Abstract

Analytically pure, dark blue pentaphenylborole (PPB) can be synthesized from 1,1-dibutyl-2,3,4,5-tetraphenylstannole and C 6H 5BCl 2 in toluene in 95% yield. Reduction of PPB with elemental potassium in THF produces brownish red K 2[PPB] which is derived from the new 6π-electron anion [PPB] 2−. The new complexes (C 5H 5)Co(PPB) and (COD)Pt(PPB) (COD = 1,5-cyclooctadiene) are obtained by irradiation of a toluene solution of (C 5H 5)Co(CO) 2 and PPB and by ligand substitution reaction from Pt(COD) 2 and PPB respectively.

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