ZINC PYRAZOLYLBORATE COMPLEXES WITH PHENOXIDE AND ALKOXIDE LIGANDS

The zinc hydroxide complexes Tp()Zn-OH of highly substituted pyrazoly lborate ligands react with phenols. and alcohols, of sufficient acidit y, in a condensation reaction with release of H2O. Starting with pheno ls the following were attached: phenolate, p-nitrophenolate, o-vanilli nate, o-hydroxy- methylphenolate, o, o-bis(hydroxymethyl)-p-methylphen olate. Whilst aliphatic alcohols and benzyl alcohol did not react, the ir derivatives, with highly electronegative substituents, could be inc orporated. Thus, the arylmethoxides OCH2C6F5 and OCH2C6H4NO2-p, as wel l as the alkoxides OCH2CF3 and OCH2CCl3, were attached. 2-Mercaptoetha nol was bound via its thiolate function. The crystal structures of Tp( Cum,Me)Zn-OC6H4NO2-p, Tp(Cum,Me)Zn-OCH2-C6F5, Tp(Cum,Me)Zn-OCH2CF3, Tp (Cum,Me)Zn-OCH2CCl3 and Tp(Cum,Me)Zn-SCH2CH2OH were determined.