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Reaction of hexamethyldisilazane with (2-hydroxyphenyl)diphenylphosphane 1 affords the trimethylsilyl derivative 2-(Me 3 SiO)-C 6 H 4 -PPh 2  (2). The Si-O-bond is cleaved by various phos­phorus halides, e.g. [Bu n  3 PF] +  Br - , PhPCl 2 , PCl 3 , Ph 2 PF 3  and PhPF 4  with formation of the cor­responding P-O-derivatives and trimethylfluoro- or trimethylchlorosilane, respectively. The  31 P{ 1 H} NMR spectra of the products are discussed. [2-(Bu n  3 PO)-C 6 H 4 -PPh 2 ] + Br -  (7) on reac­tion with nickel(II) bromide forms a paramagnetic complex of composition NiBr 2 L 2  (L = 7). A distorted tetrahedral coordination geometry at Ni may be derived from its magnetic moment, electronic spectra and conductivity data. The structure of the hydrobromide of 1 shows strong hydrogen bonding between the OH- and PH-group of the cation and the bromide anion (P-H 1,42 Å, H···Br 2,41 Å, angle P-H···Br 150°; O-H 1,00 Å, H···Br 2,09 Å, angle O-H···Br 176°).

zeitschrift für naturforschung b

Reaktionen des (2-TrimethylsiIoxyphenyl)diphenylphosphans mit Phosphorhalogeniden – Kristall- und Molekiilstruktur des (2-Hydroxyphenyl)diphenylphosphoniumbromids / Reactions of (2-Trimethylsiloxyphenyl)diphenylphosphane with Phosphorus Halides – Crystal and Molecular Structure of (2-Hydroxyphenyl)diphenylphosphonium Bromide