Irradiation of dissociating cyclopentadienone-dimers (2 b, c, e) results in formation of two types of cage-products (5 and 8) in very low quantum yields and good, but wavelength and phase dependent chemical yields. Both processes are intramolecular, for 2b this was shown using isotopic labeling and massspectrometric techniques. Sensitization and quenching experiments indicate that triplet states are
Steric effects in the dimerization of 2,5-dialkyl-3,4-diphenylcyclopentadienones
作者:Hilton M. Weiss
DOI:10.1039/p29910000439
日期:——
Some novel methyl- and ethyl-substituted dimers of 2,4-diphenylcyclopentadienones have been detected. Their enthalpies of dimerization have been determined and compared with values calculated by molecular mechanics. The steric demands of this dimerization have thus been clarified.