REACTIONS OF PD(II) WITH CLOSE-1,2-DICARBADODECABORANE-1,2-DIPHOSPHINES

The reactivity of carboranyldiphosphines towards palladium (II) comple xes and the modifications that take place on the cluster an studied in this work. The reaction of aryl, alkyl or alkoxy substituted closo-ca rboranyldiphosphines with palladium (II) complexes [PdCl2L2] (L = PPh3 , PMePh2, PhCN) in ethanol, yields products in which partial degradati on of the carborane cage has taken place and total or partial substitu tion of the chlorine atoms of the initial palladium (II) complex has b een observed. The final stoichiometry depends on the steric characteri stics of the ligand, their basicity and the starting Pd(II) complex. T he crystal structure of (mu-Cl)(2){7,8-(P'Pr-2)(2)-7,8-C(2)Bq(9)H(10)} (2)] the third structurally characterized example of a bis chloride br idged palladium complex with phosphines has been determined. (C) 1998 Elsevier Science S.A. All rights reserved.