Thermolysis of the P-coordinated KITPHOS monophosphine
complex
[(p-cymene)RuCl2(KITPHOS)] in chlorobenzene
at 120 °C resulted in displacement of the p-cymene
to afford [{κ(P)-η6-KITPHOS}RuCl2], the first example of a constrained-geometry complex in
which the κ(P)-bonded diphenylphosphino group and the η6-coordinated proximal phenyl ring are connected by an unsaturated
two-carbon tether; both complexes form efficient catalysts for the
direct ortho arylation of 2-phenylpyridine and N-phenylpyrazole
with a range of aryl chlorides.
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