Results of the Dirac-Slater discrete variational calculations are presented for the group 6 oxide tetrachlorides MOCl(4) (M = Mo, W, and element 106 Sg). Estimates of the bond strength have shown that the stability of SgOCl(4) toward thermal decomposition with respect to a loss of a chlorine atom is of the order of the stability of MoOCl4 losing chlorine at 25 degrees C. The estimated formation enthalpy of SgOCl(4) of -114 +/- 6 kcal/mol is less negative than those of the lighter homologs.