No abstract

Abstract. The synthesis of a new Costa-type ligand (H,mdo), in which the propylene bridge has been replaced by a methylenedioxy bridge has been accomplished: two molecules of butanedione monoxime are coupled via a CH, group by reaction with CH,C1, and 50% aqueous NaOH in the presence of a phase-transfer reagent. Dihalidocobalt and alkyl(ha1ido)cobalt complexes of the deprotonated ligand have been prepared and structurally characterized by NMR spectroscopy.