SUBSTITUTIONS OF COORDINATED SALICYLALDEHYDE AND ITS SCHIFF-BASES

Several bis/tris-salicylaldehyde, salicylaldimine and salicyalethylene diimine chelates of cobalt(III), chromium(III), cobalt(II), nickel(II) and copper(II) readily react with various brominating agents and unde rgo alpha-bromo/cyano/succinimido substitution, with or without accomp anying bromine substitution of the aryl ring. The selectivity of these reactions on the metal-coordinated salicylaldehyde derivatives allows the preparation in 50-80% yield of hitherto unreported specific alpha -bromo products. The substituted organic compounds could be isolated b y demetallation of the chelate products.