Halogens Group sulfur compounds with

Paritosh, D. R. et al Chem. Abs., 1994, 121, 35869j U.S. Pat. Appl. 42,229 Paritosh, D. R. etal., Phosphorus, Sulfur, Silicon Relat. Elem., 1994, 90(1-4), 175 This and several other compounds with fewer nitro groups and partial replacement of the spiro rings by halogen are patented as explosives. 

Native copper has a distinctive reddish/brown color. Its first oxidation state (+1) forms compounds with copper ions named cuprous, also referred to as copper(I), and these ions are easily oxidized with elements in group 16 (e.g., oxygen and sulfur) and elements in group 17 (the halogens). 

Returning to the statistics for dipole moment in Table 6.8, the group of 265 compounds containing oxygen (but no other heteroatom except halogen) shows the lowest correlations between the semiempirical methods and B3LYP (AMI R2 = 0.776, PM3 R2 = 0.701, PM5 R2 = 0.726) except for PM5 with a still slightly lower R2 value for the 42 compounds with phosphorus or sulfur atoms or both (0.716). Moreover, with both AMI and PM3 the 276 non-aromatic compounds yield lower correlation coefficients than the 331 aromatic compounds (AMI 0.763 vs. 0.859, PM3 0.731 vs. 0.801). 

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