triphenylphosphine in tetrahydrofuran byproducts: dibenzylideneacetone; excess PPh3; not isolated, detd. by (31)P-NMR spectroscopy;

in deuterated toluene Pd complex reacted with 4,6-dichloro-2-pyrone in toluene-d8 at 25°C; not isolated; monitored by (31)P NMR spectra;