Heterofunctionalized phosphines derived from (2-formylphenyl)diphenylphosphine and their reactions with oxorhenium(V) complexes

Reactions of [ReOCl3(PPh3)(2)] with a potentially tridentate Schiff base derived from (2-formylphenyl)diphenylphosphine and 2-aminophenol, (HLP)-P-1, ((HLP)-P-1=Ph2PC6H4-2-HC=N(C6H4-2-OH) result in a rapid decomposition of the Schiff base and the formation of a large number of hitherto non-identified metal-containing species, while from similar reactions with the analogoue phosphine oxide (HLPO)-P-1. (HLPO)-P-1 = Ph2P(O)C6H4-2-HC=N(C6H4-2-OH)) products of the compositions [ReOCl2(PPh3)((LPO)-P-1)] (1) and [Re(NC6H4-2-OH)Cl-3(PPh3)(2)] (2) could be isolated. The structure of 2 is an experimental proof of the preceding, metal-induced cleavage of the C-N double bond. A subsequent reaction of the released 2-aminophenol forms the final phenylimido ligand. Reduction of (HLP)-P-1 with NaBH4 gives the phosphine amine (H2LP)-P-2(H2L2 = Ph2P(C6H4-2-CH2NH(C6H4-2-OH))) in good yield. Reactions of H(2)L(2)p Wit h common oxorhenium(V) complexes result in the formation of the stable rhenium(V) complex [ReOCl2((HLP)-P-2)] (3) with a facially coordinated HL2P ligand. (C) 2009 Elsevier Ltd. All rights reserved.