Triphenylantimony dichloride, triphenylbismuth dichloride and lapachol (1) were obtained from Aldrich. Triethylamine was obtained from Sigma. All chemicals used were of reagent grade. The infrared (IR) spectra have been recorded on Perkin Elmer FTIR spectrum GX spectrometer using KBr pellets. Conductivity data were obtained with a Digimed DM31 apparatus equipped with a conductivity cell (C = 1.185 cm−1). Elemental analyses were carried out using a Perkin-Elmer 240
Elemental Analyzer. Atomic absorption analyses of bismuth and antimony contents were carried out on a model 8200 Hitachi atomic absorption spectrophotometer. 1H- and 13C-NMR were recorded at room temperature using a Bruker DRX400-AVANCE spectrometer, in the solvents indicated, with TMS as internal standard. Chemical shifts (δ) are given in ppm and coupling constants (J) in Hertz.