acetone in benzene-d6 2 mol equiv. acetone and 2 mol equiv. C2H4 condensed into NMR tube contg. 1 mol equiv. soln. W-complex/C6D6 at -196°C, tube sealed; not isolated, detected by NMR-spect.; other uncharacterized products also present;

in benzene-d6 react. W-complex with 6-hepten-2-one at 25°C;