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Synthesis and characterization of six new Schiff's bases, potential hexadentate ligands, containing amide groups and pyridine rings with shallow structures are described. The two step reactions involving ring opening of isatoic anhydride with diamines followed by condensation with pyridine aldehydes proceed smoothly to give Schiff's bases containing pyridine rings in high purity and better yields.

Complexes of iron(III), ruthenium(III) and rhodium(III) with three new tetraaza macrocyclic ligands, oxo4bzo3[14]triene-N4 [TBTAC14Tone], oxo4bzo2[14]diene-N4 [DBTAC14Tone] and oxo4bzo2[15]diene-N4 [DBTAC15Tone] have been prepared and characterised. The complexes are found to have the formulae [FeLCl2]Cl. 2H2O, [RuLCl2]Cl. 3H2O and [RhLCl2]Cl. 2H2O. The cations adopt a trans-dichloro configuration with the six-coordinated trivalent metal ions in a pseudo-octahedral geometry.

As part of our• program on the synthesis of antiradiation drugs we set out to prepare two short-chain aminooxyalkanethiols, H2NO(CH2)"SH ( = 2 or 3). Pre-(1) Presented at the 148th National Meeting of the American Chemical Society, Chicago, 111., Sept. 1964.(2) This project was sponsored by the office of the Surgeon General, U. S. Army Medical Research and Development Command (Contract DA-49-193-M D-2047), whose generous support is gratefully acknowledged.

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