in dichloromethane to benzene soln. decamethylstannocene added more acidic ligand (molar ratio 1:2), stirred for few days; recrystd. from CH3CN, elem. anal.;

in benzene to benzene soln. decamethylstannocene added more acidic ligand (molar ratio 1:1); recrystd. from CH2Cl2, elem. anal.;

potassium in tetrahydrofuran byproducts: pentamethylcyclopentadiene; a stoich. amt. of cut-up K was added under Ar to a soln. of stannocene in THF, mixt. was stirred at room temp. for 45 min; no initial stannocene was observed after the reaction; solvent was evapd., residue was extd. with petroleum ether, ext. was analyzed for remaining stannocene by (1)H NMR, insoluble material was treated with MeOH, elemental Sn was filtered and dried, soln. was examined for C5Me5H spectroscopically;