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Preparation of Unsymmetrical Diaryl Selenides via SNAr Reactions in η6-Chloroarene Transition Metal Complexes
journal contribution
posted on 1999-03-05, 00:00 authored by Andrei A. Vasil'ev, Lars Engman, J. Peter Storm, Carl-Magnus AnderssonUnsymmetrical diaryl selenides were prepared by nucleophilic displacement of chloride
with areneselenolates in η6-(arene) Cr(CO)3, FeCpPF6, and Mn(CO)3PF6 complexes. Areneselenolates were conveniently generated in situ by hydrazine reduction of the corresponding
diaryl diselenides and reacted with chloroarene Cr(CO)3 complexes in dimethyl sulfoxide at
70 °C. The reactivity of the cationic FeCpPF6 and Mn(CO)3PF6 chloroarene complexes was
substantially higher, affording substitution products at ambient temperature in ethanol with
areneselenolates generated by sodium borohydride reduction. Intermediate (arylseleno)arene
chromium and iron complexes were isolated and characterized by 77Se NMR. As compared
with the free diaryl selenide, complexation caused a 20−45 ppm downfield shift.
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Keywords
chloroarenesodium borohydride reductiondiaryl selenideUnsymmetrical Diaryl Selenides77 Se NMRsubstitution productsambient temperaturenucleophilic displacementcationic FeCpPF 6S N Ar Reactionsη 6Mndimethyl sulfoxideChloroarene Transition Metal Complexes Unsymmetrical diaryl selenidesareneselenolateiron complexesdiaryl diselenideshydrazine reductionCrFeCpPF 6
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