Palladium salicylaldimine complexes containing boronate esters

[GRAPHICS] Reactions of salicylaldehydes with boronate ester derivatives of aniline have been examined. Addition of these Schiff base ligands to palladium acetate or Na(2)PdCl(4) afforded novel boron-containing trans-bis(N-arylsalicylaldiminato) palladium complexes. Condensation of salicylaldehyde (2-HOC(6)H(4)C(O) H) with H(2)NC(6)H(4)Bpin ( pin = 1,2- O(2)C(2)Me(4)) afforded the boron-containing Schi. bases, 2-HOC(6)H(4)C(H)=NC(6)H(4)Bpin (1 - 3a). Similar reactivity with 2-hydroxy-5-nitrobenzaldehyde and 2-hydroxy-1-naphthaldehyde gave the corresponding Schiff bases (1- 3b) and ( 1- 3c), respectively. Reaction of Schiff bases ( 2) and ( 3) with palladium acetate or Na(2)PdCl(4) afforded complexes of the type PdL(2) (4,5), where L = deprotonated Schiff base. The molecular structure of the nitro-salicylaldehyde 4-Bpin palladium complex (5b) was characterized by an X-ray diffraction study. All new palladium compounds have been characterized fully and tested for their antifungal activity against Aspergillus niger and Aspergillus flavus.