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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Selenium Compounds. LXII. Compounds of the Type C6H6SeX3 with X = OCHS, NO3, CH3CO2.Reaction of PhSeBr3 (Ph = C6H5) with NaOCH3 forms PhSe(OCH3) 3. Tho infrared spectrum indicates a distorted trigonal bipyramid with two OCH3 groups in axial positions, whereas one OCH3 group, the Ph group and the nonbonding electron pair occupy the equatorial ones. The 1H-NMR spectrum indicates fast exchange of the axial and equatorial positions down to -100°C. The compounds PhSe(ONO2) 3 and PhSe(OCOCH3) 3 are not detectable down to -60°C, Reaction of PhSeBr3 and AgX (X = NO3, CH3CO2) yields only the dissociation products PhSeO(ONO2) + N2O5 and PhSeO(OCOCH3) + (CH3CO2) O, resp. The groups NO3 and CH3CO2 are covalent bonded with the Se atom.
    Notes: PhSeO(OCH3) 3 (Ph = C6H6) entsteht aus PhSeBr3 und NaOCH3. Nach dem IR-Spektrum besitzt die Molekel eine verzerrte trigonal-bipyramidale Struktur, wobei zwei OCH3-Gruppen axial sowie eine OCH3-Gruppe, die Ph-Gruppe und das nicht-bindende Elektronenpaar des Selenatoms äquatorial angeordnet sind. Nach. Aussage des 1H-NME-Spektrums erfolgt auch bei -100°C rascher Austausch der axialen und äquatorialen Positionen. Aus PhSeBr3 und AgX (X = NO3, OH3CO2) entstehen auch bei -60°C nicht die Verbindungen PhSe(ONO2) 3 und PhSe(OCOCH3) 3, sondern deren Zersetzungs-produkte PhSeO(ONO) 2) + N2O5 sowie PhSeO(OCOCH3) + (CH3CO) 2O. Die Nitrat- und Acetatgruppe sind kovalent gebunden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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