Meson mass formula in broken SUN symmetry and its applications

Group theory of SU₅ and SU₆ symmetry is developed explicitly. Meson mass formula of Borchardt-Mathur-Okubo type is generalized to broken SU_N in a form suitable for computer calculation. The result is applied to SU₅ and SU₆ cases, by assuming two possible assignments: (1) 3.95 or upsilon 5.97 GeV is the new lowest state of J^PC = 1^?? member of SU₅ symmetry, and (2) 3.95 and 5.97 GeV states are new 1^?? members of SU₅ and SU₆, respectively. The derived wave functions and other consistency checks do not exclude above two possibilities in the sense of currently accepted Okubo-Zweig-Iizuka rule. A further check of the validity of the model in future experiments is suggested from a close examination of the group theoretical structures studied in this paper and available information.     

Trimethylbisdehydro[23]- and -[25]annulenones

Syntheses of trimethylbisdehydro [23]- and -[25]annulenones have been described, and the examination of their ¹H NMR spectra suggests the diatropicity and the paratropicity of the 25-membered and 25-membered rings, respectively.     

Synhtesis of 2-ethoxy-6,11-dimethyl-7,9-bisdehydroaza[16]annulene and 2-ethoxy-8,13-dimethyl-9,11-bisdehydroaza[18]annulene

Title azaannulenes, the paratropic and diatropic vinylogues of pyridine, were synthesized starting from the annulenones.