Ichiro Shimao

6-Amino-2,2′-bipyridine as a new fluorescent organic compound

6,6′-Diamino-2,2′-bipyridine (1a) has been found to exhibit a strong fluorescence in the near-UV region. Some amino and/or chloro substituted bipyridines (bpys) have been synthesized and studied to show that only 6-amino-substituted derivatives exhibited a strong emission. The emission of 6-amino-6′-chloro-bpy (3a) was the strongest (λmax= 429.0 nm; Φ= 0.78 in ethanol) among them. On the other hand, little or no emission was observed for monochloro-, dichloro- and 4-amino- derivatives.

Synthesis and properties of azuleno[2,1-a]-3-8-methano[ 10 ] annulene and its 2-methyl derivative

The cata-condensed system if azulene fused with 1,6-methano [ 10 ]annulenes was synthesized. The 1H NMR spectra revealed the existence of diastropicity as 18-pi electron periphery.

Catalytic activities of nickel (II) complexes of a salen analog, [Ni(babp)], in epoxidation of olefins

Abstract A salen analog [Ni(babp)] (babp = 6,6′-bis (benzoylaminato)-2,2′-bipyridine (2—)) and its t -butyl derivative catalysed epoxidation of olefins in the presence of sodium hypochlorite as the oxidant. These complexes showed higher catalytic activity than [Ni (salen)] in epoxidation of an electron-deficient olefin, allyl chloride, yielding epichlorohydrin in 43% yield.

The synthesis and properties of azuleno[1,2-d]bicyclo[5.4.1]dodeca-1,4,6,8,9a-pentaen-3-one and its cationic species

The titled azuleno-annulenone was synthesized and in strong acid its protonated cationic species was generated, which is the first 18-pi electron diatropic condensed bridged annulene as shown in its 1H-NMR spectrum.

Synthesis and properties of anti-6,15-epithia-8,13-methano-benzo[d][14]annulene-7,14-dione and its dicationic and dianionic species

Abstract The titled compound has been synthesized, and its 1 H and 13 C NMR spectra in D 2 SO 4 indicate that the cationic species formed by protonation has localized positive charges at carbonyl carbons due to the unfavorable conjugation because of the anti configuration between methylene and sulfur bridges.

Synthesis and properties of anti, anti-8,17-Epithia-1,6;10,15-bismethano[18]annulene-7,18-dione and its dicationic species

Abstract The titled quinone compound has been synthesized, and the X-ray crystallographic analysis of this compound revealed that it has anti-anti-configuration for stereochemical relationship between two methylene and sulfur bridges. Its 1 H and 13 C NMR spectra in D 2 SO 4 indicate that the cationic species formed by protonation has localized positive charges on the carbony carbons, mainly due to the unfavorable p-orbital overlap.