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An isolobal analogy exists between the radicals TcO3, ReO3, and CH3, but not between MnO3 and CH3, according to ab initio SCF calculations. Consequently, compounds containing RTcO3 and RReO3 groups (where R is an organic or inorganic residue) should be stable. These results confirm calculations based on CpMO3 (1), which predict positive force constants for M [DOUBLE BOND] Tc or Re, but repulsion in the case M = Mn.