in not given H2-atmosphere; stirring Rh-complex with 4 equiv. PPh3 and 0.5 equiv. of PPh2(NC4H4) (in C6D6 or PhMe, not specified); not isolated, detd. by (1)H-, (31)P-NMR spectroscopy;

triethylamine in tetrahydrofuran 6 h; Heating;