 1,3-acetyl shift in (R)-(+)-cyclopent-2-enyl methyl ketones and the kinetics of the processes deactivating the fluorescent S1(n,?*) state have been studied.The reaction is shown to proceed in a predominantly suprafacial manner to form the rearranged (S)-(-)-isomer.Independent of the temperature in the range of -45 to 50 deg C, an upper limit of only about 20percent of the reaction occurs with racemization.These results, in conjunction with those of a previous CIDNP study, are explained by a mechanism in which the 1,3-acetyl shift proceeds at least in part via a radical pair by alpha-cleavage from the S1(n,?*) and T2(n,?*) excited states.The dominating reaction throughout the temperature range studied is, however, from S1, either concerted or via the radical pair, even though the proportion of the T2 radical cleavage increases with decreasing temperature.A combination of fluorescence lifetime and reaction quantum yield studies as a function of temperature and solvent polarity disclosed two thermal activation barriers deactivating S1(n,?*), the larger one of which is shown to be associated with the 1,3 shift.The results of semiempirical calculations of the electronic structures of the excited states of 1,2-dimethylcyclopent-2-enyl methyl ketone at or very near to the equilibrium geometry were in full accord with the stereochemistry- and multiplicity-dependent mechanistic scheme.
Application of 19132-06-0, Interested yet? Read on for other articles about Application of 19132-06-0!
Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate