Tetrabenzo tetraazacyclohexadecine zinc II Tetrachlorozincate

A mixture of 42 g (0.308 mole) of anhydrous zinc chloride and 28.5 g (0.236 mole) of freshly prepared dry o-aminobenzaldehyde is stirred for 4 days in 250 mL of anhydrous diethyl ether in a 500-mL stoppered Erlenmeyer flask equipped with a large magnetic stirring bar. The bright-yellow solid is removed from the diethyl ether by filtration and is air dried. This product is stirred for 30 

This square planar zinc complex is an excellent intermediate for the preparation of other BZO4 [16] octaene N4 complexes by metal exchange, and its use alleviates the problem of separating the desired complex from other reaction side products when o-aminobenzaldehyde is condensed in the presence of the appropriate metal ion. Complexes of nickel, cobalt, iron, and palladium have been prepared from this zinc compound. 

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