ADAMANTANOID CHELATE COMPLEXES .2. FORMATION OF TETRANUCLEAR CHELATE(4-) IONS OF DIVALENT METALS (MN, CO, NI) WITH IDEALIZED T SYMMETRY BY SPONTANEOUS SELF-ASSEMBLY

“Adamantoid” metal chelate complexes 1 can be obtained as ammonium salts by spontaneous self‐assembly from malonic esters, MeLi/MCI2, oxalyl chloride, and NH4Cl. The yields of this one‐pot synthesis lie between 80 and 87%. M signifies Mn, Co, Ni; the known Mg compound is even accessible in 90% yield via this route. The M‐cores are linked by chelate anions 2, which are formally formed by template coupling of malonic ester and oxalyl chloride. (Figure Presented.) Copyright © 1990 by VCH Verlagsgesellschaft mbH, Germany