C5H5Na in diethyl ether to soln. of freshly sublimed BeCl2 was added dropwise soln. of NaC5H5 and stirred for 3 h; solvent was removed and residue cooled (ice bath); product was sublimedthree times;

in neat (no solvent) excess of BeCl2; purification by vacuum transfer;

in perdeuterocyclohexane equilibrium reaction; monitored by (1)H-NMR;

in neat (no solvent) Cp2Be was condensed into NMR tube on high vacuum line, then removed to N2 dry box for addition of BeCl2, to solids form viscous slush, after standing overnight LiSiMe3 was added, mixt. was heated; mixt. was condensed in dry C6D6; NMR;

1: pentane 2: benzene-d6 View Scheme