ZUR DARSTELLUNG VON BENZODITHIET-DERIVATEN DURCH THERMOLYSE 1,2-DITHIO-SUBSTITUIERTER BENZOLE
- 1 February 1988
- journal article
- research article
- Published by Taylor & Francis in Phosphorus and Sulfur and the Related Elements
- Vol. 35 (3-4) , 291-307
- https://doi.org/10.1080/03086648808074333
Abstract
The thermal fragmentation of various 1,2-dithio-benzene derivatives R4C6S2(X) with R = H, CH3, F in order to split off favorable leaving molecules × = Cl2, CO or H2C[dbnd]CH2 and to generate the corresponding benzene-1,2-dithiete products (R4C6S2), is investigated in a gas-flow reactor using real-time PE spectroscopic analysis. Results observed are: 1,2-bis(chloromercapto) benzene H4C6(SCl)2 yields 1,2-benzodithiete H4C6S2; none of the tetramethylated precursors fragments to the elusive tetramethyl derivative (H3C)4C6S2, but decarbonylation of tetrafluoro 1,2-benzodithio-2-on F4C6S2(CO) leads to rather reactive tetrafluoro 1,2-benzodithiete F4C6S2. Characteristic ionisation patterns are assigned by radical cation state comparison and by Koopmans' correlations based on MNDO eigenvalues. Die thermische Fragmentierung verschiedenartiger 1,2-Dithiobenzol-Derivative R4C6S2(X) mit R = H, CH3, F, die unter Abspaltung günstiger Abgangsmoleküle × = Cl2, CO oder H2C[dbnd]CH2 die entsprechenden Benzo-1,2-dithiet-Produkte (R4C6S2) liefern konnte, wird in einem Gasdurchfluβ-Reaktor mit PE-spektroskopischer Echtzeit-Analytik untersucht. Beobachtet wird: 1,2-Bis(chloro-mercapto)benzol H4C6(SCl)2 liefert 1,2-Benzodithiet; keine der tetramethylierten Ausgangsverbin-dungen fragmentiert zum vermutlich instabilen Tetramethyl-Derivat (H3C)4C6S2, aber Decar-bonylierung von Tetrafluor-1,2-benzodithio-2-co F4C6S2(CO) führt zum reaktiven Tetrafluor-1,2-benzodithiet. Die charakteristischen lonisienmgsmuster werden durch Radikalkationenzustands-Vergleiche sowie durch Koopmans'-Korrelation mit MNDO-Eigenwerten zugeordnet.Keywords
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