in toluene a mixt. in toluene was stirred at 70°C for 15 h (N2); evapd. under reduced pressure, acetonitrile was added, extd. with petroleum ether, acetonitrile was evapd.;

in neat (no solvent) heating for 3 h at 120-130°C; the mixt. was distd. in vac.; elem. anal.;

1: Mg / tetrahydrofuran 2: toluene View Scheme