From the spectral data it may be assumed that di-p-chlorodibenzalacetone exists in solution as a mixture of s-cis,s-cis- and s-cis, s-trans-conformations, possessing a trans-configuration of both ethylenic bonds, which does not contradict the data of the dipole moments....
Using these methods, metastable C 10H 9O + derived from the molecular ions of substituted benzalacetones 1 are shown to correspond to 2-methyl-benzopyrylium ions 3. This confirms that the loss of a hydrogen atom or a substituent from the phenyl group of the molecular ions of 1 occurs by...