Aus 4‐Pyronen und N‐Acylaminosäuren bzw. 2‐Phenyloxazolon‐(5) entstehen 4‐Pyranyliden‐oxazolone‐(5), die mit Alkoholen, primären und sekundären Aminen zu Pyranyliden‐aminosäurederivaten oder Pyridinylidenoxazolonen reagieren können.
An esr investigation on group IVb organometalloxy- and organometalthio-pyryl and thiapyryl radicals
作者:Angelo Alberti、Francesco Paolo Colonna、Gian Franco Pedulli
DOI:10.1016/0040-4020(80)88030-6
日期:1980.1
triphenylgermyl and triphenylstannyl radicals with γ-pyrone, γ-thiopyrone, thia-γ-pyrone and thia-γ-thiopyrone have been studied by ESR spectroscopy. The spectral parameters indicate that these radicals adopt the conformation where the O-M or S-M bonds are eclipsed with the 2 pz orbital of the γ-carbon, despite the absence of hindering substituent groups in proximity of the radical centre.
通过ESR光谱研究了三苯基甲硅烷基,三苯基锗基和三苯基锡烷基与γ-吡喃酮,γ-硫代吡喃酮,硫代-γ-吡喃酮和硫代-γ-硫代吡喃酮的自旋加合物。光谱参数表明,尽管自由基中心附近不存在阻碍取代基的基团,但这些自由基采用的构型是OM或SM键被γ-碳的2 p z轨道所遮盖。
Cephalosporin compounds
申请人:Pfizer Inc.
公开号:US05504076A1
公开(公告)日:1996-04-02
7.beta.- 2-(aminothiazolyl and thiadiazolyl)-2-oxyiminoacetamido!cephalosporin derivatives having a 3- N-(optionally substituted) aminopyridiniumthiomethyl! substituent have antibacterial activity and are of use in antibacterial therapy. Processes for the preparation of such cephalosporins plus intermediates for use in the preparation thereof, including N-(optionally substituted)amino-thiopyridones, are also described.
Electron transporting compounds, electrophotographic layers and elements comprising such compounds
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0157492A2
公开(公告)日:1985-10-09
An electrophotographic layer comprising an electrically insulating binder and an electron donar additionally comprises, as an electron transporting compound, a 4H-thiopyran-1,1-dioxide having an electron-withdrawing group in the 4-position and a half-wave reduction potential more positive than -0.5 volt as measured against a saturated calomel electrode. Novel compounds useful as the electron transporting compound are provided.