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Rossman, Mitchell Alan 2014-12-15T23:18:08Z 2014-12-15T23:18:08Z 10000-01-01 1983 1983 Cyamelurine, also known as tri-s-triazine or 1,3,4,6,7,9,9b-heptaazaphenalene, has been the subject of several theoretical investigations which have predicted its physical and chemical properties, color, fluorescence, and degree of chemical stability; however, the compound was hitherto unknown. Herein, we report the synthesis and the physical and chemical properties of cyamelurine. The abbreviated synthesis consisted of a two-step procedure whereby 2,4-diamino-1,3,5-triazine was treated with methyl N-cyanomethanimidate and sodium methoxide in dimethyl sulfoxide and methanol to give the intermediate 2,4-bis (N'-cyano-N-formamidino)-1,3,5-triazine, which was subjected to short vacuum pyrolysis to give cyamelurine. The compound gave no evidence of (a) formation of (pi) complexes with either electron-donor or electron-acceptor partners, (b) protonation, (c) alkylation, or (d) N-oxidation, yet it formed complexes with silver salts and decomposed in water. Photoelectron spectroscopic studies of cyamelurine in collaboration with Professor Pierre LeBreton at the University of Illinois at Chicago have provided ionization potentials associated with the six highest occupied (pi) and six highest occupied lone-pair orbitals. Interpretation of the photoelectron spectrum has been aided by results from semiempirical HAM/3, and from ab initio, Gaussian 70, quantum mechanical calculations. The detailed picture of valence orbital structure provides insight concerning the low basicity and the overall high chemical stability of cyamelurine, the ultimate member of the alternating-C,N azacycl{3.3.3}azine series. Next, we applied our methodology to the syntheses of the unsubstituted 1,3,4,6,7-pentaazacycl{3.3.3}azine (1,3,4,6,7,9b-hexaazaphenalene), 1,3,4,6-tetraazacycl{3.3.3}azine (1,3,4,6,9b-pentaazaphenalene) and examined and interpreted their photoelectron spectra, aided by results from semiempirical HAM/3 quantum mechanical calculation. Made available in DSpace on 2014-12-15T23:18:08Z (GMT). No. of bitstreams: 1 8410037.pdf: 3316521 bytes, checksum: 8552e6d322fc179bf348ae1ba7f942a7 (MD5) Previous issue date: 1983 Embargo set by: Seth Robbins for item 70415 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 138 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983. http://hdl.handle.net/2142/70249 (UMI)AAI8410037 Chemistry, Organic Synthesis, Chemical Behavior, and Spectroscopic and Theoretical Probes of Cyamelurine and Related Compounds text Chemistry Chemistry University of Illinois at Urbana-Champaign Dissertation Ph.D.