sodium cyanoborohydride in tetrahydrofuran byproducts: bis(p-tolyl)silane; under N2; a THF soln. of Mn-complex was added to a suspn. of NaBH3CN in THF at -43°C, mixt. was stirred for 1d at room temp.; evapd. in vacuo, residue was extd. with hexane, filtered through a Celite pad, evapd., flash chromy. (SiO2, toluene/hexane (1/5));