New hexacyclic binuclear tin complexes derived from bis-(3,5-di-tert-butyl-2-phenol)oxamide

The syntheses of bis-(3,5-di-tert-butyl-2-phenol)oxamide (2a) and four new hexacyclic bimetallic tin compounds derivatives are reported: bis-(3,5-di-t ert-butyl-2-oxo-phenyl)-oxamido-bis(dibutyltin) (3), bis-(3,5-di-tert-butyl -2-oxo-phenyl)-oxamido-bis(diphenyltin) (4), bis(triethylammonium) bis-(3,5 -di-tert-butyl-2-oxo-phenyl)-oxamido-bis-(dichlorobutyl-stannate) (5), and bis[(O-Sn) ethanol]-bis-(3, 5-di-tert-butyl-2-oxo-phenyl)-oxamido-bis-(chlo rophenyltin) (6). All tin compounds show a planar ligand skeleton in which each tin atom is linked to the phenoxy group, to the anilinic nitrogen atom and to the oxygen of the oxamide group. Compounds 3 and 4 have two pentaco ordinated diorganyl tin atoms with a distorted bpt geometry, whereas 5 cont ains a dianionic structure with two hexacoordinated tin atoms bonded to a n -butyl group and to two chlorine atoms and two triethyl ammonium as counter ions. Compound 6 has two hexacoordinated tin atoms, each atom is bonded, in addition to the ligand, to one phenyl and one chlorine and coordinated to an ethanol molecule. Characterization of the compounds was made through usu al analytical and spectroscopic methods. Structures of 4,6-di-tert-butyl-1- phenol-2-amine 1, the oxamide 2a and the four tin compounds 3-6 were establ ished by the X-ray diffraction analyses. (C) 2000 Elsevier Science B.V. All rights reserved.